关于使用handler与BroadcastReceiver机制来处理动态改变U线程组件
2015-08-20 22:42
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当在同一个Activity中的一些操作会改变这个Activity上的组件显示,可以在这个UI线程(Activity)上设置handler并重写handleMessage()方法来处理消息,并在这个Activity上重开一个线程new Thread()来进行消息Message的发送,以此来触发UI线程上的handler,达到改变UI组件的目的。
当ActivityA上的组件会因为ActivityB上的操作而发生改变时候,使用Broadcast机制来实现UI变化的触发会比handler&Message更方便。具体例子见例子:
转载自: http://blog.csdn.net/jason0539/article/details/18075293
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
plaincopyprint?
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();
}
});
}
}
当ActivityA上的组件会因为ActivityB上的操作而发生改变时候,使用Broadcast机制来实现UI变化的触发会比handler&Message更方便。具体例子见例子:
转载自: http://blog.csdn.net/jason0539/article/details/18075293
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
plaincopyprint?
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();
}
});
}
}
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