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();
Related
Hi I have a basic app for logging in with hardcoded credentials, and I want it to take you to another activity called Welcome. Here is my main activity:
package com.example.numericlogin;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.os.Build;
public class MainActivity extends Activity{
private EditText login_key=null;
private Button login=null;
#Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
login_key = (EditText)findViewById(R.id.editText1);
login = (Button)findViewById(R.id.login);
}
public void login(View view){
if(login_key.getText().toString().equals("123456")){
Toast.makeText(getApplicationContext(), "Login Successful!",
Toast.LENGTH_LONG).show();
startActivity(new Intent(MainActivity.this,Welcome.class));
}
else{
Toast.makeText(getApplicationContext(), "Wrong Credentials",
Toast.LENGTH_SHORT).show();
{
login.setEnabled(false);
}
}
}
#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;
}
}
Here is the main activity's 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="com.example.numericlogin.MainActivity$PlaceholderFragment" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/login_key" />
<EditText
android:id="#+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignTop="#+id/textView1"
android:ems="10"
android:digits="0123456789"
android:inputType="number|textPassword"
android:maxLength="6"
android:password="true"
/>
<Button
android:id="#+id/login"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/editText1"
android:layout_centerHorizontal="true"
android:layout_marginTop="70dp"
android:text="#string/login" />
</RelativeLayout>
Here is the second activity I want it to switch to when logged in correctly:
package com.example.numericlogin;
import android.view.View;
import android.widget.ImageView;
public class Welcome {
public void welcome(View v){
ImageView picture = (ImageView)
setContenView(R.layout.fragment_main);
}
private ImageView setContenView(int fragmentMain) {
// TODO Auto-generated method stub
return null;
}
}
Here is the xml for the above activity:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="74dp"
android:src="#drawable/welcome" />
</RelativeLayout>
And here is the manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.numericlogin"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="10"
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.example.numericlogin.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=".Welcome"/>
</application>
</manifest>
At the moment when I launch it it brings up the first activity and allows you to enter input in the login area, but when you click the login button nothing happens. There are no errors in the code and here is the logcat output:
07-01 14:11:15.313: W/IInputConnectionWrapper(23128): showStatusIcon on inactive InputConnection
This is how you switch between activities:
In MainActivity.java:
Intent go = new Intent(this, Welcome.class);
startActivity(go);
Your second activity class must extend Activity
public class Welcome extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.childact);
}
}
And you must register all activities in manifest file.
You are missing this:
<activity
android:name="com.example.testingproj.Welcome"
android:label="#string/app_name">
</activity>
I think you forgot set onClickListener for the login button or set attribute onClick with value 'login' in the properties panel in graphical layout preview.
final Button login= (Button) findViewById(R.id.login);
button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform code validation
}
});
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.
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.
I'm just trying to come up with a skeleton for an activity that uses a ListView as a news feed for a game my class is making.
In this activity there's simply the news feed, and a Refresh button (to update the ListView with the latest news)
My activity_news.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_gravity="center">
<ListView
android:id="#+id/news"
android:layout_width="match_parent"
android:layout_height="320dp"
>
</ListView>
<Button
android:layout_width="fill_parent"
android:layout_height="45dp"
android:text="Refresh"
android:id="#+id/bRef"
/>
My NewsActivty.java:
package com.example.mynews;
import com.example.mynews.R;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
public class NewsActivity extends Activity {
Button refresh;
String newsfeed [] = {"latest news", "older news"};
Intent ref = new Intent(this, NewsActivity.class);
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_news);
refresh = (Button) findViewById(R.id.bRef);
ListView newsStuff = (ListView) findViewById(R.id.news);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, newsfeed);
newsStuff.setAdapter(adapter);
refresh.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
startActivity(ref);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.news, menu);
return true;
}
}
And my manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.mynews"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
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.example.mynews.NewsActivity"
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>
I built everything up piece by piece and ran it as I finished something new (the layout, the array adapter, etc) and the activity started to break once I added the OnClickListener (emulator tells me "mynews has unfortunately stopped") for my Refresh button. I'm sure there's a better way to accomplish what i'm trying to do, but any assistance with what I have so far would be greatly appreciated.
Did u define a class ref.java?
if yes then you need define that activity(ref) in the manifest file.
I am new to android development. After setting up an android project, I tried to get text input and passe it to another activity (screen).
When I run the project I don't get an error but when I click the application it shows the first screen then when click the button in the screen it gives the error 'application stopped unexpectedly'.
When I try the code without passing data from first screen to second screen , the application works properly.
This is MainActivity.java file:
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText et= (EditText) findViewById(R.id.editText1);
Button b = (Button)findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
//intent class is used for activating another or component or an activity
Intent intent =new Intent(MainActivity.this, Second.class);
intent.putExtra("textval", et.getText().toString());
startActivity(intent);
}
});}}
Here is the code for Second.java file:
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class Second extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
TextView tv= (TextView) findViewById(R.id.textView1);
tv.setText(getIntent().getExtras().getString("textval"));
}
}
Here is the activitymain.xml code:
<?xml version="1.0" encoding="UTF-8"?>
<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">
<EditText android:id="#+id/editText1" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_alignParentLeft="true"
android:layout_alignParentRight="true" android:layout_alignParentTop="true"
android:ems="10"
android:inputType="text"
>
<requestFocus />
</EditText>
<Button android:id="#+id/button1" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:layout_alignParentLeft="true"
android:layout_below="#+id/editText1" android:layout_marginTop="28dp"
android:text="#string/button" />
</RelativeLayout>
Here is the second xml file:
<?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:id="#+id/textView1" android:layout_width="wrap_content"
android:layout_height="wrap_content" android:text="#string/textview" />
</LinearLayout>
Please help me to find the error. Since I don't get an error notification I am not able to proceed.
Thanks in advance...
This is what you missed on your Second.java:
setContentView(R.layout.second);
put it above of your textview declaration.
In your Second java file make changes as follows
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class Second extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
TextView tv= (TextView) findViewById(R.id.textView1);
tv.setText(getIntent().getExtras().getString("textval"));
}
}
Declare Second Activity in android manifest file .
<activity android:name=".Second"/>
Add setContentView(R.layout.second); in second activity.
Add entry for second activity in your Manifest file.
Put first activity as a Launcher and other as a Default.
Here I have two activity MainActivity and Player.
First I Launches MainActivity and then call other activity Player
Note- Activity name should be same as class name, so Keep same in Manifest file as well.
Also you need to specify the layout file for both activity by setContentView in onCreate function.
Here is sample code-
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.vt.soc"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/title_activity_main" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Player"
android:label="#string/title_activity_main" >
<intent-filter>
<action android:name="com.vt.soc.PALYER" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
- In your Second Activity you forgot to add the setContentView().
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.second);
TextView tv= (TextView) findViewById(R.id.textView1);
tv.setText(getIntent().getExtras().getString("textval"));
}
- Please also do see that you have added this Second Activity in your Manifest.xml file.