java Android保留一个位图作为更改色调、对比度、饱和度等的源
我正在安卓应用程序中开发一个功能，用户可以使用SeekBar修改位图的饱和度、色调、对比度等。我为每个处理编写了不同的方法。这可以单独工作，但如果我更改位图的色调，并且在调用任何其他方法（例如饱和度）之前，我希望使用应用的色调进度等保留位图。如果进度设置为默认值，用户应该能够看到原始位图
比如说,， 如果我将位图的色调值更改为200。现在，如果我想编辑饱和度的新位图的饱和度应该与应用色调。如果我将饱和度和色调进度重置为默认值，那么用户应该能够看到原始位图颜色
我尝试了许多方法来实现这种行为，例如在每次方法调用之前复制像素，但都没有帮助。目前，对于每种位图处理类型，我只是在用户单击时将修改后的位图的像素复制到原始位图，但如果我重置所有值，则不会将位图更改为原始颜色。请看我的密码
我希望这将有助于理解这个问题
private Bitmap wallpaper, modifiedWallpaper;
private ImageView imageView;
private ImageButton contrast;
private ImageButton hue;
private ImageButton saturation;
private float contrastProgress;
private float hueProgress;
private float satProgress;
private boolean isBlur, isBright, isContrast;
private boolean isHue, isSaturation, isRGB;
private TextView currentMode;
private SeekBar seekBar;
private Paint paint;
private Canvas canvas;
private CardView editor;
@Override
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_customize_wallpaper, container, false);
imageView = view.findViewById(R.id.wallpaper);
rgbContainer = view.findViewById(R.id.rgb);
close = view.findViewById(R.id.close);
currentMode = view.findViewById(R.id.current_mode);
seekBar = view.findViewById(R.id.seekBar);
seekBar.setOnSeekBarChangeListener(seekBarChangeListener);
contrast = view.findViewById(R.id.contrast);
hue = view.findViewById(R.id.hue);
saturation = view.findViewById(R.id.saturation);
contrast.setOnClickListener(this);
hue.setOnClickListener(this);
saturation.setOnClickListener(this);
satProgress = 256f;
loadWallpaper(final String wallpaperUrl);
return view;
}
private void loadWallpaper(final String wallpaperUrl) {
Picasso.get().load(Constants.DOMAIN + wallpaperUrl).into(new Target() {
@Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
wallpaper = bitmap; //original loaded
modifiedWallpaper = wallpaper.copy(Bitmap.Config.ARGB_8888, true);
imageView.setImageBitmap(wallpaper);
}
@Override
public void onBitmapFailed(Exception e, Drawable errorDrawable) {
}
@Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
}
});
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.contrast : {
wallpaper = modifiedWallpaper.copy(Bitmap.Config.ARGB_8888, true);
isBlur = false;
isBright = false;
isContrast = true;
isHue = false;
isSaturation = false;
isRGB = false;
seekBar.setVisibility(View.VISIBLE);
rgbContainer.setVisibility(View.GONE);
changeIconTint();
seekBar.setOnSeekBarChangeListener(null);
seekBar.setMax(90);
seekBar.setProgress((int) contrastProgress);
seekBar.setOnSeekBarChangeListener(seekBarChangeListener);
currentMode.setText("Contrast");
break;
}
case R.id.hue : {
wallpaper = modifiedWallpaper.copy(Bitmap.Config.ARGB_8888, true);
isBlur = false;
isBright = false;
isContrast = false;
isHue = true;
isSaturation = false;
isRGB = false;
seekBar.setVisibility(View.VISIBLE);
rgbContainer.setVisibility(View.GONE);
changeIconTint();
seekBar.setOnSeekBarChangeListener(null);
seekBar.setMax(180);
seekBar.setProgress((int) hueProgress);
seekBar.setOnSeekBarChangeListener(seekBarChangeListener);
currentMode.setText("Hue");
break;
}
case R.id.saturation : {
wallpaper = modifiedWallpaper.copy(Bitmap.Config.ARGB_8888, true);
isBlur = false;
isBright = false;
isContrast = false;
isHue = false;
isSaturation = true;
isRGB = false;
seekBar.setVisibility(View.VISIBLE);
rgbContainer.setVisibility(View.GONE);
changeIconTint();
seekBar.setOnSeekBarChangeListener(null);
seekBar.setMax(512);
seekBar.setProgress((int) satProgress);
seekBar.setOnSeekBarChangeListener(seekBarChangeListener);
currentMode.setText("Saturation");
break;
}
}
}
private void changeContrast(float contrastProgress) {
float cb = this.contrastProgress == 0 ? 0 : -(this.contrastProgress / 1.8f) * 5;
ColorMatrix cm = new ColorMatrix(new float[]
{
contrastProgress, 0, 0, 0, cb,
0, contrastProgress, 0, 0, cb,
0, 0, contrastProgress, 0, cb,
0, 0, 0, contrastProgress, 0
});
paint = new Paint();
paint.setColorFilter(new ColorMatrixColorFilter(cm));
modifiedWallpaper = wallpaper.copy(Bitmap.Config.ARGB_8888, true);
canvas = new Canvas(modifiedWallpaper);
canvas.drawBitmap(modifiedWallpaper, 0, 0, paint);
imageView.setImageBitmap(modifiedWallpaper);
}
private void changeHue() {
ColorMatrix cm = new ColorMatrix();
float hueProgress = cleanValue() / 90f * (float) Math.PI;
if (hueProgress == 0){
return;
}
float cosVal = (float) Math.cos(hueProgress);
float sinVal = (float) Math.sin(hueProgress);
float lumR = 0.213f;
float lumG = 0.715f;
float lumB = 0.072f;
float[] mat = new float[]
{//logic };
cm.postConcat(new ColorMatrix(mat));
paint = new Paint();
paint.setColorFilter(new ColorMatrixColorFilter(cm));
modifiedWallpaper = wallpaper.copy(Bitmap.Config.ARGB_8888, true);
canvas = new Canvas(modifiedWallpaper);
canvas.drawBitmap(modifiedWallpaper, 0, 0, paint);
imageView.setImageBitmap(modifiedWallpaper);
}
private void changeSaturation() {
ColorMatrix colorMatrix = new ColorMatrix();
colorMatrix.setSaturation(satProgress / 256);
paint = new Paint();
paint.setColorFilter(new ColorMatrixColorFilter(colorMatrix));
modifiedWallpaper = wallpaper.copy(Bitmap.Config.ARGB_8888, true);
canvas = new Canvas(modifiedWallpaper);
canvas.drawBitmap(modifiedWallpaper, 0, 0, paint);
imageView.setImageBitmap(modifiedWallpaper);
}
private SeekBar.OnSeekBarChangeListener seekBarChangeListener = new SeekBar.OnSeekBarChangeListener()
{
@Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
if (isContrast) {
contrastProgress = seekBar.getProgress();
Log.d("Contrast", "" + (int) contrastProgress);
changeContrast((float) (seekBar.getProgress() + 10) / 10);
return;
}
if (isHue) {
hueProgress = seekBar.getProgress();
Log.d("Hue", "" + (int) hueProgress);
changeHue();
return;
}
if (isSaturation) {
satProgress = seekBar.getProgress();
Log.d("Saturation", "" + (int) satProgress);
changeSaturation();
}
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
};
# 1 楼答案
应用筛选器时未保存状态。您可以创建一个new
Paint，其中包含一个newColorMatrix和一个newBitmap。这就是为什么一个过滤器会覆盖上一个过滤器有几种方法可以解决这个问题。我认为最好的第一步是将“过滤”与“绘图”功能分开。示例：
changeSaturation()在您的代码中，不仅会更改饱和度，还会将其绘制到屏幕上。 我是这样做的：这只是一种方法。可能是最简单的一个。如果不希望每次滑块移动时都创建所有过滤器，可以为每个过滤器保留三个不同的
matrix一个，每次只修改其中一个我还没有亲自测试过这段代码，您可能需要做一些更改，但我希望这会让您走上正确的方向