I have developed an app for page navigation . when a button is clicked the page should navigate to the second page. when i run the project and opened my app its showing unfortunately API demo has stopped. I have posted the entire code of my app . PLS HELP ME OUT...
//MAIN ACTIVITY
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="#+id/textView1"
android:layout_marginLeft="73dp"
android:layout_marginTop="14dp"
android:text="Click" />
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/button1"
android:layout_alignParentTop="true"
android:layout_marginLeft="14dp"
android:layout_marginTop="34dp"
android:text="Main Activity" />
</RelativeLayout>
//SECONDSCREEN ACTIVITY
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Sceond Screen Activity"
tools:context=".SecondScreenActivity"/>
</LinearLayout>
//JAVA CODE FOR MAIN ACTIVITY
package com.example.navigate;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addButtonOnClickEventListener();
}
public void addButtonOnClickEventListener()
{
Button button = (Button)findViewById(R.id.button1);
final Context context = this;
button.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(context,SecondScreenActivity.class);
startActivity(intent);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
// JAVA CODE FOR SECOND SCREEN ACTIVITY
package com.example.navigate;
import android.app.Activity;
public class SecondScreenActivity extends Activity {
}
// MANIFEST FILE
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.navigate"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.navigate.SecondScreenActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name = "android.intent.action.MAIN"/>
<category android:name = "android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
</manifest>
First problem MainActivity is your launcher page here but you define the secondactivity as luncher in manifest.change it first.
Add an oncreate() to secondactivity otherwise there is nothing to show when the button click.
Third change your MainActivity Context to activity which is MainActivity.this not local
Other things are fine , and hope you understand your small problems..
Change your manifest to something like this:
// MANIFEST FILE
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.navigate.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name = "android.intent.action.MAIN"/>
<category android:name = "android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<activity android:name = ".SecondScreenActivity" />
</application>
And in your SecondScreenActivity add an oncreate method with the contet view like:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.secondactivity_layout);
}
And also in your mainactivity change the context to MainActivity.this . Here you define the context inside onclicklistener which links to your local method not the class.
Related
When pressing the button, new activity should open but app instantly crashes. I have searched for answer and making a few adjustments to my code and only thing i dont know how to do is Manifest, can u help me with that?
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="Starting.Programm"
android:versionCode="1"
android:versionName="1.0">
<application android:label="#string/app_name"
android:icon="#drawable/ic_launcher">
<activity android:name="MainActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="InformationActivity"
android:label="#string/app_name"
>
</activity>
</application>
MainActivity:
package Starting.Programm;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
public class MainActivity extends InformationActivity
{
/** Called when the activity is first created. */
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void startJourney(View view) {
Intent intent = new Intent(this, InformationActivity.class);
startActivity(intent);
}
}
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
>
<Button android:id="#+id/button_StartApp"
android:layout_width="100dp"
android:layout_height="60dp"
android:text="#string/button_StartApp"
android:layout_gravity="center"
android:layout_marginTop="70dp"
android:layout_marginLeft="115dp"
android:onClick="startJourney"
/>
</LinearLayout>
And next activity which should be opening
package Starting.Programm;
import android.app.Activity;
import android.os.Bundle;
class InformationActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.information);
}
}
<activity> android:name=".InformationActivity" </activity>
Remove android:label="#string/app_name" too. I don't think it is needed.
Add dot to end of pacakager name
package="Starting.Programm."
I just wanted to click on a button in the MainActivity. After I clicked on this button a new activity appears. In this activity is also a button and when I click on this button a text appears. My Problem now is, that the text doesn't appear, when I click on the button. My code for clicking on a button so that a text appears is actually working. But not if I use it in a new Activity/Layout/ page. So there must be s.th. wrong with the Connection between the first and the second activity?!
MainActivity.java:
package com.example.xxx;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
public class MainActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;}
{}
public void page2 (View view){
setContentView(R.layout.pagetwo);
}}
activity_main.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="#+id/BtnKlick"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_marginTop="178dp"
android:text="Button"
android:onClick="page2"/>
</RelativeLayout>
Pagetwo.java:
package com.example.xxx;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class Pagetwo extends Activity implements OnClickListener {
public Button btn1;
public TextView tw1;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.pagetwo);
btn1 = (Button) findViewById(R.id.BtnKlick);
tw1 = (TextView) findViewById(R.id.Text);
btn1.setOnClickListener(this);
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
tw1.setText("Hallo");
}}
pagetwo.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<Button
android:id="#+id/BtnKlick"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="Klick" />
<TextView
android:id="#+id/Text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="87dp" />
</RelativeLayout>
AndroidManifest.xml:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.xxx"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.xxx.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
Update
All you seem to be doing is swapping your layouts within PageOne activity.
Change
public void page2 (View view){
setContentView(R.layout.pagetwo);
}
to
public void page2 (View view){
Intent i = new Intent(this, Pagetwo.class);
startActivity(i);
}
This will actually launch your pagetwo activity rather than just swapping layouts within pageone activity
Make that change and all should be good. You will most likely have to add some imports, at least for the intent class
Also Activities must be registered in the manifest. To add the activity to your manifest check the code below
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.xxx.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="Pagetwo"
android:label="#string/app_name" >
</activity>
</application>
Change the label to something more appropriate than app name once you have it working
End update
Try renaming your xml view id's to meet coding standards by using all lower case letters and separating words with underscores. The Android platform may well be getting confused as Text is a reserved word.
so
<TextView
android:id="#+id/Text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="71dp"
android:textSize="70sp" />
becomes
<TextView
android:id="#+id/tv_hallo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="71dp"
android:textSize="70sp" />
and your code becomes
...
public TextView tw;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.eclipse);
btn = (Button) findViewById(R.id.BtnKlick);
tw = (TextView) findViewById(R.id.tv_hallo);
btn.setOnClickListener(this);
}
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
tw.setText("Hallo");
}
...
Not sure if this is going to have much of an effect but it is just possible android is getting the word Text confused
Also check your logcat output to see if there are any errors.
My Application name is timepass
The below file is MainActivity.java
package com.example.timepass;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity
{
int counter;
Button add, sub;
TextView Display;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
counter=0;
add= (Button) findViewById(R.id.badd);
sub=(Button) findViewById(R.id.bsub);
Display=(TextView) findViewById(R.id.tvdisplay);
add.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
counter++;
Display.setText("Your total is " + counter);
}
});
sub.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
counter--;
Display.setText("Your total is " + counter);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
The below file is activity_main.xml which is realted to the above file MainActivity.java
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity"
android:background="#drawable/pic_two">"
<Button
android:id="#+id/badd"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/tvdisplay"
android:layout_alignTop="#+id/bsub"
android:text="#string/but1"
android:textSize="20sp" />
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/tvdisplay"
android:layout_alignRight="#+id/tvdisplay"
android:text="#string/hello_world"
android:textSize="#dimen/asa" />
<TextView
android:id="#+id/tvdisplay"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/textView2"
android:layout_centerHorizontal="true"
android:layout_marginTop="42dp"
android:gravity="center"
android:text="#string/str1"
android:textColor="#layout/activity_main"
android:textSize="30sp" />
<Button
android:id="#+id/bsub"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignRight="#+id/tvdisplay"
android:layout_below="#+id/tvdisplay"
android:layout_marginRight="38dp"
android:layout_marginTop="23dp"
android:text="#string/but2"
android:textSize="20sp" />
</RelativeLayout>
Then I have created another activity which is below which is Splash.java
package com.example.timepass;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
public class Splash extends Activity
{
#Override
protected void onCreate(Bundle tpsavedInstanceState)
{
// TODO Auto-generated method stub
super.onCreate(tpsavedInstanceState);
setContentView(R.layout.splash);
Thread timer =new Thread()
{
public void run()
{
try
{
sleep(5000);
}
catch(InterruptedException e)
{ {
e.printStackTrace();
}
finally
{
Intent openMainActivity =new Intent("com.example.timepass.MAINACTIVITY");
startActivity(openMainActivity);
}
}
};
timer.start();
}
}
Then I have created Xml file related to Splash.java which is splash.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#drawable/pic_background">
</LinearLayout>
NOW I WANT TO RUN FIRST Splash.java file then MainActivity.java file so I have make some changes in Androidmanifest.xml file
here are the changes, and after running my program I get error "Unfortunately timepass has stopped" where timepass is my app name . please solve this issue
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.timepass"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.timepass.Splash"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.timepass.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.example.timepass.MAINACTIVITY" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
//just do it like this
Intent openMainActivity =new Intent(this,MainActivity.class);
startActivity(openMainActivity);
instead of
Intent openMainActivity =new Intent("com.example.timepass.MAINACTIVITY");
startActivity(openMainActivity);
MainActivity in your manifest is used in two places. In one place it is in fully capital letter. Change that and give a try
You have an extra { before e.printStackTrace(); in your Splash.java. Remove that and you'll be good to go.
Also post log for furthur errors in the future
I have edited your AndroidManifest.xml update your code after your application work properly.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.timepass"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.timepass.Splash"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.timepass.MainActivity"
android:label="#string/app_name" >
</activity>
</application>
</manifest>
change your code in splash.java
Intent i = new Intent(splash.this, MainActivity.class);
startActivity(i);
Here I done code for 5 buttons like Aboutus,development,carriers,services,contactus.
Here I clicked about us button that shows errors as unfortunately app closed.
Here is my code :
MainActivity.java
public class MainActivity extends Activity {
Button aboutus,development,service,carriers,contactus;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button aboutus=(Button) findViewById(R.id.aboutus);
aboutus.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(v.getContext(),aboutus.class);
startActivity(i);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="#+id/aboutus"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="About us"
/>
<Button
android:id="#+id/services"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Services"
/>
<Button
android:id="#+id/development"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Development"
/>
<Button
android:id="#+id/carriers"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Carriers"
/>
<Button
android:id="#+id/contactus"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Contact Us"
/>
</LinearLayout>
</RelativeLayout>
aboutus.java
public class aboutus extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.aboutus);
}
}
aboutus.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:text="Aboutus Page"/>
</LinearLayout>
AndroidManifest.xml is this correct ?
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.globalinfosoft"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.globalinfosoft.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<Activity android:name= "aboutus"/>
</application>
</manifest>
MainActivity.java
package com.example.a;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.View;
import android.widget.Button;
public class MainActivity extends Activity {
Button aboutus, development, service, carriers, contactus;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button aboutus = (Button) findViewById(R.id.aboutus);
aboutus.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
//Starting a new Intent
Intent nextScreen = new Intent(getApplicationContext(),aboutus.class);
startActivity(nextScreen);
}
});
}
}
Here is Androidmanifest.xml :
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.a"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="18" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.a.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.example.a.aboutus"></activity>
</application>
</manifest>
Instead of v.getContext() use 'getApplicationContext()'.
Intent i = new Intent(getApplicationContext(),aboutus.class);
startActivity(i);
Try this ..
Button aboutus=(Button) findViewById(R.id.aboutus);
aboutus.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(getApplicationContext(),aboutus.class);
startActivity(i);
}
});
First, you should make sure that you have declared the aboutus acitivity in your AndroidManifest.xml file.
<Activity android:name= "aboutus"/>
Second, you can use
Intent i = new Intent(getApplicationContext(),aboutus.class);
or
Intent i = new Intent(MainActivity.this,aboutus.class);
instead of
Intent i = new Intent(v.getContext(),aboutus.class);
Intent i = new Intent(v.getContext(),aboutus.class);
startActivity(i);
instead of code use following code and instruction:
Intent i = new Intent(MainActivity.this,aboutus.class);
startActivity(i);
you have to declare the About us activity on AndroidManifest.xml like this
<Activity android:name= ".aboutus"/>
edit: The problem was trying to display the dialog and finish() the activity the next line, so there was no view for the dialog to show! Would be easier if I could just set home-screen as the context for the dialog.
Newbie here. I know this question has been asked for many times, but there's no full picture on the solution so far. I first started to run some code without GUI, which is successful by simply setting the theme. Now, I want to add dialog to display error from the code, but I cannot get it to show!
<activity android:name="PopupActivity"
android:launchMode="singleInstance" android:excludeFromRecents="true"
android:taskAffinity="" android:theme="#android:style/Theme.Dialog" />
So I created an empty view with wrap_content as width and height, but I'm not sure what view element I should use for the AlertDialog object in the activity. I have tested all my code in another activity with a view, everything works fine, AlertDialog shows without problem.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center_horizontal">
</LinearLayout>
Is there a simple solution? Or I have to treat the Theme.Dialog view as a normal view and add textview and button to emulate a dialog?
I use AlertDialog.Builder for the dialog creation:
AlertDialog.Builder alertDialogB = new AlertDialog.Builder(cont);
alertDialogB.setTitle(title);
alertDialogB.setMessage(msg);
...
...
IDE: IntelliJ
SDK: 4.1.2
You can create simple dialog with different solutions but I used this for starts with.
Here I am adding list of files with code to clarify your doubts:
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.demo"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.demo.LoginActivity"
android:label="#string/app_name"
android:launchMode="singleInstance">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name="com.demo.HomeActivity"
android:label="#string/title_activity_home"
android:theme="#android:style/Theme.Dialog">
</activity>
</application>
</manifest>
LoginActivity.java
package com.demo;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.app.Activity;
public class LoginActivity extends Activity {
Button login_btn;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
login_btn=(Button) findViewById(R.id.btnlogin);
login_btn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i=new Intent(getApplicationContext(),HomeActivity.class);
startActivity(i);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_login, menu);
return true;
}
}
activity_login.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".LoginActivity"
android:layout_gravity="center">
<Button
android:id="#+id/btnlogin"
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Login"/>
</LinearLayout>
And one activity which comes as a alert dialog for Login Activity
HomeActivity.java
package com.demo;
import android.os.Bundle;
import android.app.Activity;
import android.util.Log;
import android.view.Menu;
public class HomeActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_home, menu);
return true;
}
}
activity_home.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".HomeActivity"
android:orientation="vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="#string/hello_world" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
Not sure I got your question right, but you use an activity for the AlertDialog.Builder(getActivity);
And then just Dialog dialog = builder.create();
dialog.show();