android Broadcast demo

思路是构造两个activity一个activity设置为dialog主题，然后发送广播给另一个activity。

sendActivity：

public class sendBroadcast extends Activity {
	private Button sendButton = null;
	private EditText sendEditText = null;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_send);
		sendButton = (Button) findViewById(R.id.send_bt);
		sendEditText = (EditText) findViewById(R.id.send_et_content);
		sendButton.setOnClickListener(onClickListener);
	}

	android.view.View.OnClickListener onClickListener = new OnClickListener() {

		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			switch (v.getId()) {
			case R.id.send_bt:
				sendBroadcast(sendEditText.getText().toString());
				break;

			}
		}
	};

	/**
	 * 发送广播
	 * 
	 * @param string
	 */
	private void sendBroadcast(String string) {
		Intent intent = new Intent();
		Bundle bundle = new Bundle();
		bundle.putString("BroadcastContent", string);
		intent.putExtras(bundle);
		intent.setAction("Broadcast_Action");//给意图添加Action
		sendBroadcast.this.sendBroadcast(intent);
	}

}

 receiverActivity:

public class Receiver extends Activity {
private TextView showBroadcastContentTextView=null;
private Button showSendBroadcastActivityButton=null;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_receiver);
		showBroadcastContentTextView=(TextView)findViewById(R.id.receiver_tv_content);
		showSendBroadcastActivityButton=(Button)findViewById(R.id.receiver_bt_showsendbroadcast);
		showSendBroadcastActivityButton.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				// TODO Auto-generated method stub
				Intent intent=new Intent(Receiver.this,sendBroadcast.class);
				Receiver.this.startActivity(intent);
			}
		});
	}

//新建广播接收器，重写接受方法
	private BroadcastReceiver broadcastReceiver=new BroadcastReceiver() {
		
		@Override
		public void onReceive(Context context, Intent intent) {
			// TODO Auto-generated method stub
	//获取广播传递过来的数据，显示在textview中。
			String contentString=intent.getStringExtra("BroadcastContent");
			Toast.makeText(Receiver.this, contentString, Toast.LENGTH_LONG).show();
			showBroadcastContentTextView.setText(contentString);
		}
	};
	@Override
	protected void onResume() {//生成activity时添加意图拦截器，拦截广播并注册广播接收器
		// TODO Auto-generated method stub
		IntentFilter intentFilter=new IntentFilter();
		intentFilter.addAction("Broadcast_Action");
		registerReceiver(broadcastReceiver, intentFilter);
		super.onResume();
	}

	@Override
	protected void onDestroy() {
		// TODO Auto-generated method stub
		if (broadcastReceiver!=null) {
			unregisterReceiver(broadcastReceiver);//销毁时接触注册
		}
		super.onDestroy();
	}
	
}

 receiver_layout:

<RelativeLayout 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"
    tools:context=".Receiver" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:text="BroadCastReceiver"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <TextView
        android:id="@+id/receiver_tv_content"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignRight="@+id/textView1"
        android:layout_below="@+id/textView1"
        android:layout_marginRight="20dp"
        android:layout_marginTop="24dp"
       />

    <Button
        android:id="@+id/receiver_bt_showsendbroadcast"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_marginRight="30dp"
        android:text="ShowSendBroadcast" />

</RelativeLayout>

 send_layout:

<RelativeLayout 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"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="19dp"
        android:layout_marginTop="23dp"
        android:text="broadCast使用"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <EditText
        android:id="@+id/send_et_content"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/textView1"
        android:ems="10" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/send_bt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/textView1"
        android:layout_below="@+id/send_et_content"
        android:text="发送广播" />

</RelativeLayout>

 广播入门了。