Android Bitmap网络图片下载

package com.image.com; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Matrix; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.ImageView; import android.widget.TextView; public class MainActivity extends Activity { // 远程服务器地址下载 private String mString = "http://img.ivsky.com/img/bizhi/img/201106/13/hanguo_fengjing-011.jpg"; // private String mString = "http://localhost:8080/Web_test/pic.png"; // 本地服务器地址下载(此地址需先在本地创建Tomcat服务器) // private String mString = "http://10.0.2.2:8080/WebServer/123.jpg"; private Button mButton; private TextView mTextView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mButton = (Button) findViewById(R.id.but); mButton.setOnClickListener(new View.OnClickListener() { public void onClick(View v) { // 第一种方法获得图片 // GetImage(); // 第二种方法获得图片 Bitmap bit = getBitmapFormURL(mString); ImageView iv = (ImageView) findViewById(R.id.image); Bitmap bit2 = scaleImg(bit, 100, 100); iv.setImageBitmap(bit2); System.out.println(bit + "----------"); System.out.println(bit2 + "----------"); mTextView = (TextView) findViewById(R.id.text); mTextView.setText("您获取图片的地址是：" + mString); mButton.setText("点击退出"); mButton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { finish(); } }); } }); } public static Bitmap scaleImg(Bitmap bm, int newWidth, int newHeight) { // 获得图片的宽高 int width = bm.getWidth(); int height = bm.getHeight(); // 设置想要的大小 int newWidth1 = newWidth; int newHeight1 = newHeight; // 计算缩放比例 float scaleWidth = ((float) newWidth1) / width; float scaleHeight = ((float) newHeight1) / height; // 取得想要缩放的matrix参数 Matrix matrix = new Matrix(); matrix.postScale(scaleWidth, scaleHeight); // 得到新的图片 Bitmap newbm = Bitmap.createBitmap(bm, 0, 0, width, height, matrix, true); return newbm; } public void GetImage() { try { URL url = new URL(mString); InputStream is = url.openStream(); Bitmap bitmap = BitmapFactory.decodeStream(is); ImageView iv = (ImageView) findViewById(R.id.image); iv.setImageBitmap(bitmap); iv.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { ImageView iv = (ImageView) findViewById(R.id.image); iv.setVisibility(View.GONE); } }); } catch (MalformedURLException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } // 第二种方法获得图片 public static Bitmap getBitmapFormURL(String strURL) { Bitmap bm = null; try { URL url = new URL(strURL); URLConnection con = url.openConnection(); bm = BitmapFactory.decodeStream(con.getInputStream()); // 待处理缩放 Bitmap resizeBmp = null; BitmapFactory.Options opt = new BitmapFactory.Options(); } catch (Exception e) { } return bm; } public static Bitmap fitSizePic(File f) { Bitmap resizeBmp = null; BitmapFactory.Options opts = new BitmapFactory.Options(); // 数字越大读出的图片占用的heap越小 不然会溢出内存 if (f.length() < 51200) { // 20-50k opts.inSampleSize = 1; } else if (f.length() < 307200) { // 50-300k opts.inSampleSize = 2; } else if (f.length() < 819200) { // 300-800k opts.inSampleSize = 4; } else if (f.length() < 1048576) { // 800-1024k opts.inSampleSize = 6; } else { opts.inSampleSize = 8; } resizeBmp = BitmapFactory.decodeFile(f.getPath(), opts); return resizeBmp; } }