扣丁学堂——BroadcastReceiver（广播）

来源：互联网发布：淘宝地区怎么修改编辑：程序博客网时间：2024/05/11 04:51

源码见本文

一丶测试效果：略

二丶课程讲解

1.普通广播代码：

广播接收器：

public class MyReceiver01 extends BroadcastReceiver {    public MyReceiver01() {    }    @Override    public void onReceive(Context context, Intent intent) {        String i = intent.getStringExtra("info");        Toast.makeText(context, i, Toast.LENGTH_SHORT).show();    }}

2.Activity.java

public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void sendNormal(View v) {        Intent intent = new Intent("com.ke.action.MY_BROADCAST");//action字符相当于广播的频率一样        intent.putExtra("info", "this is boradcast");//要发送广播的内容        this.sendBroadcast(intent);//发送广播    }}

3.清单文件

<receiver    android:name=".MyReceiver01"    android:enabled="true"    android:exported="true"    >    <intent-filter>        <action android:name="com.ke.action.MY_BROADCAST"></action>    </intent-filter>

上面是静态注册，这里就说一下动态注册

广播接收器2

public class MyReceiver2 extends BroadcastReceiver {    public MyReceiver2() {    }    @Override    public void onReceive(Context context, Intent intent) {        Toast.makeText(context,"动态接受广播",Toast.LENGTH_SHORT).show();    }}

Activity.java

public class MainActivity extends AppCompatActivity {    private MyReceiver2 receiver2=new MyReceiver2();    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }//该方法注册广播    @Override    protected void onResume() {        super.onResume();        IntentFilter filter=new IntentFilter();        filter.addAction("com.ke.action.MY_BROADCAST");        registerReceiver(receiver2,filter);    }//该方法解除广播    @Override    protected void onPause() {        unregisterReceiver(receiver2);        super.onPause();    }

这里效果演示是先输出动态广播

MainActivity.java

public void sendOrderClick(View v) {    Intent intent = new Intent("com.andorid.keke");    //参数：intent ,接收权限：接收广播接收器需的权限    this.sendOrderedBroadcast(intent, null);}

MyReceiver3

public class MyReceiver3 extends BroadcastReceiver {    public MyReceiver3() {    }    @Override    public void onReceive(Context context, Intent intent) {        Toast.makeText(context, "有序广播接收器-1", Toast.LENGTH_SHORT).show();        //中断有序广播        //this.abortBroadcast();        Bundle data = new Bundle();        data.putString("info","广播1");        this.setResultExtras(data);//将数据发送到下一个广播接收器中    }}

MyReceiver4

public class MyReceiver4 extends BroadcastReceiver {    public MyReceiver4() {    }    @Override    public void onReceive(Context context, Intent intent) {        Bundle data =  getResultExtras(false);// false:没有的话就不创建        Toast.makeText(context, data.getString("info").toString(), Toast.LENGTH_SHORT).show();    }}

清单文件

<receiver    android:name=".MyReceiver3"    android:enabled="true"    android:exported="true" >    <intent-filter android:priority="200">        <action android:name="com.andorid.keke"></action>    </intent-filter></receiver><receiver    android:name=".MyReceiver4"    android:enabled="true"    android:exported="true" >    <intent-filter android:priority="100">        <action android:name="com.andorid.keke"></action>    </intent-filter></receiver>

演示了一个跳转发送例子略

关于广播后期再加强，这里只是提到基本操作。

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