安卓是一个调整位图亮度的搜索栏

Question

我尝试了许多代码，并研究了Android开发人员，但无法使其工作。我希望搜索栏调整我的位图图像亮度

Answer 1

检查图像亮度增加/减少中给出的示例

并在搜索栏上按如下所示进行进度更改

 int brightness;
 SeekBar seekbarbrightness=(SeekBar)findViewById(R.id.seekBar1);
 seekbarbrightness.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
         @Override
         public void onStopTrackingTouch(SeekBar arg0) {
          // TODO Auto-generated method stub
         }
         @Override
         public void onStartTrackingTouch(SeekBar arg0) {
          // TODO Auto-generated method stub
         }
         @Override
         public void onProgressChanged(SeekBar arg0, int progress, boolean arg2) {
             // TODO Auto-generated method stub
             brightness=progress;
             Bitmap bitmap=doBrightness(originalbitmap,brightness);
             imageView.setImageBitmap(bitmap);
         }
        });

Answer 2

检查图像亮度增加/减少中给出的示例

     int brightness;
 SeekBar seekBarBrightness=(SeekBar)findViewById(R.id.seekBar1);
 seekBarBrightness.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
     @Override
     public void onStopTrackingTouch(SeekBar arg0) {

     }
     @Override
     public void onStartTrackingTouch(SeekBar arg0) {

     }
     @Override
     public void onProgressChanged(SeekBar arg0, int progress, boolean arg2) {
       Bitmap newBitMap  =   doBrightness(bitMap,progress);
       imageView.setImageBitmap(newBitMap);
     }
    });


    public static Bitmap doBrightness(Bitmap src, int value)
    {
        // image size
        int width = src.getWidth();
        int height = src.getHeight();
        // create output bitmap
        Bitmap bmOut = Bitmap.createBitmap(width, height, src.getConfig());
        // color information
        int A, R, G, B;
        int pixel;
        // scan through all pixels
        for (int x = 0; x < width; ++x)
            {
                for (int y = 0; y < height; ++y)
                    {
                        // get pixel color
                        pixel = src.getPixel(x, y);
                        A = Color.alpha(pixel);
                        R = Color.red(pixel);
                        G = Color.green(pixel);
                        B = Color.blue(pixel);
                        // increase/decrease each channel
                        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;
                            }
                        // apply new pixel color to output bitmap
                        bmOut.setPixel(x, y, Color.argb(A, R, G, B));
                    }
            }
        // return final image
        return bmOut;
    }

Answer 3

使用此示例

SeekBar sb_value = (SeekBar) findViewById(R.id.sb_value);
        final ImageView im_brightness = (ImageView) findViewById(R.id.im_brightness);
        sb_value.setProgress(125);
        sb_value.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                im_brightness.setColorFilter(setBrightness(progress));
            }
            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
            }
            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
            }
        });

setBrightness方法：

public static PorterDuffColorFilter setBrightness(int progress) {
        if (progress >=    100)
        {
            int value = (int) (progress-100) * 255 / 100;
            return new PorterDuffColorFilter(Color.argb(value, 255, 255, 255), PorterDuff.Mode.SRC_OVER);
        }
        else
        {
            int value = (int) (100-progress) * 255 / 100;
            return new PorterDuffColorFilter(Color.argb(value, 0, 0, 0), PorterDuff.Mode.SRC_ATOP);

        }
    }

Answer 4

除了Ragu Ram具有平滑搜索条性能外。对于Kotlin

    val seekBarBrightness : SeekBar = findViewById(R.id.seekBarBrightness)
    seekBarBrightness.max = 255
    seekBarBrightness.min = -255
    seekBarBrightness.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
        override fun onProgressChanged(seekBar: SeekBar, progress: Int,
                                       fromUser: Boolean) {
            imageView.colorFilter = setBrightness(progress)
        }
        override fun onStartTrackingTouch(seekBar: SeekBar) {
        }
        override fun onStopTrackingTouch(seekBar: SeekBar) {
        }
    })

设置亮度

fun setBrightness(progress : Int): PorterDuffColorFilter {
    return if (progress >= 0) {
        PorterDuffColorFilter(Color.argb(progress, 255, 255, 255), PorterDuff.Mode.SRC_OVER)
    } else {
        val value = 255 - progress
        PorterDuffColorFilter(Color.argb(value, 0, 0, 0), PorterDuff.Mode.SRC_ATOP)
    }
}