这真的很令人沮丧——尽管我回收了位图并使用了垃圾收集器，但我的应用程序中出现了某种内存泄漏。在我的应用程序中，我有一个列表视图，当单击子项时，几个图像会加载到alerdialogbuilder 和滚动视图中。我在滚动视图中没有超过 9 张图像，过了一会儿我得到了内存不足的异常。除了回收位图，我还能做什么？例如，我是否应该创建图像视图的弱引用，以便垃圾收集器可以处理它们？
我将所有内容放在扩展 Asynctask 的类中，并在 do-in-background-method 中调用另一个方法，以便有效地缩小图像。然后将图像发送到 onPostExecute(Bitmap[] bitmap) 方法，然后将它们放入滚动视图中。泄漏点在哪里？我的 Galaxy s3 的堆大小为 64 mb，仅加载 9 张图像后，内存使用量飙升至 42 mb，然后再单击至 47 mb ......然后什么都没有发生奇怪......我想，好吧.. 很好，它停在这里在 47 mb 上......但在再点击 10 次后，内存使用量继续攀升至 55 mb .. 依此类推，直到应用程序崩溃。
我通过在清单文件中设置 large-heap = true 暂时解决了它。但我不喜欢推迟问题！
我也无法理解为什么 9 张图像的内存使用量如此之大。在缩小之前，图像的平均大小约为 250kb。
非常感谢帮助！！！:-)
class BitmapWorkerTask extends AsyncTask <Integer, Void, Bitmap[]> {
private int[] data;
private int[] width, height;
private int nmbrOfImages;
private String[] scrollText;
private ImageView mImage;
private View view;
private LayoutInflater factory;
private AlertDialog.Builder alertadd;
public BitmapWorkerTask(int[] width, int[] height, int nmbrOfImages, String[] scrollText) {
this.width = width;
this.height = height;
this.nmbrOfImages = nmbrOfImages;
this.scrollText = scrollText;
mImage = null;
view = null;
factory = null;
alertadd = null;
System.gc();
try {
for (int i = 0; i < scaledBitmap.length; i++) {
scaledBitmap[i].recycle();
System.out.println("i: " + i);
}
} catch (NullPointerException ne) {
System.out.println("nullpointerexception ... gick inte recycla bitmapbilder");
}
switch (nmbrOfImages) {
case 0:
data = new int[1];
break;
case 1:
data = new int[3];
break;
case 2:
data = new int[5];
break;
case 3:
data = new int[9];
break;
}
}
@Override
protected Bitmap[] doInBackground(Integer ... params) {
switch (nmbrOfImages) {
case 0:
data[0] = params[0];
break;
case 1:
data[0] = params[0];
data[1] = params[1];
data[2] = params[2];
break;
case 2:
data[0] = params[0];
data[1] = params[1];
data[2] = params[2];
data[3] = params[3];
data[4] = params[4];
break;
case 3:
data[0] = params[0];
data[1] = params[1];
data[2] = params[2];
data[3] = params[3];
data[4] = params[4];
data[5] = params[5];
data[6] = params[6];
data[7] = params[7];
data[8] = params[8];
break;
}
alertadd = new AlertDialog.Builder(context);
factory = LayoutInflater.from(context);
return decodeSampledBitmapFromResource(context.getResources(), data, width, height);
}
protected void onPostExecute(Bitmap[] bitmap) {
switch (nmbrOfImages) {
case 0:
if (view == null) {
view = factory.inflate(R.layout.alertviews, null);
}
ImageView mImage = (ImageView) view.findViewById(R.id.extra_img);
mImage.setImageBitmap(bitmap[0]);
alertadd.setView(view);
alertadd.setNeutralButton("Here!", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dlg, int sumthin) {
}
});
alertadd.show();
break;
case 1:
if (view == null) {
view = factory.inflate(R.layout.alertviews2, null);
}
mImage = (ImageView) view.findViewById(R.id.img1);
mImage.setImageBitmap(bitmap[0]);
mImage = (ImageView) view.findViewById(R.id.img2);
mImage.setImageBitmap(bitmap[1]);
mImage = (ImageView) view.findViewById(R.id.img3);
mImage.setImageBitmap(bitmap[2]);
try {
TextView mText2 = (TextView) view.findViewById(R.id.text_img1_scrollview);
mText2.setText(scrollText[0]);
mText2 = (TextView) view.findViewById(R.id.text_img2_scrollview);
mText2.setText(scrollText[1]);
mText2 = (TextView) view.findViewById(R.id.text_img3_scrollview);
mText2.setText(scrollText[2]);
} catch (NullPointerException ne) {
System.out.println("nullpointerexception ... TextView i metoden onPostExecute");
}
alertadd.setView(view);
alertadd.setNeutralButton("Here!", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dlg, int sumthin) {
}
});
alertadd.show();
break;
case 2:
if (view == null) {
view = factory.inflate(R.layout.alertviews3, null);
}
mImage = (ImageView) view.findViewById(R.id.img1);
mImage.setImageBitmap(bitmap[0]);
mImage = (ImageView) view.findViewById(R.id.img2);
mImage.setImageBitmap(bitmap[1]);
mImage = (ImageView) view.findViewById(R.id.img3);
mImage.setImageBitmap(bitmap[2]);
mImage = (ImageView) view.findViewById(R.id.img4);
mImage.setImageBitmap(bitmap[3]);
mImage = (ImageView) view.findViewById(R.id.img5);
mImage.setImageBitmap(bitmap[4]);
try {
TextView mText3 = (TextView) view.findViewById(R.id.text_img1_scrollview);
mText3.setText(scrollText[0]);
mText3 = (TextView) view.findViewById(R.id.text_img2_scrollview);
mText3.setText(scrollText[1]);
mText3 = (TextView) view.findViewById(R.id.text_img3_scrollview);
mText3.setText(scrollText[2]);
mText3 = (TextView) view.findViewById(R.id.text_img4_scrollview);
mText3.setText(scrollText[3]);
mText3 = (TextView) view.findViewById(R.id.text_img5_scrollview);
mText3.setText(scrollText[4]);
} catch (NullPointerException ne) {
System.out.println("nullpointerexception ... TextView i metoden onPostExecute");
}
alertadd.setView(view);
alertadd.setNeutralButton("Here!", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dlg, int sumthin) {
}
});
alertadd.show();
break;
case 3:
if (view == null) {
view = factory.inflate(R.layout.alertviews4, null);
}
AlertDialog.Builder alertadd = new AlertDialog.Builder(context);
mImage = (ImageView) view.findViewById(R.id.img1);
mImage.setImageBitmap(bitmap[0]);
mImage = (ImageView) view.findViewById(R.id.img2);
mImage.setImageBitmap(bitmap[1]);
mImage = (ImageView) view.findViewById(R.id.img3);
mImage.setImageBitmap(bitmap[2]);
mImage = (ImageView) view.findViewById(R.id.img4);
mImage.setImageBitmap(bitmap[3]);
mImage = (ImageView) view.findViewById(R.id.img5);
mImage.setImageBitmap(bitmap[4]);
mImage = (ImageView) view.findViewById(R.id.img6);
mImage.setImageBitmap(bitmap[5]);
mImage = (ImageView) view.findViewById(R.id.img7);
mImage.setImageBitmap(bitmap[6]);
mImage = (ImageView) view.findViewById(R.id.img8);
mImage.setImageBitmap(bitmap[7]);
mImage = (ImageView) view.findViewById(R.id.img9);
mImage.setImageBitmap(bitmap[8]);
try {
TextView mText4 = (TextView) view.findViewById(R.id.text_img1_scrollview);
mText4.setText(scrollText[0]);
mText4 = (TextView) view.findViewById(R.id.text_img2_scrollview);
mText4.setText(scrollText[1]);
mText4 = (TextView) view.findViewById(R.id.text_img3_scrollview);
mText4.setText(scrollText[2]);
mText4 = (TextView) view.findViewById(R.id.text_img4_scrollview);
mText4.setText(scrollText[3]);
mText4 = (TextView) view.findViewById(R.id.text_img5_scrollview);
mText4.setText(scrollText[4]);
mText4 = (TextView) view.findViewById(R.id.text_img6_scrollview);
mText4.setText(scrollText[5]);
mText4 = (TextView) view.findViewById(R.id.text_img7_scrollview);
mText4.setText(scrollText[6]);
mText4 = (TextView) view.findViewById(R.id.text_img8_scrollview);
mText4.setText(scrollText[7]);
mText4 = (TextView) view.findViewById(R.id.text_img9_scrollview);
mText4.setText(scrollText[8]);
} catch (NullPointerException ne) {
System.out.println("nullpointerexception ... TextView i metoden onPostExecute");
}
alertadd.setView(view);
alertadd.setNeutralButton("Here!", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dlg, int sumthin) {
}
});
alertadd.show();
break;
}
}
}