使用Broadcast实现Android组件间的通信

<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="@string/hello_world" />  <Button    android:id="@+id/button1"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:layout_alignLeft="@+id/textView1"    android:layout_marginLeft="27dp"    android:layout_marginTop="26dp"    android:text="发送广播" /></LinearLayout>

public class MainActivity extends Activity {  private Button btn;  private TextView tv;  @Override  protected void onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentView(R.layout.activity_main);    tv = (TextView) this.findViewById(R.id.textView1);    //接收广播    LocalBroadcastManager broadcastManager = LocalBroadcastManager        .getInstance(MainActivity.this);    IntentFilter intentFilter = new IntentFilter();    intentFilter.addAction("com.example.test1");    BroadcastReceiver mItemViewListClickReceiver = new BroadcastReceiver() {      @Override      public void onReceive(Context context, Intent intent) {        tv.setText("1111");      }    };    broadcastManager.registerReceiver(mItemViewListClickReceiver,        intentFilter);    btn = (Button) this.findViewById(R.id.button1);    btn.setOnClickListener(new OnClickListener() {      @Override      public void onClick(View v) {        //发送广播        Intent intent = new Intent("com.example.test1");        LocalBroadcastManager.getInstance(MainActivity.this)            .sendBroadcast(intent);      }    });  }}