一个activity控制另一个activityUI更新(利用broadcast广播机制)

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：

[java] view
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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：

[java] view
plaincopyprint?





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

作者：jason0539

微博：http://weibo.com/2553717707

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