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

时间:2021-01-15 23:50:04

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();			}		});	}}


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)