So I was trying to work on graphics and wanted to use intent to switch between activities and its not the first time I am doing it but I really cannot find the error. So I am posting the code for my mainactivity and manifest here. Please tell me the cause of the problem
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//fullscreen
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
Button b1 = (Button) findViewById(R.id.button1);
b1.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent p = new Intent("com.example.menuinflater.GFX");
startActivity(p);
}
});
}
and Manifest looks something like this:
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<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=".About"
android:label="#string/title_activity_about"
android:theme="#android:style/Theme.Dialog" >
<intent-filter>
<action android:name="android.intent.action.About" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".Prefs"
android:label="#string/title_activity_about" >
<intent-filter>
<action android:name="android.intent.action.Prefs" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".GFX"
android:label="#string/title_activity_gfx" >
</activity>
</application>
I hope that makes clear where am I going wrong and I would want an answer with explanation. I would highly appreciate any solution.
Thanks in advance!
I suggest reading the basic training pages on developer.android.com, they contain alot of basic and useful information.
About your specific problem, this link ought to help: http://developer.android.com/training/basics/firstapp/starting-activity.html
The intent should be like this:
Intent p = new Intent(this, GFX.class);
Related
So when this code runs I get no errors. It displays the buttons correctly and everything, but when I click on the button nothing happens (it just clicks and clicks and clicks nothing happens).
Below I will post the xml manifest so you can see that I have done everything perfectly, but somehow it it is not doing what I am asking it to do.
package com.Tripp.thebasics;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class Menu extends Activity{
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.jokecatagories);
//setting up the button references
Button jokeD = (Button) findViewById(R.id.jokeoftheday);
Button jokeC = (Button) findViewById(R.id.jokecatagories);
jokeD.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent i = new Intent(getApplicationContext(),JokeOfTheDay.class);
startActivity(i);
}
});
jokeC.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent s = new Intent(".JokeCatagories");
startActivity(s);
}
});
}
#Override
protected void onPause() {
// TODO Auto-generated method stub
super.onPause();
}
}
The manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.Tripp.thebasics"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="15"
android:targetSdkVersion="21" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme"
>
<activity
android:name=".Main"
android:label="#string/app_name"
android:screenOrientation="portrait"
>
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Menu"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MENU" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".com.Tripp.thebasics.JokeCatagories"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.JOKECATAGORIES" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".Sweet"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.SWEET" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:name=".com.Tripp.thebasics.JokeOfTheDay"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.JOKEOFTHEDAY" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
Change your OnClickListeners as follows...
jokeD.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(Menu.this, JokeOfTheDay.class);
startActivity(i);
}
});
jokeC.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent s = new Intent(Menu.this, JokeCatagories.class);
startActivity(s);
}
});
Then get rid of this <intent-filter> from the JokeCategories <activity> section in the manifest...
<intent-filter>
<action android:name="android.intent.action.JOKECATAGORIES" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
...and get rid of this one from the JokeOfTheDay <activity> section...
<intent-filter>
<action android:name="android.intent.action.JOKEOFTHEDAY" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
Basically, don't use the application Context to start an Activity (it's not necessary from an Activity as it has its own Context) and, on the whole, use explicit Intents to start Activities rather than defining <intent-filter> section in the manifest.
I have created a splash activity for my app. I am trying to redirect from my Splash activity to the Starting Point activity using AndroidManifest.xml but its not working. The Splash class loads up, and then it doesn't redirect to the Starting Point. And it doesn't give any errors either.
So can you please help me figure it out.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapp"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.example.myapp.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.myapp.StartingPoint"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.example.myapp.STARTINGPOINT" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
Now I have also tried
<activity
android:name=".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=".StartingPoint"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.example.myapp.STARTINGPOINT" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
So what can I do here. I am not getting redirected from Splash to my Starting Point.
Splash Code
package com.example.myapp;
import android.app.Activity;
import android.os.Bundle;
public class Splash extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.splash);
}
}
Add this code to your Splash.java
Thread timer = new Thread(){
public void run(){
try {
sleep(2000);
} catch (Exception e) {
// TODO: handle exception
} finally{
Intent i = new Intent(Flash_Activity.this, StartingPoint.class);
startActivity(i);
}
}
};
timer.start();
}
You are never calling anything to change the activity from your splash to the starting point. This thread will do that.
Use this easy way to redirect to acitvity
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
Intent intent = new Intent(this,MainActivity.class);
startActivity(intent);
finish();
}
},2500);
I was trying to get a small image to show up before my Main Activity starts. This is my current coding in the android manifest
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name=".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=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="com.example.test.MAINACTIVITY" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
whatever I do, my splash screen does not start. They start separately, but never together, (I still haven't put a timer in my splash image as I want to check whether it works or not and it isn't working)
Remove
<intent-filter>
<action android:name="com.example.test.MAINACTIVITY" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
Use below code in splash screen after desired time
Intent intent=new Intent(this,MAINACTIVITY.class);
startActivity(intent);
finish(); //To close splashscreen when MAINACTIVITY loads
The above code starts with splash screen and after some time start your main activity
You should remove the <intent-filter> section from your MainActivity declaration ,
and launch the MainActivity from the splashActivity using a simple intent and startActivity call.
Try this.
<activity
android:name=".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=".MainActivity" >
</activity>
</application>
Code for your Splash Class-
package com.example.test;
import android.app.Activity;
import android.os.Bundle;
public class Splash extends Activity
{
#Override
protected void onCreate(Bundle savedInstanceState)
{ // TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.splash);
final Handler handle = new Handler();
Runnable delay = new Runnable() {
public void run() {
startActivity(new Intent(Splash.this, MainActivity.class));
finish();
}
};
handle.postDelayed(delay,5000);
}
}
its delay next intent 5 second. you can set time according to you.
Use This:
<activity
android:name=".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=".MainActivity" >
</activity>
</application>
and This :
public class Splash extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.splash);
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
public void run() {
Intent mInHome = new Intent(Splash.this, MainActivity.class);
Splash.this.startActivity(mInHome);
Splash.this.finish();
}
}, 3000);
}
}
I'm feeling stupid.This is very clear but I can not solve my problem.So excuse me for my question.
My problem is in about intenfilter.This is application tag of my manifest file:
<application
android:icon="#drawable/ic_launcher"
android:label="#string/app_name" >
<activity
android:label="#string/app_name"
android:name=".AlakyTestActivity" >
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:label="reza"
android:name=".A2" >
<intent-filter >
<action android:name="MAIN" />
<category android:name="LAUNCHER" />
</intent-filter>
</activity>
</application>
And this is my button click listener:
b1 = (Button)findViewById(R.id.button1);
b1.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent2 = new Intent();
intent2.setAction("MAIN");
intent2.addCategory("LAUNCHER");
startActivity(intent2);
}
});
I think that all things is good but when I run my code and click on b1,I get this erroe:
android.content.ActivityNotFoundException: No Activity found to handle Intent { act=MAIN cat=[LAUNCHER] }
Edit:
This is A2:
public class A2 extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
this.setContentView(R.layout.main2);
}
}
Please help me.
You should set the android:name of the second activity to the (package name).(the class)
for example, lets say the second activity class is 'com.my.app.reza' you should add you the manifest:
<activity
android:label="#string/app_name"
android:name=".reza" >
<intent-filter >
<action android:name="com.my.app.REZA" />
<category android:name="android.intent.category.DEFUALT" />
</intent-filter>
</activity>
and you should start the activity like that:
Intent intent = new Intent("com.my.app.REZA");
startActivity(intent);
NOTE that it isn't the best way to do it, you shouldn't mess to much with package name I'd recommend you to do it the following way:
<activity
android:label="#string/app_name"
android:name=".reza" />
and start it like that:
startActivity(new Intent( this.getContext() , reza.class );
Please use like that:
Intent intent2 = new Intent(context,A2.class);
startActivity(intent2);
android:name=".A2" ,you must have "A2" activity class implement!
Modify to android:name=".A2", not android:name="A2"!
You don't need to specify category if you just need to call A2 inside your app. And you should set an unique action name, for example it can be a hash string:
...
Intent intent2 = new Intent("a202bfa923069ee8e119205e3468ee131ceafda37");
startActivity(intent2);
Note that action name uses same rule as package name.
<intent-filter>
<action android:name="com.blacky.basictutorial.TutorialTwo" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
Try to use this in your second activity and call by the following code:
startActivity(new Intent("com.blacky.basictutorial.TutorialTwo"));
Hope this will work for you.
07-18 04:48:22.465: E/AndroidRuntime(19105): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.liamwli.fa.yearbook/com.liamwli.fa.yearbook.Home}: java.lang.NullPointerException
That is the error I get.
I have defined the Home class in the manifest:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.liamwli.fa.yearbook"
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/app_name"
android:theme="#android:style/Theme.Holo" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Home"
android:label="#string/app_name"
android:theme="#android:style/Theme.Holo" >
<intent-filter>
<action android:name="com.liamwli.fa.yearbook.HOME" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
And it only started doing this when I added the putExtras line in my main activity:
enter.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
// TODO Auto-generated method stub
myname = name.getText().toString();
Intent i = new Intent("com.liamwli.fa.yearbook.HOME");
i.putExtra("myname", myname);
startActivity(i);
}
});
So, can anyone please explain what is happening?
use this:
Intent i = new Intent(context,otherActivity.class);
context of that activity from where you want to start activity.otherActivity is the name of activity which you want to start
Try this once
Intent i = new Intent(MainActivity.this,Home.class);
i.putExtra("myname", myname);
startActivity(i);
And I don't think this is required in Manifest
<intent-filter>
<action android:name="com.liamwli.fa.yearbook.HOME" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
change like this
Intent i = new Intent(MainActivity.this, Home.class);
i.putExtra("myname", myname);
startActivity(i);
Try this...
Intent i = new Intent( YourActivityName.this , otherActivity.class);
Ok, I looked and it looked like I was setting a variable contents outside of the onCreate method. So that is why it wasn't working.