ImageView Android 内存

发布于 2024-10-23 14:38:53 字数 1014 浏览 1 评论 0原文

我原来的问题的后续内容。

有没有一种方法可以在 Android 应用程序中使用 ImageViews 而不使用大量 RAM？

在原来的问题中，我发现我的应用程序使用了大量 RAM，并发现它是我也使用了所有 RAM 的 ImageView。

为了获取我使用的图像，

public void addPictureOnClick(View view){
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(intent, "Select Picture"),1);
    } 

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_OK) {
        if (requestCode == 1) {
            // currImageURI is the global variable I'm using to hold the content:// URI of the image
            Uri currImageURI = data.getData();                
            image.setImageURI(currImageURI);
        }

我想知道是否有其他方法来显示图片而不是 URI？

原文

A followup from my original question.

Is there a way to use ImageViews in android apps without using a lot of RAM?

In the original question I found that my app used a lot of RAM, and found that it was the ImageViews which I used that too up all the RAM.

To get the Image I use

public void addPictureOnClick(View view){
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(intent, "Select Picture"),1);
    } 

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (resultCode == RESULT_OK) {
        if (requestCode == 1) {
            // currImageURI is the global variable I'm using to hold the content:// URI of the image
            Uri currImageURI = data.getData();                
            image.setImageURI(currImageURI);
        }

I would like to know if there is another way to show pictures rather than the URI?

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檐上三寸雪 2024-10-30 14:38:53

您可以缩放图片：

BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 2;
imageViewFIeld.setImageBitmap(BitmapFactory.decodeByteArray(image, 0, image.length, options));

如果图像较大，缩放过程可能会更长，但显示时的内存负载会较低。

编辑：inSampleSize 值增加得越多，花费的时间就越多，内存使用量就越少。

inSampleSize 文档：如果设置
到一个值> 1、请求解码器
对原始图像进行二次采样，
返回较小的图像进行保存
记忆。样本量是数量
任一维度的像素数
对应于单个像素
解码的位图。例如，
inSampleSize == 4 返回图像
即宽度/高度的 1/4
原来的，和1/16的数量
像素。任何值 <= 1 都被视为
与1相同。注意：解码器将尝试
来满足这个要求，但是
结果位图可能有不同的
尺寸正是有
被要求。另外，2 的幂是
解码器通常更快/更容易
荣誉。

http://developer.android.com/reference/android/graphics /BitmapFactory.Options.html#inSampleSize

You can scale your pictures :

BitmapFactory.Options options = new BitmapFactory.Options();
options.inSampleSize = 2;
imageViewFIeld.setImageBitmap(BitmapFactory.decodeByteArray(image, 0, image.length, options));

The scaling process could be longer if you have big images, but the memory load will be lower on display.

Edit: More you increase the inSampleSize value, more times it take, less memory usage you will have.

inSampleSize documentation : If set
to a value > 1, requests the decoder
to subsample the original image,
returning a smaller image to save
memory. The sample size is the number
of pixels in either dimension that
correspond to a single pixel in the
decoded bitmap. For example,
inSampleSize == 4 returns an image
that is 1/4 the width/height of the
original, and 1/16 the number of
pixels. Any value <= 1 is treated the
same as 1. Note: the decoder will try
to fulfill this request, but the
resulting bitmap may have different
dimensions that precisely what has
been requested. Also, powers of 2 are
often faster/easier for the decoder to
honor.