android

如何在两个activity之间传递handler-利用broadcast广播机制

这算是如何在两个activity之间传递handler的解决方案二了，解决方案一见http://blog.csdn.net/jason0539/article/details/18055259

再重复一遍我遇到的问题，就是在MainActivity里面打开AnotherActivity去执行一些操作，相应的改变MainActivity里的一些布局或者执行一些动作，最开始想到的就是把MainActivity的Handler直接传给AnotherActivity，好像不可行，就有了这篇和上一篇文章。

上一篇方案一是通过重写application来在两个activity之间共享Handler的，今天这个方案是通过广播机制解决本来想要通过传递handler来实现的功能，算是Activity之间传递Handler问题的变通方案，其实很简单，就是Broadcast的应用，替换了原来想要通过共享handler解决的思路。

代码如下：

MainActivity：

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package jason.broadcastinsteadofhanlderdemo;  
  
import android.app.Activity;  
import android.content.BroadcastReceiver;  
import android.content.Context;  
import android.content.Intent;  
import android.content.IntentFilter;  
import android.os.Bundle;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.Button;  
import android.widget.TextView;  
  
public class MainActivity extends Activity {  
  
    TextView textView;  
    Button sButton;  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        textView = (TextView) findViewById(R.id.show);  
        sButton = (Button) findViewById(R.id.startAnother);  
        sButton.setOnClickListener(new OnClickListener() {  
              
            @Override  
            public void onClick(View v) {  
                // TODO Auto-generated method stub  
                startActivity(new Intent(MainActivity.this,AnotherActivity.class));  
            }  
        });  
        IntentFilter filter = new IntentFilter(AnotherActivity.action);  
        registerReceiver(broadcastReceiver, filter);  
    }  
  
    BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {  
  
        @Override  
        public void onReceive(Context context, Intent intent) {  
            // TODO Auto-generated method stub  
            textView.setText(intent.getExtras().getString("data"));  
        }  
    };  
  
    protected void onDestroy() {  
        unregisterReceiver(broadcastReceiver);  
    };  
}

AnotherActivity：

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package jason.broadcastinsteadofhanlderdemo;  
  
import android.app.Activity;  
import android.content.Intent;  
import android.os.Bundle;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.Button;  
  
public class AnotherActivity extends Activity {  
  
    public static final String action = "jason.broadcast.action";  
  
    Button update;  
  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        // TODO Auto-generated method stub  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.another);  
        update = (Button) findViewById(R.id.updateMain);  
        update.setOnClickListener(new OnClickListener() {  
  
            @Override  
            public void onClick(View v) {  
                // TODO Auto-generated method stub  
                Intent intent = new Intent(action);  
                intent.putExtra("data", "yes i am data");  
                sendBroadcast(intent);  
                finish();  
            }  
        });  
    }  
}

代码地址：http://download.csdn.net/detail/jason0539/6832899

博客：http://blog.csdn.net/jason0539（转载请说明出处）