解决Android解析图片的OOM问题的方法!!!

options.inJustDecodeBounds = false/true; 
//图片压缩比例. 
options.inSampleSize = ssize; 

package com.tutor.oom; 
import java.io.InputStream; 
 
import android.content.ContentResolver; 
import android.content.Context; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.graphics.BitmapFactory.Options; 
import android.net.Uri; 
 
/** 
 * @author frankiewei. 
 * 工具类. 
 */ 
public class ImageCacheUtil { 
 
  /** 
   * 获取合适的Bitmap平时获取Bitmap就用这个方法吧. 
   * @param path 路径. 
   * @param data byte[]数组. 
   * @param context 上下文 
   * @param uri uri 
   * @param target 模板宽或者高的大小. 
   * @param width 是否是宽度 
   * @return 
   */ 
  public static Bitmap getResizedBitmap(String path, byte[] data, 
      Context context,Uri uri, int target, boolean width) { 
    Options options = null; 
 
    if (target > 0) { 
 
      Options info = new Options(); 
      //这里设置true的时候，decode时候Bitmap返回的为空， 
      //将图片宽高读取放在Options里. 
      info.inJustDecodeBounds = false; 
       
      decode(path, data, context,uri, info); 
       
      int dim = info.outWidth; 
      if (!width) 
        dim = Math.max(dim, info.outHeight); 
      int ssize = sampleSize(dim, target); 
 
      options = new Options(); 
      options.inSampleSize = ssize; 
 
    } 
 
    Bitmap bm = null; 
    try { 
      bm = decode(path, data, context,uri, options); 
    } catch(Exception e){ 
      e.printStackTrace(); 
    } 
    return bm; 
 
  } 
   
  /** 
   * 解析Bitmap的公用方法. 
   * @param path 
   * @param data 
   * @param context 
   * @param uri 
   * @param options 
   * @return 
   */ 
  public static Bitmap decode(String path, byte[] data, Context context, 
      Uri uri, BitmapFactory.Options options) { 
 
    Bitmap result = null; 
 
    if (path != null) { 
 
      result = BitmapFactory.decodeFile(path, options); 
 
    } else if (data != null) { 
 
      result = BitmapFactory.decodeByteArray(data, 0, data.length, 
          options); 
 
    } else if (uri != null) { 
      //uri不为空的时候context也不要为空. 
      ContentResolver cr = context.getContentResolver(); 
      InputStream inputStream = null; 
 
      try { 
        inputStream = cr.openInputStream(uri); 
        result = BitmapFactory.decodeStream(inputStream, null, options); 
        inputStream.close(); 
      } catch (Exception e) { 
        e.printStackTrace(); 
      } 
 
    } 
 
    return result; 
  } 
   
   
  /** 
   * 获取合适的sampleSize. 
   * 这里就简单实现都是2的倍数啦. 
   * @param width 
   * @param target 
   * @return 
   */ 
  private static int sampleSize(int width, int target){       
      int result = 1;      
      for(int i = 0; i < 10; i++){        
        if(width < target * 2){ 
          break; 
        }         
        width = width / 2; 
        result = result * 2;         
      }       
      return result; 
    } 
} 

package com.tutor.oom; 
 
import android.app.Activity; 
import android.content.Intent; 
import android.graphics.Bitmap; 
import android.os.Bundle; 
import android.provider.MediaStore; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.ImageView; 
 
/** 
 * @author frankiewei. 
 * 解决图片普通OOM的Demo. 
 */ 
public class ImageCacheDemoActivity extends Activity { 
   
   
  /** 
   * 显示图片的ImageView. 
   */ 
  private ImageView mImageView; 
   
  /** 
   * 打开本地相册的requestcode. 
   */ 
  public static final int OPEN_PHOTO_REQUESTCODE = 0x1; 
   
  /** 
   * 图片的target大小. 
   */ 
  private static final int target = 400; 
   
   
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 
     
    setupViews(); 
  } 
   
  private void setupViews(){ 
    mImageView = (ImageView)findViewById(R.id.imageview); 
    mImageView.setOnClickListener(new OnClickListener() { 
       
      public void onClick(View v) { 
        openPhotos();       
      } 
    }); 
  } 
   
  /** 
   * 打开本地相册. 
   */ 
  private void openPhotos() { 
 
    Intent intent = new Intent(Intent.ACTION_PICK, null); 
    intent.setDataAndType(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, 
        "image/*"); 
 
    startActivityForResult(intent, OPEN_PHOTO_REQUESTCODE); 
 
  } 
   
  @Override 
  protected void onActivityResult(int requestCode, int resultCode, Intent data) { 
    switch (requestCode) { 
    case OPEN_PHOTO_REQUESTCODE: 
      if(resultCode == RESULT_OK){ 
        //如果用这个方法，Options为null时候，就是默认decode会出现oom哦. 
        //Bitmap bm = ImageCacheUtil.decode(null, null,  
        //   ImageCacheDemoActivity.this, data.getData(), null); 
         
        //这里调用这个方法就不会oom.屌丝们就用这个方法吧. 
        Bitmap bm = ImageCacheUtil.getResizedBitmap(null, null,  
            ImageCacheDemoActivity.this, data.getData(), target, false); 
        mImageView.setImageBitmap(bm); 
      } 
       
      break; 
 
    default: 
      break; 
    } 
    super.onActivityResult(requestCode, resultCode, data); 
  } 
} 

<?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" > 
 
  <TextView 
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello" /> 
   
  <ImageView 
    android:id="@+id/imageview"  
    android:layout_width="400px" 
    android:layout_height="400px" 
    android:src="@drawable/ic_launcher" 
    /> 
 
</LinearLayout>