Android广播接收器Broadcast Receiver-android学习之旅（十二）

首先继承BroadcastReceiver类，并在manifest中注册

public class MyReceiver extends BroadcastReceiver {    public MyReceiver() {    }    @Override    public void onReceive(Context context, Intent intent) {        throw new UnsupportedOperationException("Not yet implemented");    }}

在mainifest中注册

<receiver            android:name=".MyReceiver"            android:enabled="true"            android:exported="true" >        </receiver>

动态注册和取消广播接收器

上代码：
Receiver部分：

public class MyReceiver extends BroadcastReceiver {    public static final String ACTION = "peng.liu.testview.intent.action.MyReceiver";    public MyReceiver() {    }    @Override    public void onReceive(Context context, Intent intent) {        System.out.println(intent.getStringExtra("data")+"hello");    }}

主类部分：

public class MainActivity extends Activity implements View.OnClickListener{    private MyReceiver receiver = null;    private Button send,reg,unReg;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        findViewById(R.id.send).setOnClickListener(this);        findViewById(R.id.reg).setOnClickListener(this);        findViewById(R.id.unReg).setOnClickListener(this);    }    @Override    public void onClick(View view) {        switch (view.getId()){            case R.id.send:                Intent intent = new Intent(MyReceiver.ACTION);                intent.putExtra("data","jiekxueyuan");                sendBroadcast(intent);                break;            case R.id.reg:                if (receiver == null){                    receiver = new MyReceiver();                    registerReceiver(receiver,new IntentFilter(MyReceiver.ACTION));                }                break;            case R.id.unReg:                if (receiver != null){                    unregisterReceiver(receiver);                    receiver = null;                }                break;        }    }}

布局代码：

<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:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    android:paddingBottom="@dimen/activity_vertical_margin"    tools:context=".MainActivity"    android:orientation="vertical">    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="reg"        android:id="@+id/reg" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="unReg"        android:id="@+id/unReg" />    <Button        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="send"        android:id="@+id/send" /></LinearLayout>

广播的优先级

这次我们在manifest中静态注册

<receiver            android:name=".MyReceiver"            android:enabled="true"            android:exported="true" >            <intent-filter android:priority="8">                <action android:name="peng.liu.testview.intent.action.MyReceiver"/>            </intent-filter>        </receiver>        <receiver            android:name=".MyReceiver2"            android:enabled="true"            android:exported="true" >            <intent-filter android:priority="9">                <action android:name="peng.liu.testview.intent.action.MyReceiver"/>            </intent-filter>        </receiver>

android：priority：用于设置优先级，数字越大，优先级越高。

高优先级的终端广播

//发送部分注意是发送sendOrderedBroadcast(intent,null);Intent intent = new Intent(MyReceiver.ACTION);                intent.putExtra("data","jiekxueyuan");                sendOrderedBroadcast(intent,null);

接收部分

public class MyReceiver2 extends BroadcastReceiver {    public MyReceiver2() {    }    @Override    public void onReceive(Context context, Intent intent) {        System.out.println(intent.getStringExtra("data"));        //这一户用于中断后面的低优先级的接受        abortBroadcast();    }}