Я пытаюсь создать приложение для тестирования дисплея. Redmi Mobile - тестовый экран дисплеяShot 
Для этого я использую Canvas. Вы можете проверить код ниже для получения более подробной информации.
Я пытаюсь использовать эту функцию, но приложение застряло во время выполнения этого кода
boolean CheckPixelColor() {
DisplayMetrics displayMetrics = new DisplayMetrics();
((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
int height = displayMetrics.heightPixels;
int width = displayMetrics.widthPixels;
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
if (bitmapData.getPixel(i, j) == Color.MAGENTA) {
System.out.println("Not Done");
return false;
}
}
}
return true;
}
Этот код работает. Этот код предназначен для создания пути во время инициализации и удаления его позже.
public class DrawingView extends View {
private static final float TOUCH_TOLERANCE = 4;
private Bitmap bitmap;
private Canvas canvas;
private Path path;
private Paint bitmapPaint;
private Paint paint;
private boolean drawMode;
private float x, y;
private float penSize = 20;
private float eraserSize = 50;
private Bitmap bitmapData;
Context context;
public DrawingView(Context c) {
this(c, null);
}
public DrawingView(Context c, AttributeSet attrs) {
this(c, attrs, 0);
}
public DrawingView(Context c, AttributeSet attrs, int defStyle) {
super(c, attrs, defStyle);
this.context = c;
init();
}
private void init() {
path = new Path();
bitmapPaint = new Paint(Paint.DITHER_FLAG);
paint = new Paint();
paint.setAntiAlias(true);
paint.setDither(true);
paint.setColor(Color.BLACK);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeCap(Paint.Cap.ROUND);
paint.setStrokeWidth(penSize);
drawMode = true;
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SCREEN));
this.setDrawingCacheEnabled(true);
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
if (bitmap == null) {
bitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
}
canvas = new Canvas(bitmap);
canvas.drawColor(Color.TRANSPARENT);
Init();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
canvas.drawBitmap(bitmap, 0, 0, bitmapPaint);
canvas.drawPath(path, paint);
bitmapData = this.getDrawingCache(true);
}
private void touchStart(float x, float y) {
path.reset();
path.moveTo(x, y);
this.x = x;
this.y = y;
canvas.drawPath(path, paint);
}
private void touchMove(float x, float y) {
float dx = Math.abs(x - this.x);
float dy = Math.abs(y - this.y);
if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
path.quadTo(this.x, this.y, (x + this.x) / 2, (y + this.y) / 2);
this.x = x;
this.y = y;
}
canvas.drawPath(path, paint);
}
private void touchUp() {
path.lineTo(x, y);
canvas.drawPath(path, paint);
path.reset();
if (drawMode) {
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SCREEN));
} else {
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (!drawMode) {
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
} else {
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SCREEN));
}
touchStart(x, y);
invalidate();
break;
case MotionEvent.ACTION_MOVE:
touchMove(x, y);
if (!drawMode) {
path.lineTo(this.x, this.y);
path.reset();
path.moveTo(x, y);
}
canvas.drawPath(path, paint);
invalidate();
break;
case MotionEvent.ACTION_UP:
touchUp();
invalidate();
break;
default:
break;
}
return true;
}
public void initializePen() {
drawMode = true;
paint.setAntiAlias(true);
paint.setDither(true);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeCap(Paint.Cap.ROUND);
paint.setStrokeWidth(penSize);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.SCREEN));
}
public void initializeEraser() {
drawMode = false;
paint.setColor(Color.parseColor("#f4f4f4"));
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(eraserSize);
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
}
public void clear() {
canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR);
invalidate();
}
@Override
public void setBackgroundColor(int color) {
if (canvas == null) {
canvas = new Canvas();
}
canvas.drawColor(color);
super.setBackgroundColor(color);
}
public void setEraserSize(float size) {
eraserSize = size;
initializeEraser();
}
public void setPenSize(float size) {
penSize = size;
initializePen();
}
public float getEraserSize() {
return eraserSize;
}
public float getPenSize() {
return penSize;
}
public void setPenColor(@ColorInt int color) {
paint.setColor(color);
}
public @ColorInt
int getPenColor() {
return paint.getColor();
}
public void loadImage(Bitmap bitmap) {
this.bitmap = bitmap.copy(Bitmap.Config.ARGB_8888, true);
canvas.setBitmap(this.bitmap);
bitmap.recycle();
invalidate();
}
public boolean saveImage(String filePath, String filename, Bitmap.CompressFormat format,
int quality) {
if (quality > 100) {
Log.d("saveImage", "quality cannot be greater that 100");
return false;
}
File file;
FileOutputStream out = null;
try {
switch (format) {
case PNG:
file = new File(filePath, filename + ".png");
out = new FileOutputStream(file);
return bitmap.compress(Bitmap.CompressFormat.PNG, quality, out);
case JPEG:
file = new File(filePath, filename + ".jpg");
out = new FileOutputStream(file);
return bitmap.compress(Bitmap.CompressFormat.JPEG, quality, out);
default:
file = new File(filePath, filename + ".png");
out = new FileOutputStream(file);
return bitmap.compress(Bitmap.CompressFormat.PNG, quality, out);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (out != null) {
out.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return false;
}
void Init() {
initializePen();
DisplayMetrics displayMetrics = new DisplayMetrics();
((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
int height = displayMetrics.heightPixels;
int width = displayMetrics.widthPixels;
System.out.println("height: " + height);
System.out.println("width: " + width);
path.reset();
path.moveTo(0, 0);
path.lineTo(0, height);
path.lineTo(width, height);
path.lineTo(width, 0);
path.lineTo(0, 0);
path.lineTo(width, height);
path.moveTo(width, 0);
path.lineTo(0, height);
canvas.drawPath(path, paint);
invalidate();
initializeEraser();
}
boolean CheckPixelColor() {
DisplayMetrics displayMetrics = new DisplayMetrics();
((Activity) context).getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
int height = displayMetrics.heightPixels;
int width = displayMetrics.widthPixels;
for (int i = 0; i < width; i++) {
for (int j = 0; j < height; j++) {
if (bitmapData.getPixel(i, j) == Color.MAGENTA) {
System.out.println("Not Done");
}
}
}
return false;
}
}
Теперь я хочу проверить, что все пути были стерты.