使用本地广播

系统管理员 2022-06-15 04:44 198阅读 0赞

import android.content.BroadcastReceiver;
    import android.content.Context;
    import android.content.Intent;
    import android.content.IntentFilter;
    import android.os.Bundle;
    import android.support.v4.content.LocalBroadcastManager;
    import android.support.v7.app.AppCompatActivity;
    import android.view.View;
    import android.widget.Button;
    import android.widget.Toast;
    
    import com.wangdeqiang.www.chatwithrobot.R;
    
    /**
     * 本地广播的优势
     * 1.明确的知道正在发送的广播不会离开我们的程序,因此不必担心机密数据泄露.
     * 2.其他的程序无法将广播发送到我们程序的内部,因此不需要担心会有安全漏洞的隐患.
     * 3.
     */
    
    public class Main2Activity extends AppCompatActivity {
        
        private IntentFilter intentFilter;
        **private LocalReceiver localReceiver;
        private LocalBroadcastManager localBroadcastManager;**
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main2);
            localBroadcastManager = LocalBroadcastManager.getInstance(this); //获取实例
            Button button = (Button) findViewById(R.id.button);
            button.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Intent intent = new Intent("com.com.wangdeqiang.www.chatwithrobot.Broadcast.LOCAL_BROADCAST");
                    localBroadcastManager.sendBroadcast(intent);//发送本地广播
                }
            });
            intentFilter = new IntentFilter();
            intentFilter.addAction("com.com.wangdeqiang.www.chatwithrobot.Broadcast.LOCAL_BROADCAST");
            localReceiver = new LocalReceiver();
     //注册本地广播接收器localBroadcastManager.registerReceiver(localReceiver,intentFilter);
        }
    
        @Override
        protected void onDestroy() {
            super.onDestroy();
            localBroadcastManager.unregisterReceiver(localReceiver);
        }
    
        private class LocalReceiver extends BroadcastReceiver {
        
            @Override
            public void onReceive(Context context, Intent intent) {
                Toast.makeText(context,"Receive the local boradcast",Toast.LENGTH_SHORT).show();
            }
        }
    }

运行界面如图所示  
![这里写图片描述][SouthEast]

[SouthEast]: /images/20220615/0a711506dc3348499c14ab6cc0d99812.png