我正在使用一个对话框在我的 android 项目中显示图像。第一个打开正常，但是当我关闭它并再次执行该过程以显示不同的应用时，应用程序因内存错误而崩溃（它在三星 Galaxy s3 上运行 - 所以应该不是问题）。
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)
加载代码：
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();
}
编辑：我现在用来使它工作的东西：
public static Bitmap decodeSampledBitmapFromFile(String imagePath, int reqWidth, int reqHeight) {
// First decode with inJustDecodeBounds=true to check dimensions
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(imagePath, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFile(imagePath, options);
}
public static int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
// Raw height and width of image
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
if (width > height) {
inSampleSize = Math.round((float)height / (float)reqHeight);
} else {
inSampleSize = Math.round((float)width / (float)reqWidth);
}
}
return inSampleSize;
}
img.setImageBitmap(decodeSampledBitmapFromFile(imagepath, 500, 500));