Android 实战之UI线程和Worker线程交互
哈哈,博文取了个比较霸气的名字,大家不都喜欢这样忽悠人吗 呵呵!
好了,现在就是很简单的点击查询,然后这个查询有点花时间,不想见面出现假死现象,所以在另外的线程进行查询。
好了,代码在此:
package com.example.gulanfinddemo; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.os.Handler; import android.os.Looper; import android.os.Message; import android.util.Log; import android.widget.EditText; public class FindResActivity extends Activity { private MyHandler handler; private Boolean isKeywordFindBoolean = false; EditText resText; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_find_res); resText = (EditText)findViewById(R.id.ResText); Log.v("FindResActivity threadId:", String.valueOf(Thread.currentThread().getId())); Intent intent = getIntent(); String findReString; if (null != intent.getStringExtra(MainActivity.suraAyaFindStr)) { findReString = "按章节查询"; isKeywordFindBoolean = false; } else { findReString = "按关键字查询"; isKeywordFindBoolean = true; } Looper looper = Looper.myLooper(); handler = new MyHandler(looper); new findContentThread(handler, findReString).start(); //resText.setText(findReString); } private class MyHandler extends Handler{ public MyHandler(Looper looper){ super(looper); } public void handleMessage(Message msg){ if (msg.what == 0) { Bundle bundle = msg.getData(); resText.setText(bundle.getString("res")); } } } }
看出来了,重载了handler,在
handleMessage里会进行UI的更新。
package com.example.gulanfinddemo;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
public class findContentThread extends Thread{
private String queryKeyString;
private Handler handler;
public findContentThread(Handler sendHandler,String string){
queryKeyString = string;
handler = sendHandler;
}
public void run(){
Log.v("findContentThread threadId:", String.valueOf(Thread.currentThread().getId()));
Message msgMessage = new Message();
Bundle bundle = new Bundle();
bundle.putString("res", queryKeyString);
msgMessage.setData(bundle);
msgMessage.what = 0;
handler.sendMessage(msgMessage);
super.run();
}
}
在这里用了扩展Thread的方法,处理之后handler会传回消息,之后就在handler里处理消息了。
然后里面打印了线程ID,从其中可以确定的确是在不同的线程里执行的。