触发BroadcastReceiver以更新另一个活动

// 定义BroadcastReceiver
public class MyBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // 处理接收到的广播消息
        String data = intent.getStringExtra("data");
        
        // 更新另一个活动的内容
        Intent updateIntent = new Intent(context, AnotherActivity.class);
        updateIntent.putExtra("data", data);
        context.startActivity(updateIntent);
    }
}

// 注册BroadcastReceiver
public class MainActivity extends AppCompatActivity {
    private MyBroadcastReceiver receiver;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        // 注册广播接收器
        receiver = new MyBroadcastReceiver();
        IntentFilter filter = new IntentFilter("com.example.UPDATE_ACTIVITY");
        registerReceiver(receiver, filter);
    }
    
    @Override
    protected void onDestroy() {
        super.onDestroy();
        
        // 取消注册广播接收器
        unregisterReceiver(receiver);
    }
    
    public void sendBroadcast(View view) {
        // 发送广播
        Intent intent = new Intent("com.example.UPDATE_ACTIVITY");
        intent.putExtra("data", "Hello, World!");
        sendBroadcast(intent);
    }
}

// 更新另一个活动
public class AnotherActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_another);
        
        // 获取广播消息
        String data = getIntent().getStringExtra("data");
        
        // 更新UI或执行其他操作
        TextView textView = findViewById(R.id.textView);
        textView.setText(data);
    }
}