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android – 即使向左移动Seekbar的滚动条,图像的亮度也会不断增加

作者:互联网

在我的应用程序中,我希望能够在ImageView中更改图像的亮度.我为此目的使用了搜索栏.当我向右移动滚动条时,它会改变图像的亮度,但是当我想降低亮度并向左移动时,亮度会不断增加,图像会变得近乎白色.此外,使用搜索栏作为用户非常困难.它移动得不是很顺利.有人可以帮助我改进我的代码,因为我是编程的初学者.

以下是代码的一部分:

点击“过滤器”按钮:

btn_filter.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
      Log.e("EditPhoto", "counter value = " + counter);
      counter++;
      sbarBrightness = (SeekBar) findViewById(R.id.seekBarForBrightness);
        if (counter % 2 == 0) {
            sbarBrightness.setVisibility(View.INVISIBLE);
        } else {
            sbarBrightness.setVisibility(View.VISIBLE);
        }
    sbarBrightness.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
     int brightness;
     @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean
                                          fromUser) {

    brightness = progress;
    imageBitmap = doBrightness(imageBitmap, brightness);
    putGestureImageOnScreen(imageBitmap);
 }
   });
  }
 });

public static Bitmap doBrightness(Bitmap src, int value) {
    Log.e("Brightness", "Changing brightnhjh");

    int width = src.getWidth();
    int height = src.getHeight();
    Bitmap bmout = Bitmap.createBitmap(width, height, src.getConfig());
    int A, R, G, B;
    int pixel;
    for (int i = 0; i < width; ++i) {
        for (int j = 0; j < height; ++j) {
            pixel = src.getPixel(i, j);
            A = Color.alpha(pixel);
            R = Color.red(pixel);
            G = Color.green(pixel);
            B = Color.blue(pixel);
            R += value;
            if (R > 255) {
                R = 255;
            } else if (R < 0) {
                R = 0;
            }
            G += value;
            if (G > 255) {
                G = 255;
            } else if (G < 0) {
                G = 0;
            }
            B += value;
            if (B > 255) {
                B = 255;
            } else if (B < 0) {
                B = 0;
            }
            bmout.setPixel(i, j, Color.argb(A, R, G, B));
        }
    }
    return bmout;

}

Seekbar在布局中的声明:

<SeekBar
    android:id="@+id/seekBarForBrightness"
    android:layout_width="500dp"
    android:layout_height="50dp"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    style="@style/tallerBarStyle"        
    android:layout_marginTop="64dp"
    android:visibility="invisible" />

它的风格如下:

<style name="tallerBarStyle" parent="@android:style/Widget.SeekBar">
    <item name="android:indeterminateOnly">false</item>
    <item name="android:progressDrawable">@android:drawable/progress_horizontal</item>
    <item
     name="android:indeterminateDrawable">@android:drawable/progress_horizontal</item>
    <item name="android:minHeight">8dip</item>
    <item name="android:maxHeight">10dip</item>
</style>

另外,我想保存图像的亮度级别,这样当我将图像传递给另一个活动时,亮度不会丢失.有人可以指导我,我怎样才能实现它.

谢谢.

解决方法:

该问题是由对相同的Bitmap引用进行操作引起的(imageBitmap = doBrightness(imageBitmap,brightness);).因此,当您将滑块向左拖动时,您仍然会不断增加图像的亮度.

尝试

brightness = progress;
//imageBitmap = doBrightness(imageBitmap, brightness);
putGestureImageOnScreen(doBrightness(imageBitmap, brightness));

对于第二个问题,您可以使用Intent将亮度值传输到下一个Activity并执行亮度操作一次以获得相同的结果.

标签:android,android-activity,android-imageview,android-seekbar,brightness
来源: https://codeday.me/bug/20190703/1365709.html