自定义广播Broadcast

自定义广播的步骤有：注册，重写onReceiver()，发送广播。
自定义广播示例如下，此示例发送了无序，有序，本地广播以及有序广播resultReceiver的用法。
（1）注册广播 AndroidManifest.xml

<receiver android:name=".MyReceiver01">
<intent-filter android:priority="1000">
    <action android:name="com.nxyuntui.testproject.CUSTOM"/>
</intent-filter>
</receiver>

<receiver android:name=".MyReceiver02">
<intent-filter android:priority="500">
    <action android:name="com.nxyuntui.testproject.CUSTOM"/>
</intent-filter>
</receiver>

<receiver android:name=".MyReceiver03">
<intent-filter android:priority="0">
    <action android:name="com.nxyuntui.testproject.CUSTOM"/>
</intent-filter>
</receiver>

（2）布局xml中只有三个button

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">

<Button
    android:id="@+id/button1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="发送无序广播"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:onClick="click1"/>
<Button
    android:id="@+id/button2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="发送有序广播"
    android:onClick="click2"/>\
<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/localButton"
    android:text="发送本地广播"
    app:layout_constraintTop_toBottomOf="@+id/button2"
    />
</android.support.constraint.ConstraintLayout>

（3）MainActivity.java文件中定义了如何发送有序/无序/本地广播

public class MainActivity extends AppCompatActivity {
private IntentFilter intentFilter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    //获取本地广播管理者实例
    final LocalBroadcastManager localBroadcastManager = LocalBroadcastManager.getInstance(this);
    Button button = (Button) findViewById(R.id.localButton);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent = new Intent("com.nxyuntui.testproject.CUSTOM");
            localBroadcastManager.sendBroadcast(intent);   //发送本地广播
        }
    });
    intentFilter = new IntentFilter();
    intentFilter.addAction("com.nxyuntui.testproject.CUSTOM");
    LocalReceiver localReceiver = new LocalReceiver();
    localBroadcastManager.registerReceiver(localReceiver,intentFilter);     //注册本地广播接收器
}

@Override
protected void onDestroy() {
    super.onDestroy();

}

public void click1(View view){
    Log.i("MainActivity","无序广播");
    Intent intent = new Intent();
    intent.setAction("com.nxyuntui.testproject.CUSTOM");
    sendBroadcast(intent);   //发送无序广播
}

public void click2(View view){
    Log.i("MainActivity","有序广播");
    Intent intent = new Intent();
    intent.setAction("com.nxyuntui.testproject.CUSTOM");
    sendOrderedBroadcast(inten,null);      //发送有序广播
    sendOrderedBroadcast(intent,null,new FinalResultReceiver(),null,0,null,null);      //resultReceiver重载方法
}

class LocalReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context,"收到了本地广播",Toast.LENGTH_SHORT).show();
    }
 }
}

（4）MyReceiver01.java ,另外MyReceiver02和MyReceiver03一样继承BroadcastReceiver ，不过onReceive() 方法为空。

public class MyReceiver01 extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
    Log.i("MyReceiver01","MyReceiver01");
    abortBroadcast();
 }
}

（5）FinalResultReceiver.java 有序广播的另一个重载方法，指定结果的广播接收者，该广播必须是当前程序内部，不论前面有多少个广播接收者，或者广播中断，resultReceiver都能接收到广播，而且不需要注册。

public class FinalResultReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
    Log.i("FinalResultReceiver","最终广播");
 }
}

（6）本地广播
此类型的广播只能够在应用程序的内部进行传递，并且广播接收器只能接收来自本应用程序发出的广播，避免某些安全隐患。本地广播无法静态注册，因为发送本地广播的时候，程序肯定已经启动了，而静态注册主要是让程序在未启动的情况下也能收到广播。
此示例见上述例子。

自定义广播Broadcast

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