在有序广播中添加自定义权限

绝地灬酷狼 2022-07-17 01:22 182阅读 0赞

首先我们要在AndroidManifest.xml中自定义一个权限,格式参考系统自带的权限,android.permission.XXXXX,只要是xxx.peimission.XXXXXX就行,如果不按照这个格式,那么这个权限可能没法使用。

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.lsj.broadcasttest">
       <span style="color:#FF0000;"> <permission
            android:name="test.permission.TEST"
            android:protectionLevel="normal"
            ></permission></span>
        <application
            android:allowBackup="true"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:supportsRtl="true"
            android:theme="@style/AppTheme">
            <activity android:name=".MainActivity">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
    
            <receiver
                android:name=".MyReceiver"
                android:enabled="true"
                android:exported="true">
                <intent-filter android:priority="20">
                    <action android:name="hahaha" />
                </intent-filter>
            </receiver>
            <receiver
                android:name=".MyReceiver2"
                android:enabled="true"
                android:exported="true">
                <intent-filter android:priority="19">
                    <action android:name="hahaha" />
                </intent-filter>
    
            </receiver>
        </application>
    
       <span style="color:#FF0000;"> <uses-permission android:name="test.permission.TEST"/></span>
    </manifest>

然后使用sendOrderedBroadcast(intent,"test.permission.TEST");就可以发送有序广播了,当然发送广播之前还要指定一下接受者的优先级,优先级越高,android:priority指定的数字就越大。取值的范围是:-1000~1000这个就不详细叙述了。

public class MainActivity extends AppCompatActivity {
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            Button send= (Button) findViewById(R.id.send);
            send.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent intent=new Intent();
                    intent.setAction("hahaha");
    
                    intent.putExtra("msg","一个简单的消息");
                    sendOrderedBroadcast(intent,"test.permission.TEST");
                }
            });
        }
    }

第一个BroadcastReceiver在接收到广播的时候,如果想要添加一些自己的东西进去,可以先创建一个Bundle对象,并且存入数据。

然后通过setResultExtras(bundle),把这个bundle添加到原来的消息中,

ublic class MyReceiver extends BroadcastReceiver {
        public MyReceiver() {
        }
    
        @Override
        public void onReceive(Context context, Intent intent) {
            Toast.makeText(context,"接收到的Intent的Action为:"+intent.getAction()+"\n消息内容是:"+intent.getStringExtra("msg"),Toast.LENGTH_LONG).show();
            Bundle bundle=new Bundle();
            bundle.putString("first","第一个BroadCast存入的消息!");
            setResultExtras(bundle);
    
        }
    }

下一个BroadcastReceiver通过getResultExtras可以将信息提取出来。

ublic class MyReceiver2 extends BroadcastReceiver {
        public MyReceiver2() {
        }
    
        @Override
        public void onReceive(Context context, Intent intent) {
            // TODO: This method is called when the BroadcastReceiver is receiving
            Bundle bundle=getResultExtras(true);
            String first=bundle.getString("first");
            Toast.makeText(context,"第一个BroadCast存入的消息为:"+first,Toast.LENGTH_LONG).show();
        }
    }