android開發之如何在兩個activity之間傳遞handler_利用broadcast廣播機制

再重復一遍我遇到的問題，就是在MainActivity裡面打開AnotherActivity去執行一些操作，相應的改變MainActivity裡的一些布局或者執行一些動作，最開始想到的就是把MainActivity的Handler直接傳給AnotherActivity，好像不可行，就有了這篇和上一篇文章。

上一篇方案一是通過重寫application來在兩個activity之間共享Handler的，今天這個方案是通過廣播機制解決本來想要通過傳遞handler來實現的功能，算是Activity之間傳遞Handler問題的變通方案，

其實很簡單，就是Broadcast的應用，替換了原來想要通過共享handler解決的思路。

代碼如下：

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();
			}
		});
	}
}

代碼地址：http://download.csdn.net/detail/jason0539/6832899

作者：jason0539

微博：http://weibo.com/2553717707

博客：http://blog.csdn.net/jason0539（轉載請說明出處）