我有一个ListView,每行上有两个图像按钮。当用户单击列表行时,它将启动一个新活动。我不得不建立我自己的标签,因为相机布局的问题。为结果启动的活动是一个映射。如果我点击我的按钮来启动图像预览(从SD卡加载图像),应用程序从活动返回到ListView活动到结果处理程序,重新启动我的新活动,这只不过是一个图像小部件。

ListView上的图像预览是用光标和ListAdapter完成的。这使得它非常简单,但我不确定我如何可以把一个调整大小的图像(即较小的位大小而不是像素作为图像按钮的src)。我只是调整了从手机摄像头拍下来的图片的大小。

问题是,当它试图返回并重新启动第二个活动时,我得到一个OutOfMemoryError。

是否有一种方法,我可以轻松地构建列表适配器行,在那里我可以调整大小的飞行(位)?

这将是可取的,因为我还需要对每行中的小部件/元素的属性做出一些更改,因为我无法选择一行与触摸屏,因为焦点问题。(我会用滚轮。)

我知道我可以做带外调整并保存我的图像,但这不是我真正想做的,但一些示例代码会很好。

当我在ListView上禁用图像时,它又可以正常工作了。

供你参考:我是这样做的:

String[] from = new String[] { DBHelper.KEY_BUSINESSNAME, DBHelper.KEY_ADDRESS,
    DBHelper.KEY_CITY, DBHelper.KEY_GPSLONG, DBHelper.KEY_GPSLAT,
    DBHelper.KEY_IMAGEFILENAME  + ""};
int[] to = new int[] { R.id.businessname, R.id.address, R.id.city, R.id.gpslong,
    R.id.gpslat, R.id.imagefilename };
notes = new SimpleCursorAdapter(this, R.layout.notes_row, c, from, to);
setListAdapter(notes);

其中R.id.imagefilename是一个ButtonImage。

这是我的LogCat:

01-25 05:05:49.877: ERROR/dalvikvm-heap(3896): 6291456-byte external allocation too large for this process.
01-25 05:05:49.877: ERROR/(3896): VM wont let us allocate 6291456 bytes
01-25 05:05:49.877: ERROR/AndroidRuntime(3896): Uncaught handler: thread main exiting due to uncaught exception
01-25 05:05:49.917: ERROR/AndroidRuntime(3896): java.lang.OutOfMemoryError: bitmap size exceeds VM budget
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.graphics.BitmapFactory.nativeDecodeStream(Native Method)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.graphics.BitmapFactory.decodeStream(BitmapFactory.java:304)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:149)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.graphics.BitmapFactory.decodeFile(BitmapFactory.java:174)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.graphics.drawable.Drawable.createFromPath(Drawable.java:729)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.ImageView.resolveUri(ImageView.java:484)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.ImageView.setImageURI(ImageView.java:281)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.SimpleCursorAdapter.setViewImage(SimpleCursorAdapter.java:183)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.SimpleCursorAdapter.bindView(SimpleCursorAdapter.java:129)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.CursorAdapter.getView(CursorAdapter.java:150)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.AbsListView.obtainView(AbsListView.java:1057)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.ListView.makeAndAddView(ListView.java:1616)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.ListView.fillSpecific(ListView.java:1177)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.ListView.layoutChildren(ListView.java:1454)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.AbsListView.onLayout(AbsListView.java:937)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.view.View.layout(View.java:5611)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1108)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.LinearLayout.onLayout(LinearLayout.java:922)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.view.View.layout(View.java:5611)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.FrameLayout.onLayout(FrameLayout.java:294)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.view.View.layout(View.java:5611)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1119)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.LinearLayout.layoutVertical(LinearLayout.java:999)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.LinearLayout.onLayout(LinearLayout.java:920)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.view.View.layout(View.java:5611)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.widget.FrameLayout.onLayout(FrameLayout.java:294)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.view.View.layout(View.java:5611)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.view.ViewRoot.performTraversals(ViewRoot.java:771)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.view.ViewRoot.handleMessage(ViewRoot.java:1103)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.os.Handler.dispatchMessage(Handler.java:88)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.os.Looper.loop(Looper.java:123)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at android.app.ActivityThread.main(ActivityThread.java:3742)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at java.lang.reflect.Method.invokeNative(Native Method)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at java.lang.reflect.Method.invoke(Method.java:515)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:739)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:497)
01-25 05:05:49.917: ERROR/AndroidRuntime(3896):     at dalvik.system.NativeStart.main(Native Method)
01-25 05:10:01.127: ERROR/AndroidRuntime(3943): ERROR: thread attach failed 

我也有一个新的错误时显示的图像:

22:13:18.594: DEBUG/skia(4204): xxxxxxxxxxx jpeg error 20 Improper call to JPEG library in state %d
22:13:18.604: INFO/System.out(4204): resolveUri failed on bad bitmap uri: 
22:13:18.694: ERROR/dalvikvm-heap(4204): 6291456-byte external allocation too large for this process.
22:13:18.694: ERROR/(4204): VM won't let us allocate 6291456 bytes
22:13:18.694: DEBUG/skia(4204): xxxxxxxxxxxxxxxxxxxx allocPixelRef failed

当前回答

一般安卓设备堆大小只有16MB(不同设备/操作系统见后堆大小),如果你正在加载图像,它超过16MB的大小,它会抛出内存异常,而不是使用位图,从SD卡或资源甚至从网络加载图像尝试使用getImageUri,加载位图需要更多的内存,或者你可以设置位图为空,如果你的工作与该位图。

其他回答

在我的一个应用程序中,我需要从相机/画廊中拍照。如果用户从相机点击图像(可能是200万,500万或800万),图像大小从kBs到mb不等。如果图像大小较小(或高达1-2MB)以上代码工作正常,但如果我有图像的大小超过4MB或5MB,然后OOM进入帧:(

然后我努力解决这个问题,最后我对Fedor的(所有功劳都归功于Fedor,因为它是一个很好的解决方案)代码做出了以下改进:)

private Bitmap decodeFile(String fPath) {
    // Decode image size
    BitmapFactory.Options opts = new BitmapFactory.Options();
    /*
     * If set to true, the decoder will return null (no bitmap), but the
     * out... fields will still be set, allowing the caller to query the
     * bitmap without having to allocate the memory for its pixels.
     */
    opts.inJustDecodeBounds = true;
    opts.inDither = false; // Disable Dithering mode
    opts.inPurgeable = true; // Tell to gc that whether it needs free
                                // memory, the Bitmap can be cleared
    opts.inInputShareable = true; // Which kind of reference will be used to
                                    // recover the Bitmap data after being
                                    // clear, when it will be used in the
                                    // future

    BitmapFactory.decodeFile(fPath, opts);

    // The new size we want to scale to
    final int REQUIRED_SIZE = 70;

    // Find the correct scale value. 
    int scale = 1;

    if (opts.outHeight > REQUIRED_SIZE || opts.outWidth > REQUIRED_SIZE) {

        // Calculate ratios of height and width to requested height and width
        final int heightRatio = Math.round((float) opts.outHeight
                / (float) REQUIRED_SIZE);
        final int widthRatio = Math.round((float) opts.outWidth
                / (float) REQUIRED_SIZE);

        // Choose the smallest ratio as inSampleSize value, this will guarantee
        // a final image with both dimensions larger than or equal to the
        // requested height and width.
        scale = heightRatio < widthRatio ? heightRatio : widthRatio;//
    }

    // Decode bitmap with inSampleSize set
    opts.inJustDecodeBounds = false;

    opts.inSampleSize = scale;

    Bitmap bm = BitmapFactory.decodeFile(fPath, opts).copy(
            Bitmap.Config.RGB_565, false);

    return bm;

}

希望这篇文章能对面临同样问题的朋友有所帮助!

欲了解更多,请参考此

这将获得适当的位图并减少内存消耗

JAVA

Bitmap bm = null;

BitmapFactory.Options bmpOption = new BitmapFactory.Options();
bmpOption.inJustDecodeBounds = true;

FileInputStream fis = new FileInputStream(file);
BitmapFactory.decodeStream(fis, null, bmpOption);
fis.close();

int scale = 1;

if (bmpOption.outHeight > IMAGE_MAX_SIZE || bmpOption.outWidth > IMAGE_MAX_SIZE) {
    scale = (int)Math.pow(2, (int) Math.ceil(Math.log(IMAGE_MAX_SIZE / 
       (double) Math.max(bmpOption.outHeight, bmpOption.outWidth)) / Math.log(0.5)));
}

BitmapFactory.Options bmpOption2 = new BitmapFactory.Options();
bmpOption2.inSampleSize = scale;
fis = new FileInputStream(file);
bm = BitmapFactory.decodeStream(fis, null, bmpOption2);
fis.close();

科特林

val bm:Bitmap = null
val bmpOption = BitmapFactory.Options()
bmpOption.inJustDecodeBounds = true
val fis = FileInputStream(file)
BitmapFactory.decodeStream(fis, null, bmpOption)
fis.close()
val scale = 1
if (bmpOption.outHeight > IMAGE_MAX_SIZE || bmpOption.outWidth > IMAGE_MAX_SIZE)
{
  scale = Math.pow(2.0, Math.ceil((Math.log((IMAGE_MAX_SIZE / Math.max(bmpOption.outHeight, bmpOption.outWidth) as Double)) / Math.log(0.5))).toInt().toDouble()).toInt()
}
val bmpOption2 = BitmapFactory.Options()
bmpOption2.inSampleSize = scale
fis = FileInputStream(file)
bm = BitmapFactory.decodeStream(fis, null, bmpOption2)
fis.close()

避免内存泄漏或位图OOM的最佳实践

不要为一个Context / Activity保留长时间的位图引用。 如果你在你的应用程序中使用一个大的位图作为背景或其他东西,那么不要把完整的图像拉到主存中。您可以使用位图的insample size属性来获取屏幕所需的大小。 清洁位图引用一旦不再使用。

看起来你用的图片尺寸很大。所以一些旧的设备崩溃是因为堆内存满了。在旧设备(蜂窝或ICS或任何低端型号设备)尝试使用android:largeHeap="true"在清单文件下的应用程序标签或通过使用下面的代码减少位图的大小。

Bitmap bMap;
BitmapFactory.Options options = new BitmapFactory.Options(); 
options.InSampleSize = 8;
bMap= BitmapFactory.DecodeFile(imgFile.AbsolutePath, options);

你也可以给4或12或16来减少位图的大小

一般安卓设备堆大小只有16MB(不同设备/操作系统见后堆大小),如果你正在加载图像,它超过16MB的大小,它会抛出内存异常,而不是使用位图,从SD卡或资源甚至从网络加载图像尝试使用getImageUri,加载位图需要更多的内存,或者你可以设置位图为空,如果你的工作与该位图。