【转】 android之如何在两个activity之间传递handler_利用broadcast广播机制

原文：http://blog.csdn.net/jason0539/article/details/18075293

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：

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：

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();
            }
        });
    }
}