如何减少android中的内存消耗

How to reduce memory consumption in android

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Possible Duplicate:
Android: Strange out of memory issue while loading an image to a Bitmap object

我是android领域的新手。我不知道如何减少android中的内存消耗。在我的应用程序中，从Web绘制大量图像并显示到网格视图中。运行应用程序时"出现内存问题"。

请帮我

1)缩小尺寸并缩小图像尺寸

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/**
* decodes image and scales it to reduce memory consumption
*
* @param file
* @param requiredSize
* @return
*/
public static Bitmap decodeFile(File file, int requiredSize) {
try {

// Decode image size
BitmapFactory.Options o = new BitmapFactory.Options();
o.inJustDecodeBounds = true;
BitmapFactory.decodeStream(new FileInputStream(file), null, o);

// The new size we want to scale to

// Find the correct scale value. It should be the power of 2.
int width_tmp = o.outWidth, height_tmp = o.outHeight;
int scale = 1;
while (true) {
if (width_tmp / 2 < requiredSize
|| height_tmp / 2 < requiredSize)
break;
width_tmp /= 2;
height_tmp /= 2;
scale *= 2;
}

// Decode with inSampleSize
BitmapFactory.Options o2 = new BitmapFactory.Options();
o2.inSampleSize = scale;

Bitmap bmp = BitmapFactory.decodeStream(new FileInputStream(file),
null, o2);

return bmp;

} catch (FileNotFoundException e) {
} finally {
}
return null;
}

2)使用bitmap.Recycle();

3)使用System.gc();向VM指示运行垃圾收集器的好时机