下载影像看起来非常模糊 [英] Downloaded Image Appears very blurry

问题描述

我下载的图像使用以下这个优秀文章。我自己的形象我使用的是谷歌地图的静态图像是300x400。我一直拨弄几的设置，并扩大其在屏幕上，以填补，但它只是似乎很模糊。

I downloaded an image to use following this excellent article. My own image I'm using is a google map static image that is 300x400. I've fiddle with a few of the settings and have expanded it to fill across the screen, however it just appears very blurry.

<ImageView
    android:id="@+id/image"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:layout_x="0dp"
    android:layout_y="0dp"
    android:adjustViewBounds="true"
    android:clickable="false"
    android:gravity="center_vertical"
    android:longClickable="false"
    android:scaleType="fitCenter" />

这是我在屏幕XML布局。这是一个常见的​​问题？我做了一个很好的搜索，但没有找到答案。是不是300x400 Android的一个很好的资源？

That is what I have in the screen xml layout. Is this a common problem? I did a good search and couldn't find an answer. Is 300x400 not a good res for android?

推荐答案

我找到了原因，他们是低，图像加载器类有一个内置的COM pression：

I found the reason why they were low, the image loader class had a built in compression:

//decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f){
    try {
        //decode image size
        BitmapFactory.Options o = new BitmapFactory.Options();
        o.inJustDecodeBounds = true;
        BitmapFactory.decodeStream(new FileInputStream(f),null,o);

        //Find the correct scale value. It should be the power of 2.
        final int REQUIRED_SIZE=70;
        int width_tmp=o.outWidth, height_tmp=o.outHeight;
        int scale=1;
        while(true){
            if(width_tmp/2<REQUIRED_SIZE || height_tmp/2<REQUIRED_SIZE)
                break;
            width_tmp/=2;
            height_tmp/=2;
            scale*=2;
        }

        //decode with inSampleSize
        BitmapFactory.Options o2 = new BitmapFactory.Options();
        o2.inSampleSize=scale;
        return BitmapFactory.decodeStream(new FileInputStream(f), null, o2);
    } catch (FileNotFoundException e) {}
    return null;
}

所以你留下了

所以才删除此部分：

So just remove this part so you are left with:

//decodes image and scales it to reduce memory consumption
private Bitmap decodeFile(File f){

  try {
    return BitmapFactory.decodeStream(new FileInputStream(f));
} catch (FileNotFoundException e) {
    e.printStackTrace();
}
return null;

}

清晰的图像。

这篇关于下载影像看起来非常模糊的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！