Android BroadcastReceiver transmitió una explicación detallada

Hay dos formas de enviar la transmisión BroadcastReceiver :

    1、普通广播---接收方没有先后顺序
    2、有序广播---接收方有先后顺序，按照设置的顺序接收广播

BroadcastReceiver broadcast tiene dos métodos de registro:

    1、静态注册----在清单文件中注册
    2、动态注册----在程序中注册（动态注册的广播使用完一定要注销）

1. Registro estático - enviar transmisión ordinaria

 * 1、创建一个BroadcastReceiver的子类，重写onReceive()方法。

public class MyBroadcast2 extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        Toast.makeText(context, "广播2", Toast.LENGTH_SHORT).show();
    }

}

 * 2、在清单文件中注册广播
     意图过滤器的name属性用于广播接收的时候接收指定的广播，和ID类似

        <!-- 注册广播 -->
        <receiver android:name=".MyBroadcast" >
            <intent-filter> <!-- 添加意图过滤器 -->
                <action android:name="com.example.class_broadcastreceiver" />
            </intent-filter>
        </receiver>

 * 3、通过sendBroadcast(intent)发送广播

    Intent intent = new Intent();
    intent.setAction("com.example.class_broadcastreceiver");
    sendBroadcast(intent);// 发送广播

2. Registro estático - enviar transmisión ordenada

El procedimiento es el mismo que enviar una transmisión ordinaria, excepto que se agrega un atributo cuando se registra la transmisión en el archivo de manifiesto: cuanto mayor sea el valor establecido en android: priority = ”11”, mayor será la prioridad de recibir la transmisión primero. Los receptores de alta prioridad de transmisión ordenada pueden detener la propagación continua de la transmisión llamando al método abortBroadcast () en onReceive (). Después de llamar a este método en un receptor determinado, los receptores de baja prioridad no pueden recibirlo. Broadcast

  <receiver android:name=".MyBroadcast2" >
        <intent-filter android:priority="11" > <!-- 数值越大，越先接收广播 -->
             <action android:name="abc" />
        </intent-filter>
  </receiver>

Interrumpir la transmisión:

public class MyBroadcast extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        String name = intent.getStringExtra("name");
        System.out.println("---1->>" + name);
        abortBroadcast();// 终止当前广播
    }
}

3. Registro dinámico: cambios de monitoreo en la batería de Android

1、创建BroadcastReceiver的子类并且重写onReceive方法，在onReceive方法中可以进行一些接收到系统广播的逻辑操作，发送通知或者Toast但不建议弹出Dialog。

public class PowerBroadcastReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub
            if (intent.getAction().equals(Intent.ACTION_BATTERY_CHANGED)) {
                int level = intent.getIntExtra("level", 0);
                int scale = intent.getIntExtra("sacle", 100);
                textView.setText("当前手机电量为： " + (level * 100) / scale + "%");
            }
        }

    }

2、实例化BroadcastReceiver的子类，调用registerReceiver（）方法注册广播。

receiver = new PowerBroadcastReceiver();
        // 意图过滤器
        IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        // 注册接收
        registerReceiver(receiver, filter);

3、注销广播，调用unregisterReceiver()方法注销广播

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(receiver);// 注销广播
    }

动态注册的广播不再需要在清单文件中进行注册！监听手机电量变化需要在清单文件中申请权限：

 <uses-permission android:name="android.permission.BATTERY_STATS"/>

4. Registro estático: para realizar el inicio de la aplicación

1、清单文件中添加系统启动监听权限

<!-- 监听系统开机广播权限 -->
    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>

2、清单文件中注册广播

 <!-- 注册广播 -->
        <receiver android:name=".BootCompleteReceiver" >
            <intent-filter>
                <action android:name="android.intent.action.BOOT_COMPLETED" />
                <category android:name="android.intent.category.HOME" >
                </category>
            </intent-filter>
        </receiver>

3、创建BroadcastReceiver的子类并且重写onReceive方法，在onReceive方法中启动我们需要开机启动的Activity

public class BootCompleteReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        // TODO Auto-generated method stub
        Intent intent2 = new Intent(context, MainActivity.class);
        intent2.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent2);
    }
}

Código fuente de monitoreo de energía:

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends Activity {
    private TextView textView;
    private PowerBroadcastReceiver receiver;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView = (TextView) this.findViewById(R.id.textView1);
        receiver = new PowerBroadcastReceiver();
        // 意图过滤器
        IntentFilter filter = new IntentFilter(Intent.ACTION_BATTERY_CHANGED);
        // 注册接收
        registerReceiver(receiver, filter);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        unregisterReceiver(receiver);// 注销广播
    }

    public class PowerBroadcastReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO Auto-generated method stub
            if (intent.getAction().equals(Intent.ACTION_BATTERY_CHANGED)) {
                int level = intent.getIntExtra("level", 0);
                int scale = intent.getIntExtra("sacle", 100);
                textView.setText("当前手机电量为： " + (level * 100) / scale + "%");
            }
        }

    }
}

<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"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="141dp"
        android:text="TextView" />

</RelativeLayout>

Enlace: http://blog.csdn.net/q296264785/article/details/53445206