切换活动时，简单Droid App强制关闭

Question

I new to app development and I have been working on a Flash card app. There is a main screen and the user chooses a button. On the emulator when I touch a button to go to a new activity, my app force closes. I have added the activity in the manifest. The second activity has its own layout (main2.xml). My buttons look like this:

Button add = (Button) findViewById(R.id.add);
add.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Intent addIntent = new Intent(view.getContext(), Add.class);
        startActivity(addIntent);

    }
});

Any ideas of what's going wrong? If more info is needed I can supply it, I've been stuck here for two days. Thanks

Answer 1

Your activity in the manifest should look like this:

<activity android:name="ActivityClassName" 
          android:label="label"
    <intent-filter>
        <category
            android:name="android.intent.category.DEFAULT" />
        <action
            android:name="my.package.ACTIVITY_NAME" />
    </intent-filter>
</activity>

You then can start it like this:

Intent intent = new Intent("my.package.ACTIVITY_NAME");            
startActivity(intent);

To get more help post the manifest file and the exception you get, when the application crashes. You can see that in Eclipse's debug perspective, in the LogCat view.

Answer 2

you can not call startActivity on OnClickListener. you need to call it on your application context object or activity object.

Button add = (Button) findViewById(R.id.add);
Context ctx=this;
add.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Intent addIntent = new Intent(view.getContext(), Add.class);
        ctx.startActivity(addIntent);
    }
});