AsyncTask

[java]代码库
package com.example.day_07asynctask;
 
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import java.util.concurrent.ExecutionException;
 
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.widget.ImageView;
import android.widget.ProgressBar;
 
public class MainActivity extends Activity {
 
    private ImageView imageview;
    private ProgressBar progressBar;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        imageview = (ImageView) findViewById(R.id.imageview);
        progressBar = (ProgressBar) findViewById(R.id.progressBar);
    }
    public void button(View v){
        AsyncTask<URL, Integer, Bitmap> asyncTask=new AsyncTask<URL, Integer, Bitmap>() {
            private Bitmap bitmap;
            @Override
            protected void onPreExecute() {
                // TODO Auto-generated method stub
                super.onPreExecute();
                progressBar.setVisibility(View.VISIBLE);
            }
            @Override
            protected Bitmap doInBackground(URL... params) {
                try {
                    String path="http://zxpic.gtimg.com/infonew/0/wechat_pics_-8590809.jpg/640";
                    URL url=new URL(path);
                    HttpURLConnection openConnection = (HttpURLConnection) url.openConnection();
                    openConnection.setConnectTimeout(5000);
                    openConnection.setRequestMethod("GET");
                    openConnection.setReadTimeout(5000);
                    openConnection.connect();
                    if(200==openConnection.getResponseCode()){
                        InputStream inputStream = openConnection.getInputStream();
                        bitmap = BitmapFactory.decodeStream(inputStream);
                        //返回
                        return bitmap;
                    }
                } catch (MalformedURLException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                return null;
            }
            @Override
            protected void onPostExecute(Bitmap result) {
                // TODO Auto-generated method stub
                super.onPostExecute(result);
                imageview.setImageBitmap(bitmap);
                progressBar.setVisibility(View.GONE);
            }
        };
        asyncTask.execute();
         
    }
     
 
 
    
}
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