Android - PendingIntent(2) - 3支apk當範例

現在模擬一下有三支APK，分別A1丟PendingIntent給A2，A2依接受到的PendingIntent而執行A3。因為 PendingIntent的機制，所以A2是動態決定要執行誰的，如果今天有另一支APK丟了指定要執行Broadcast的 PendingIntent給A2時，那A2就會執行廣播等待系統某一個Receiver去接受這個廣播。程式碼如下:

public class A1 extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        OnClickListener mListener = new OnClickListener() {
            public void onClick(View v) {

                Intent intent = new Intent("com.action.a3");
                intent.putExtra("Data", "Information from PendingIntent");

                PendingIntent mPendingIntent = PendingIntent.getActivity(
                        A1.this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);

                Intent intent2 = new Intent("com.action.a2");
                intent2.putExtra("Data", "Information from A1");

                // 因為PendingIntent類別有implements Parcelable，
                // 所以可以直接用puxExtra傳遞
                intent2.putExtra("myPendingIntent", mPendingIntent);
                startActivity(intent2);

            }
        };

        Button mButton = (Button) findViewById(R.id.Button01);
        mButton.setOnClickListener(mListener);
    }
}

AndroidManifest.xml如下
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.a1" android:versionCode="1" android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".A1" 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>


public class A2 extends Activity {
    public Intent mIntent;
    public PendingIntent mPendingIntent;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mIntent = getIntent();
        TextView txt = (TextView) findViewById(R.id.txt1);
        txt.setText(mIntent.getStringExtra("Data"));

        mPendingIntent = mIntent.getParcelableExtra("myPendingIntent");
        OnClickListener mListener = new OnClickListener() {
            public void onClick(View v) {
                if (mPendingIntent != null) {
                    try {
                        mPendingIntent.send();
                    } catch (CanceledException e) {
                        e.printStackTrace();
                    }
                }
            }
        };

        Button mButton = (Button) findViewById(R.id.Button01);
        mButton.setOnClickListener(mListener);
    }
}

AndroidManifest.xml如下:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.a2" android:versionCode="1" android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".A2" android:label="@string/app_name">
            <intent-filter>
                <action android:name="com.action.a2" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>
</manifest>

public class A3 extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Intent mIntent = getIntent();
        TextView txt = (TextView) findViewById(R.id.txt1);
        txt.setText(mIntent.getStringExtra("Data"));
    }
}

AndroidManifest.xml如下:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.a3" android:versionCode="1" android:versionName="1.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".A3" android:label="@string/app_name">
            <intent-filter>
                <action android:name="com.action.a3" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>
    </application>
</manifest> 

執行畫面如下: