Android学习笔记BroadcastReceiver(广播接收者)
Android发送广播的过程
代码实现
MainActivity.java
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button button = findViewById(R.id.btn_Broadcast);//获取广播按钮
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent();
intent.setAction("马云");
//为Itent添加动作zuckerg
sendBroadcast(intent);//发送广播
}
});
}
}
MyReceiver.java
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.widget.Toast;
public class MyReceiver extends BroadcastReceiver {
private static final String ACTIONI = "马云";//动作1
private static final String ACTION2 = "小腾腾";
@Override
public void onReceive(Context context, Intent intent) {
if(intent.getAction().equals(ACTIONI)){//回复第一个广播
Toast.makeText(context,
"MyReceiver收到:马云的广播",
Toast.LENGTH_SHORT).show();
}else if(intent.getAction().equals(ACTION2)){//回复第二个广播
Toast.makeText(context,"MyReceiver收到:小腾腾的广播",
Toast.LENGTH_SHORT).
show();
}
}
}
AndroidManifest.xml清单文件注册BroadcastReceiver
<!--
注册广播接收器
android:enabled="true"可以被实例化
android:exported="true"能接收其他app的广播
-->
<receiver
android:name=".MyReceiver"
android:enabled="true"
android:exported="true"
tools:ignore="WrongManifestParent">
<intent-filter>
<!--配置允许接收的Action-->
<action android:name="马云"/>
<action android:name="小腾腾"/>
</intent-filter>
</receiver>
</application>