Android Intent

1. make a app as browser, register in AndroidManifest.xml

<intent-filter>
                <action android:name="android.intent.action.VIEW"/>
                <category android:name="android.intent.category.BROWSABLE"/>
                <category android:name="andoid.intent.category.DEFAULT" />
                <data android:scheme="http"/>
            </intent-filter>

http://blog.vogella.com/2011/02/21/android-intents/               Registering for Android Intents – Being a crappy browser

2. start another activity

Intent intent = null;
intent = new Intent(CurrentActivity.this, AnotherActivity.class);
startActivity(intent);

3. start activity for result

static private final int GET_TEXT_REQUEST_CODE = 1;// TODO - Start an Activity using that intent and the request code defined above

Intent explicitIntent = new Intent(CurrentActivity.this,AnotherActivity.class); 

startActivityForResult(explicitIntent, GET_TEXT_REQUEST_CODE);

this method onActivityResult() will be called after AnotherActivity return(finish)

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data)

 in AnotherActivity: set result and finish

Intent intent = new Intent();
intent.putExtra("hello", input);
this.setResult(RESULT_OK, intent);
finish();

4. create chooser, let user select from a list of app to handle this request

Intent baseIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("http://www.google.com"));

Intent chooserIntent = Intent.createChooser(baseIntent, CHOOSER_TEXT);

startActivity(chooserIntent);

5. start another application

　　in current application

startActivity(new Intent("course.labs.permissions.DANGEROUS_ACTIVITY"));

　　in another application's AndroidManifest.xml

<intent-filter>
                <action android:name="course.labs.permissions.DANGEROUS_ACTIVITY" />

                <category android:name="android.intent.category.DEFAULT" />
</intent-filter>