我的绘图应用程序有问题，因为蒙版过滤器使用了很多参数并将其放入数组列表中。我想每次我绘制maskfilter都会添加到arraylist然后画布从头开始绘制整个数组列表。或者onDraw是问题，请给我提出改进性能的建议。
public class PaintingActivity extends AppCompatActivity {
private PaintView paintView;
private Toolbar mTopToolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_paint);
mTopToolbar = (Toolbar) findViewById(R.id.my_toolbar);
setSupportActionBar(mTopToolbar);
paintView = (PaintView) findViewById(R.id.paintView);
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
paintView.init(metrics);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.draw_menu, menu);
return super.onCreateOptionsMenu(menu);
}
private void colorPicker() {
final Context context = PaintingActivity.this;
ColorPickerDialogBuilder
.with(context)
.setTitle("Choose color")
.initialColor(DEFAULT_COLOR)
.wheelType(ColorPickerView.WHEEL_TYPE.CIRCLE)
.density(12)
.setOnColorSelectedListener(new OnColorSelectedListener() {
@Override
public void onColorSelected(int selectedColor) {
Toast.makeText(context, "onColorSelected: 0x" + Integer.toHexString(selectedColor), Toast.LENGTH_SHORT).show();
}
})
.setPositiveButton("ok", new ColorPickerClickListener() {
@Override
public void onClick(DialogInterface dialog, int selectedColor, Integer[] allColors) {
//changeBackgroundColor(selectedColor);
}
})
.setNegativeButton("cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
}
})
.build()
.show();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()) {
case R.id.normal:
paintView.normal();
return true;
case R.id.emboss:
paintView.emboss();
return true;
case R.id.blur:
paintView.blur();
return true;
case R.id.color_picker:
colorPicker();
return true;
case R.id.clear:
paintView.clear();
return true;
}
return super.onOptionsItemSelected(item);
}
}
然后是我的PaintView
public class PaintView extends View {
public static int BRUSH_SIZE = 20;
public static final int DEFAULT_COLOR = Color.RED;
public static final int DEFAULT_BG_COLOR = Color.WHITE;
private static final float TOUCH_TOLERANCE = 4;
private float mX, mY;
private Path mPath;
private Paint mPaint;
private ArrayList<FingerPath> paths = new ArrayList<>();
private int currentColor;
private int backgroundColor = DEFAULT_BG_COLOR;
private int strokeWidth;
private boolean emboss;
private boolean blur;
private MaskFilter mEmboss;
private MaskFilter mBlur;
private Bitmap mBitmap;
private Canvas mCanvas;
private Paint mBitmapPaint = new Paint(Paint.DITHER_FLAG);
public PaintView(Context context) {
this(context, null);
}
public PaintView(Context context, AttributeSet attrs) {
super(context, attrs);
mPaint = new Paint();
mPaint.setAntiAlias(true);
mPaint.setDither(true);
mPaint.setColor(DEFAULT_COLOR);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeJoin(Paint.Join.ROUND);
mPaint.setStrokeCap(Paint.Cap.ROUND);
mPaint.setXfermode(null);
mPaint.setAlpha(0xff);
mEmboss = new EmbossMaskFilter(new float[] {1, 1, 1}, 0.4f, 6, 3.5f);
mBlur = new BlurMaskFilter(5, BlurMaskFilter.Blur.NORMAL);
}
public void init(DisplayMetrics metrics) {
int height = metrics.heightPixels;
int width = metrics.widthPixels;
mBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
currentColor = DEFAULT_COLOR;
strokeWidth = BRUSH_SIZE;
}
public void normal() {
emboss = false;
blur = false;
}
public void emboss() {
emboss = true;
blur = false;
}
public void blur() {
emboss = false;
blur = true;
}
public void clear() {
backgroundColor = DEFAULT_BG_COLOR;
paths.clear();
normal();
invalidate();
}
@Override
protected void onDraw(Canvas canvas) {
canvas.save();
mCanvas.drawColor(backgroundColor);
for (FingerPath fp : paths) {
mPaint.setColor(fp.color);
mPaint.setStrokeWidth(fp.strokeWidth);
mPaint.setMaskFilter(null);
if (fp.emboss)
mPaint.setMaskFilter(mEmboss);
else if (fp.blur)
mPaint.setMaskFilter(mBlur);
mCanvas.drawPath(fp.path, mPaint);
}
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
canvas.restore();
}
private void touchStart(float x, float y) {
mPath = new Path();
FingerPath fp = new FingerPath(currentColor, emboss, blur, strokeWidth, mPath);
paths.add(fp);
mPath.reset();
mPath.moveTo(x, y);
mX = x;
mY = y;
}
private void touchMove(float x, float y) {
float dx = Math.abs(x - mX);
float dy = Math.abs(y - mY);
if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
mPath.quadTo(mX, mY, (x + mX) / 2, (y + mY) / 2);
mX = x;
mY = y;
}
}
private void touchUp() {
mPath.lineTo(mX, mY);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
switch(event.getAction()) {
case MotionEvent.ACTION_DOWN :
touchStart(x, y);
invalidate();
break;
case MotionEvent.ACTION_MOVE :
touchMove(x, y);
invalidate();
break;
case MotionEvent.ACTION_UP :
touchUp();
invalidate();
break;
}
return true;
}
}
也是我的布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.lolow.asserty.asserty.paint.PaintingActivity"
android:background="@color/lightGrey">
<android.support.v7.widget.Toolbar
android:id="@+id/my_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:elevation="4dp" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.lolow.asserty.asserty.paint.PaintView
android:id="@+id/paintView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="40dp"
android:layout_marginBottom="100dp"
android:background="@drawable/paint_view_border"/>
</RelativeLayout>
</RelativeLayout>
这也是我的路径类：
public class FingerPath {
public int color;
public boolean emboss;
public boolean blur;
public int strokeWidth;
public Path path;
public FingerPath(int color, boolean emboss, boolean blur, int strokeWidth, Path path) {
this.color = color;
this.emboss = emboss;
this.blur = blur;
this.strokeWidth = strokeWidth;
this.path = path;
}
}