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標題: android Multi-Thread [打印本頁]

作者: 51黑fan 時間: 2016-1-31 02:39
標題: android Multi-Thread
/********************************************************

*2015年3月2日 11:18:37
*功能：通過多線程從互聯網現在一幅圖片并顯示、
*知識點：
* Runnable多線程類
* 圖片的解碼：BitmapFactory.decodeByteArray(data,0,data.length);
*
*step：1 Runnable多線程類run方法中寫多線程函數并通過Message類傳給Handler
* 2 Handler中過public void handleMessage(Message msg)獲取多線程中傳回的數據
*    3 onClick()通過new Thread(new MyThread()).start();開啟線程
*/

package com.example.handler;

import java.io.InputStream;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;

import android.R.string;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;

public class MainActivity extends Activity {

private Button button;
private ImageView imagineView;
private String image_path="http://m.zg4o1577.cn/bbs/static/image/common/logo.png";
private final int IS_FINISH=1;

private Handler handler=new Handler(){ // step3：獲取數據

@Override
public void handleMessage(Message msg) {
// TODO Auto-generated method
byte[] data=(byte[])msg.obj;//取書據
Bitmap bm=BitmapFactory.decodeByteArray(data,0,data.length);//圖片解碼
imagineView.setImageBitmap(bm);
if(msg.what==IS_FINISH)
{
Toast.makeText(MainActivity.this,"下載成功",Toast.LENGTH_SHORT).show();
}

super.handleMessage(msg);
}

};
@Override
protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      button=(Button)this.findViewById(R.id.button1);
      imagineView=(ImageView)this.findViewById(R.id.imageView1);
      button.setOnClickListener(new View.OnClickListener() {

@Override
public void onClick(View arg0) {

// TODO Auto-generated method stub
new Thread(new MyThread()).start();    //step4:開線程
}
});
}

public class MyThread implements Runnable    //step1：定義多線程類
{
   @Override
public void run() { // step2：線程耗時，完成下載
// TODO Auto-generated method stub

HttpClient httpClient=new DefaultHttpClient();//獲取網絡數據
HttpGet httpGet=new HttpGet(image_path);
HttpResponse httpResponse=null;
//InputStream inputStream=null;

try{
httpResponse=httpClient.execute(httpGet);
if(httpResponse.getStatusLine().getStatusCode()==200)
{
//inputStream=httpResponse.getEntity().getContent();
byte[]data=EntityUtils.toByteArray(httpResponse.getEntity());
      //把數據發送給Handler
//Message可以攜帶數據返回給Handler
Message message=Message.obtain();//攜帶數據
message.obj=data;
message.what=IS_FINISH;
handler.sendMessage(message);//發送到handler
}
}catch(Exception e)
{
Toast.makeText(MainActivity.this,"捕獲異常信息1",Toast.LENGTH_SHORT).show();
}


}
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
      // Inflate the menu; this adds items to the action bar if it is present.
      getMenuInflater().inflate(R.menu.main, menu);
      return true;
}

}

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