解決Bitmap中的OOM問題

http://lcd.yesky.com/imagelist/2009/315/qwm3qsg1r0l9.jpg  這張網狀圖片非常大，如果直接用BitmapFactory.decodeStream(new URL(url).openStream())的話就會出現OOM問題，採用以下方法可以有效解決此問題的發生

package com.test.bitmap;import java.io.IOException;import java.net.MalformedURLException;import java.net.URL;import android.app.Activity;import android.content.Context;import android.content.Intent;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.os.Handler;import android.os.Message;import android.view.Menu;import android.view.MenuInflater;import android.view.MenuItem;import android.widget.ImageView;import android.widget.Toast;public class BitmapDemoActivity extends Activity {    /** Called when the activity is first created. */private ImageView iv;private Handler mhanHandler=new Handler(){public void handleMessage(android.os.Message msg) {iv.setImageBitmap((Bitmap)msg.obj);};};    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        //http://lcd.yesky.com/imagelist/2009/315/qwm3qsg1r0l9.jpg                iv=(ImageView) findViewById(R.id.img);        final String url="http://lcd.yesky.com/imagelist/2009/315/qwm3qsg1r0l9.jpg";                new  Thread (){        public void run() {                try {BitmapFactory.Options options = new BitmapFactory.Options();options.inJustDecodeBounds = true;BitmapFactory.decodeStream(new URL(url).openStream(),null,options);            int width=options.outWidth, height=options.outHeight;int scale=1;int temp=width>height?width:height;while(true){    if(temp/2<120)        break;    temp=temp/2;    scale*=2;}BitmapFactory.Options opt = new BitmapFactory.Options();opt.inSampleSize=scale;Bitmap bitmap= BitmapFactory.decodeStream(new URL(url).openStream(), null, opt);Message msg=mhanHandler.obtainMessage();msg.obj=bitmap;mhanHandler.sendMessage(msg);} catch (Exception e) {e.printStackTrace();}        };                }.start();    }                 @Override public boolean onCreateOptionsMenu(Menu menu) {     MenuInflater inflater = getMenuInflater();     inflater.inflate(R.menu.menu, menu);     return true; }    @Override public boolean onOptionsItemSelected(MenuItem item) {     // Handle item selection     switch (item.getItemId()) {         case R.id.login:                 Toast.makeText(this, "login", 0).show();             return true;         case R.id.regist:         Toast.makeText(this, "regist", 0).show();             return true;         case R.id.about:         Toast.makeText(this, "about", 0).show();             return true;                      case R.id.exit:         Toast.makeText(this, "exit", 0).show();             return true;         default:             return super.onOptionsItemSelected(item);     } }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical" >    <ImageView        android:id="@+id/img"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:background="@drawable/ic_launcher" /></LinearLayout>