package com.test.activity; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import java.net.URL; import java.net.URLConnection; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.view.Window; import android.widget.ImageView; import com.test.R; public class BitmapActivity extends Activity { private ImageView imageView ; private final static String IMAGEURL = "https://gss1.bdstatic.com/5eN1dDebRNRTm2_p8IuM_a/res/img/logo/logo201509091.png"; private Handler handler = new Handler(){ @Override public void handleMessage(Message msg) { File file = (File)msg.obj; Bitmap bitmap = null; try { bitmap = BitmapFactory.decodeStream(new FileInputStream(file)); } catch (FileNotFoundException e) { e.printStackTrace(); } imageView.setImageBitmap(bitmap); } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); setContentView(R.layout.bitmap); imageView = (ImageView)findViewById(R.id.imageView); new Thread(){ @Override public void run() { Message message = handler.obtainMessage(); message.obj = downloadFile(IMAGEURL); message.sendToTarget(); } }.start(); } //下载图片 private File downloadFile(String urlStr){ URL url = null ; InputStream input = null ; OutputStream output = null ; File file = null ; try { url = new URL(urlStr); URLConnection urlConnection = url.openConnection(); urlConnection.setConnectTimeout(5*1000); input = urlConnection.getInputStream(); file = File.createTempFile("xxxx", "jpg"); output = new FileOutputStream(file) ; byte[] byt = new byte[1024]; int length = 0; // 开始读取 while ((length = input.read(byt)) != -1) { output.write(byt, 0, length); } input.close(); output.close(); System.out.println("下载完成"); } catch (Exception e) { e.printStackTrace(); System.out.println("下载出错"); } return file ; } }
Android 图片下载并显示
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