我正在编写EditText的子类,允许用户用手指在上面绘图。为此,我创建了一个名为drawing的布尔值,如果它是真的将EditText放在绘图模式而键盘没有打开,如果它是假,则允许用户打开键盘并写入保持他的绘图,他做的绘图模式。
图纸的代码基于名为FingerPaint的Google Android示例。在将此实现为EditText的意图之前,代码是在视图的子类上实现的,并且完美地工作,但问题是在布局中组合EditText和该视图会降低性能非常糟糕。
有很多代码可以执行此操作,因为可以用来实现两个不同的掩码过滤器,这些过滤器会向此代码添加一些未在此类本地使用的行。
我的问题是,当我覆盖onDraw()并且绘图为false时,文本不会显示给用户,而是显示键盘和书写行(|)。
这是我的代码:
import android.content.Context;
import android.graphics.*;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.widget.EditText;
public class DrawEditText extends EditText {
private Bitmap mBitmap;
private Canvas mCanvas;
private Path mPath;
private Paint mBitmapPaint;
private Paint mPaint;
private MaskFilter mEmboss;
private MaskFilter mBlur;
private Boolean drawing;
public DrawEditText(Context c) {
super(c);
//This initializes all the objects
mPath = new Path();
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
mPaint = new Paint();
mPaint.setColor(Color.BLACK);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeWidth(5);
mPaint.setAntiAlias(true);
mEmboss = new EmbossMaskFilter(new float[] { 1, 1, 1 },
0.4f, 6, 3.5f);
mBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL);
drawing = true;
}
public DrawEditText(Context c, AttributeSet attrs) {
super(c, attrs);
//This initializes all the objects
mPath = new Path();
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
mPaint = new Paint();
mPaint.setColor(Color.BLACK);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeWidth(5);
mPaint.setAntiAlias(true);
mEmboss = new EmbossMaskFilter(new float[] { 1, 1, 1 },
0.4f, 6, 3.5f);
mBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL);
drawing = true;
}
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
}
@Override
protected void onDraw(Canvas canvas) {
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
canvas.drawPath(mPath, mPaint);
}
private float mX, mY;
private static final float TOUCH_TOLERANCE = 4;
private void touch_start(float x, float y) {
mPath.reset();
mPath.moveTo(x, y);
mX = x;
mY = y;
}
private void touch_move(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 touch_up() {
mPath.lineTo(mX, mY);
// commit the path to our offscreen
mCanvas.drawPath(mPath, mPaint);
// kill this so we don't double draw
mPath.reset();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
float x = event.getX();
float y = event.getY();
//This conditional makes that if not it's drawing no points are saved and no points are drawed
if (drawing){
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
touch_start(x, y);
invalidate();
break;
case MotionEvent.ACTION_MOVE:
touch_move(x, y);
invalidate();
break;
case MotionEvent.ACTION_UP:
touch_up();
invalidate();
break;
}
return true;
} else {
return super.onTouchEvent(event);
}
}
public void changePaint(int stroke, int color){
mPaint.setColor(color);
mPaint.setStrokeWidth(stroke);
}
public void clear(){
mCanvas.drawColor(0x00AAAAAA);
mCanvas.drawColor( 0, PorterDuff.Mode.CLEAR );
}
public void changeBrush(int id){
//String[] ids={"emboss", "blur", "another"};
switch (id) {
case 0:
mPaint.setMaskFilter(mEmboss);
break;
case 1:
mPaint.setMaskFilter(mBlur);
break;
case 2:
mPaint.setMaskFilter(null);
break;
default:
mPaint.setMaskFilter(null);
break;
}
}
public void eraser(){
mPaint.setMaskFilter(null);
mPaint.setColor(0x00AAAAAA);
}
public void setDrawing(Boolean drawing){
this.drawing = drawing;
}
public Boolean isDrawing(){
return drawing;
}
}
答案 0 :(得分:1)
只需让EditText有机会绘制自己的内容:
@Override
protected void onDraw(Canvas canvas) {
if(drawing) {
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
canvas.drawPath(mPath, mPaint);
} else {
super.onDraw(canvas);
}
}