Android 非同步下載

標籤：setimage   amp   scree   port   android   down   nload   pixel   ace   

package com.example.demo1;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.net.HttpURLConnection;import java.net.URL;import com.tiffdecoder.TiffDecoder;import android.app.Activity;import android.graphics.Bitmap;import android.os.AsyncTask;import android.widget.ImageView;public class DownloadImagesTask extends AsyncTask<Object, Void, Bitmap> {    ImageView imageView = null;    Activity activity = null;        @Override    protected Bitmap doInBackground(Object... parameters) {        this.imageView = (ImageView)parameters[0];        this.activity = (Activity)parameters[1];        try {            return download_Image((String)imageView.getTag());        } catch (IOException e) {            e.printStackTrace();        }        return null;    }        @Override    protected void onPostExecute(Bitmap result) {        if(result != null)            imageView.setImageBitmap(result);    }        private Bitmap download_Image(String url) throws IOException {        File file = downloadFile(url);        TiffDecoder.nativeTiffOpen(file.getPath());        int[] pixels = TiffDecoder.nativeTiffGetBytes();        Bitmap mBitmap = Bitmap.createBitmap(pixels, TiffDecoder.nativeTiffGetWidth(), TiffDecoder.nativeTiffGetHeight(),Bitmap.Config.ARGB_8888);        TiffDecoder.nativeTiffClose();        return mBitmap;    }        private File downloadFile(String strUrl) throws IOException    {        URL url = new URL(strUrl);        HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();        urlConnection.setRequestMethod("GET");        urlConnection.setDoOutput(true);        urlConnection.connect();                File file = File.createTempFile("myfile", ".tif", this.activity.getCacheDir());        if(file.exists())            file.delete();        file.createNewFile();        FileOutputStream fileOutput = new FileOutputStream(file);        InputStream inputStream = urlConnection.getInputStream();        byte[] buffer = new byte[1024];        int bufferLength = 0;        while ( (bufferLength = inputStream.read(buffer)) > 0 ) {            fileOutput.write(buffer, 0, bufferLength);        }        fileOutput.close();        return file;    }}

public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        StrictMode.setThreadPolicy(new                 StrictMode.ThreadPolicy.Builder().detectDiskReads().detectDiskWrites().detectNetwork().penaltyLog().build());                        StrictMode.setVmPolicy(                new StrictMode.VmPolicy.Builder().detectLeakedSqlLiteObjects().detectLeakedClosableObjects().penaltyLog().penaltyDeath().build());                                getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,                                WindowManager.LayoutParams.FLAG_FULLSCREEN);        ImageView image = (ImageView)this.findViewById(R.id.image);        image.setTag("http://xibei1-image.xxx.com/00006009b4673bbc-ff2a-49bd-91fe-764c01b2acce01.tif");        new DownloadImagesTask().execute(image,this);    }}

 

Android 非同步下載