Java 显示照片时内存不足

我在android项目中使用一个对话框来显示图像。第一个可以正常打开，但当我关闭它并再次执行该过程以显示另一个时，应用程序会出现内存错误（它运行在三星galaxy s3上，所以不应该成为问题）

错误：

10-24 11:25:45.575: E/dalvikvm-heap(29194): Out of memory on a 31961104-byte allocation.
10-24 11:25:45.580: E/AndroidRuntime(29194): FATAL EXCEPTION: main
10-24 11:25:45.580: E/AndroidRuntime(29194): java.lang.OutOfMemoryError
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:587)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:389)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:418)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.graphics.drawable.Drawable.createFromPath(Drawable.java:882)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.widget.ImageView.resolveUri(ImageView.java:569)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.widget.ImageView.setImageURI(ImageView.java:340)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at com.directenquiries.assessment.tool.AddAsset.loadPhoto(AddAsset.java:771)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at com.directenquiries.assessment.tool.AddAsset$11.onClick(AddAsset.java:748)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at com.android.internal.app.AlertController$AlertParams$3.onItemClick(AlertController.java:936)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.widget.AdapterView.performItemClick(AdapterView.java:292)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.widget.AbsListView.performItemClick(AbsListView.java:1359)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.widget.AbsListView$PerformClick.run(AbsListView.java:2988)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.widget.AbsListView$1.run(AbsListView.java:3783)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.os.Handler.handleCallback(Handler.java:605)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.os.Handler.dispatchMessage(Handler.java:92)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.os.Looper.loop(Looper.java:137)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.app.ActivityThread.main(ActivityThread.java:4517)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at java.lang.reflect.Method.invokeNative(Native Method)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at java.lang.reflect.Method.invoke(Method.java:511)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:993)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:760)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at dalvik.system.NativeStart.main(Native Method)

public void loadPhotoList(){

    Cursor f = db.rawQuery("select * from stationphotos where StationObjectID =  '"+ checkStationObjectID + "'", null);  
    final ArrayList<String> mHelperNames= new ArrayList<String>();

            if(f.getCount() != 0) {
              f.moveToFirst();

                f.moveToFirst();
                while(!f.isAfterLast()) {
                    mHelperNames.add(f.getString(f.getColumnIndex("FilePath")));
                    f.moveToNext();
                }
            }
     f.close();
     final String [] nameStrings = new String [mHelperNames.size()];

     for(int i=0; i<mHelperNames.size(); i++)
        nameStrings[i] = mHelperNames.get(i).toString();


    AlertDialog.Builder builder = new AlertDialog.Builder(this);

    builder.setTitle("Select Picture");
    builder.setItems(nameStrings, new DialogInterface.OnClickListener() {

       public void onClick(DialogInterface dialog, int item) {

          loadPhoto(mHelperNames.get(item).toString());

       }

    });

    AlertDialog alert = builder.create();

    alert.show();

 }


public void loadPhoto(String imagepath){

    Dialog dialog = new Dialog(this);
    dialog.setContentView(R.layout.activity_show_image);
    dialog.setTitle("Image");
    dialog.setCancelable(true);

    ImageView img = (ImageView) dialog.findViewById(R.id.imageView1);
    img.setImageResource(R.drawable.ico_partial);
    Uri imgUri = Uri.parse(imagepath);
    img.setImageURI(imgUri);


    dialog.show();
}

加载代码：

10-24 11:25:45.575: E/dalvikvm-heap(29194): Out of memory on a 31961104-byte allocation.
10-24 11:25:45.580: E/AndroidRuntime(29194): FATAL EXCEPTION: main
10-24 11:25:45.580: E/AndroidRuntime(29194): java.lang.OutOfMemoryError
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:587)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:389)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:418)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.graphics.drawable.Drawable.createFromPath(Drawable.java:882)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.widget.ImageView.resolveUri(ImageView.java:569)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.widget.ImageView.setImageURI(ImageView.java:340)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at com.directenquiries.assessment.tool.AddAsset.loadPhoto(AddAsset.java:771)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at com.directenquiries.assessment.tool.AddAsset$11.onClick(AddAsset.java:748)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at com.android.internal.app.AlertController$AlertParams$3.onItemClick(AlertController.java:936)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.widget.AdapterView.performItemClick(AdapterView.java:292)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.widget.AbsListView.performItemClick(AbsListView.java:1359)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.widget.AbsListView$PerformClick.run(AbsListView.java:2988)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.widget.AbsListView$1.run(AbsListView.java:3783)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.os.Handler.handleCallback(Handler.java:605)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.os.Handler.dispatchMessage(Handler.java:92)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.os.Looper.loop(Looper.java:137)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at android.app.ActivityThread.main(ActivityThread.java:4517)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at java.lang.reflect.Method.invokeNative(Native Method)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at java.lang.reflect.Method.invoke(Method.java:511)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:993)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:760)
10-24 11:25:45.580: E/AndroidRuntime(29194):    at dalvik.system.NativeStart.main(Native Method)

public void loadPhotoList(){

    Cursor f = db.rawQuery("select * from stationphotos where StationObjectID =  '"+ checkStationObjectID + "'", null);  
    final ArrayList<String> mHelperNames= new ArrayList<String>();

            if(f.getCount() != 0) {
              f.moveToFirst();

                f.moveToFirst();
                while(!f.isAfterLast()) {
                    mHelperNames.add(f.getString(f.getColumnIndex("FilePath")));
                    f.moveToNext();
                }
            }
     f.close();
     final String [] nameStrings = new String [mHelperNames.size()];

     for(int i=0; i<mHelperNames.size(); i++)
        nameStrings[i] = mHelperNames.get(i).toString();


    AlertDialog.Builder builder = new AlertDialog.Builder(this);

    builder.setTitle("Select Picture");
    builder.setItems(nameStrings, new DialogInterface.OnClickListener() {

       public void onClick(DialogInterface dialog, int item) {

          loadPhoto(mHelperNames.get(item).toString());

       }

    });

    AlertDialog alert = builder.create();

    alert.show();

 }


public void loadPhoto(String imagepath){

    Dialog dialog = new Dialog(this);
    dialog.setContentView(R.layout.activity_show_image);
    dialog.setTitle("Image");
    dialog.setCancelable(true);

    ImageView img = (ImageView) dialog.findViewById(R.id.imageView1);
    img.setImageResource(R.drawable.ico_partial);
    Uri imgUri = Uri.parse(imagepath);
    img.setImageURI(imgUri);


    dialog.show();
}

---

我经历过这种情况，我不知道我的答案是否是最佳实践，但是

这可能是您的问题：

Uri imgUri = Uri.parse(imagepath);
    img.setImageURI(imgUri);

---

当我加载照片时，堆的大小达到44mb

如果你加载了一个大的图像，那么你可能会耗尽内存。此外，如果在加载一系列图像时未能使用适当的内存管理，您将耗尽内存

我使用对文件进行解码，并使用创建一个新的sclaed位图，然后显示在屏幕上

其思想是BitmapFactory.Options使您能够更好地控制图像可能使用的潜在内存。例如，不需要在甚至不支持这些分辨率的屏幕上以全尺寸显示1920x1080图像

有一些相关的stackoverflow问题可能会对您有所帮助，特别是：，重点是BitmapFactory.Options选项

inJustDecodeBounds

最后，我找到了这个名为的伟大的轻量级库。它有一整套处理大型文件的方法，到目前为止，它做得很好。很值得一看。在web开发方面，它使用了与Jquery类似的范例（因此得名），并引入了一种用于操作视图的较短语法。他们文档的以下部分涉及本地和远程源的图像加载，包括回退图像：

---

内存分析器显示什么？堆大小是多少，堆空闲内存是多少？当我加载照片时，堆的大小猛增到44mb。还有别的办法吗？1 45.258 MB 44.830 MB 438.242 KB 99.05%57128您如何知道高度和宽度是500？我真的不记得（4年前！？），但它看起来应该总是500 x 500，无论出于什么目的，我需要它-最后一行谢谢，我只是查看了位图工厂，现在我正在压缩