誰かがビットマップとキャンバスをクリアする方法を知っていますか？何かが間違っているか、コードが不完全だと思います。たとえば、public void forceRedraw（）のFirstActivity.javaで、invalidate（）のメソッドを作成するためのメッセージを受け取ります。別のクラスが必要な場合は、教えてください。どこが私の間違いなのか本当にわかりません。私は次のコードを使用しています。少し大きいですが、理解したいと思っています。
これは私のFirstActivity.javaです
public class FirstActivity extends Activity implements ColorPickerDialog.OnColorChangedListener {
Paint mPaint;
private Paint paint = new Paint();
private Path path = new Path();
CanvasView myView;
static LinearLayout ll;
ImageView imageViewLine;
ImageView imageViewRectangle;
private ImageView imageViewErase;
private ImageView imageViewFreehand;
private ImageView imageViewUndo;
private ImageView imageViewRedo;
private final int CONTEXT_MENU_LINES_ID = 1;
private final int CONTEXT_MENU_SHAPES_ID = 2;
private final int CONTEXT_MENU_COLOR_ID = 3;
private IconContextMenu iconContextMenuLine = null;
private IconContextMenu iconContextMenuShapes = null;
private IconContextMenu iconContextMenuColors = null;
private final int MENU_ITEM_1_ACTION = 1;
private final int MENU_ITEM_2_ACTION = 2;
private final int MENU_ITEM_3_ACTION = 3;
private final int MENU_ITEM_4_ACTION = 4;
private final int MENU_ITEM_5_ACTION = 5;
private final int MENU_ITEM_6_ACTION = 6;
private final int MENU_ITEM_7_ACTION = 7;
private final int MENU_ITEM_8_ACTION = 8;
private ImageView imageViewText;
private ImageView imageViewColor;
private File folderAppointment;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.first_activity);
initContextMenus();
myView = (CanvasView)this.findViewById(R.id.canvasView);
ll = (LinearLayout) this.findViewById(R.id.linearLayout2);
ll.setVisibility(LinearLayout.GONE);
imageViewLine = (ImageView)this.findViewById(R.id.imageViewLine);
imageViewLine.setOnClickListener(new OnClickListener() {
@SuppressWarnings("deprecation")
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "Line tool clicked", Toast.LENGTH_SHORT).show();
myView.setMode(1); //draw line
myView.setOnTouchListener(myView.drawLineListener);
showDialog(CONTEXT_MENU_LINES_ID,null);
}
});
imageViewRectangle = (ImageView)this.findViewById(R.id.imageViewSquare);
imageViewRectangle.setOnTouchListener(new OnTouchListener() {
@SuppressWarnings("deprecation")
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_DOWN)
{
Toast.makeText(getApplicationContext(), "Rectangle tool clicked", Toast.LENGTH_SHORT).show();
myView.setMode(5); //draw rectangle
showDialog(CONTEXT_MENU_SHAPES_ID,null);
return true;
}
return false;
}
});
imageViewErase = (ImageView)this.findViewById(R.id.imageViewEraser);
imageViewErase.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "Eraser tool clicked", Toast.LENGTH_SHORT).show();
myView.setMode(6); //eraser
}
});
imageViewFreehand = (ImageView)this.findViewById(R.id.imageViewSquiggle);
imageViewFreehand.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "Squiggle tool clicked", Toast.LENGTH_SHORT).show();
myView.setMode(7);//free hand draw
}
});
imageViewUndo = (ImageView)this.findViewById(R.id.imageViewUndo);
imageViewUndo.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "Undo tool clicked", Toast.LENGTH_SHORT).show();
myView.setMode(9);//undo
}
});
imageViewRedo = (ImageView)this.findViewById(R.id.imageViewRedo);
imageViewRedo.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "Redo tool clicked", Toast.LENGTH_SHORT).show();
myView.setMode(10);//redo
}
});
imageViewText = (ImageView)this.findViewById(R.id.imageViewText);
imageViewText.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "Text tool clicked", Toast.LENGTH_SHORT).show();
myView.setMode(8);//text input
}
});
imageViewColor = (ImageView)this.findViewById(R.id.imageViewColor);
imageViewColor.setOnClickListener(new OnClickListener() {
@SuppressWarnings("deprecation")
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "Select color", Toast.LENGTH_SHORT).show();
//myView.setMode(5); //draw rectangle
showDialog(CONTEXT_MENU_COLOR_ID,null);
}
});
}
@SuppressWarnings("deprecation") // to be optimized using switch instead of nested if-s
protected Dialog onCreateDialog(int id) {
if (id == CONTEXT_MENU_LINES_ID) {
return iconContextMenuLine.createMenu("Lines");
}
else if(id == CONTEXT_MENU_SHAPES_ID){
return iconContextMenuShapes.createMenu("Shapes");
}
else if(id == CONTEXT_MENU_COLOR_ID){
return iconContextMenuColors.createMenu("Choose color");
}
return super.onCreateDialog(id);
}
public void initContextMenus(){
Resources res = getResources();
//init icon context menu
iconContextMenuLine = new IconContextMenu(this, CONTEXT_MENU_LINES_ID);
iconContextMenuLine.addItem(res, "", R.drawable.line, MENU_ITEM_2_ACTION);
iconContextMenuLine.addItem(res, "", R.drawable.linie_taiata, MENU_ITEM_4_ACTION);
iconContextMenuLine.setOnClickListener(new IconContextMenu.IconContextMenuOnClickListener() {
public void onClick(int menuId) {
switch(menuId) {
case MENU_ITEM_2_ACTION:
Toast.makeText(getApplicationContext(), "You've clicked normal line", Toast.LENGTH_SHORT).show();
myView.setNormalLine();
myView.setMode(1); //draw line
break;
case MENU_ITEM_4_ACTION:
Toast.makeText(getApplicationContext(), "You've clicked dashed line", Toast.LENGTH_SHORT).show();
myView.setDashLine();
myView.setMode(2);//draw dashed line
break;
}
}
});
iconContextMenuShapes = new IconContextMenu(this, CONTEXT_MENU_SHAPES_ID);
iconContextMenuShapes.addItem(res, "", R.drawable.cerc,MENU_ITEM_1_ACTION);
iconContextMenuShapes.addItem(res, "",R.drawable.square, MENU_ITEM_2_ACTION);
iconContextMenuShapes.setOnClickListener(new IconContextMenu.IconContextMenuOnClickListener() {
public void onClick(int menuId) {
switch(menuId) {
case MENU_ITEM_1_ACTION:
Toast.makeText(getApplicationContext(), "You've clicked circle", Toast.LENGTH_SHORT).show();
myView.setMode(4); //draw circle
break;
case MENU_ITEM_2_ACTION:
Toast.makeText(getApplicationContext(), "You've clicked rectangle", Toast.LENGTH_SHORT).show();
myView.setMode(5); //draw rectangle
break;
}
}
});
iconContextMenuColors = new IconContextMenu(this, CONTEXT_MENU_SHAPES_ID);
iconContextMenuColors.addItem(res, "", R.drawable.red,MENU_ITEM_1_ACTION);
iconContextMenuColors.addItem(res, "",R.drawable.green, MENU_ITEM_2_ACTION);
iconContextMenuColors.addItem(res, "",R.drawable.blue, MENU_ITEM_3_ACTION);
iconContextMenuColors.addItem(res, "", R.drawable.magenta,MENU_ITEM_4_ACTION);
iconContextMenuColors.addItem(res, "",R.drawable.yellow, MENU_ITEM_5_ACTION);
iconContextMenuColors.addItem(res, "",R.drawable.white, MENU_ITEM_6_ACTION);
iconContextMenuColors.addItem(res, "", R.drawable.black,MENU_ITEM_7_ACTION);
iconContextMenuColors.addItem(res, "", R.drawable.black,MENU_ITEM_8_ACTION);
iconContextMenuColors.setOnClickListener(new IconContextMenu.IconContextMenuOnClickListener() {
public void onClick(int menuId) {
switch(menuId) {
case MENU_ITEM_1_ACTION:
Toast.makeText(getApplicationContext(), "Red", Toast.LENGTH_SHORT).show();
myView.changeColor(Color.RED);
break;
case MENU_ITEM_2_ACTION:
Toast.makeText(getApplicationContext(), "Green", Toast.LENGTH_SHORT).show();
myView.changeColor(Color.GREEN);
break;
case MENU_ITEM_3_ACTION:
Toast.makeText(getApplicationContext(), "Blue", Toast.LENGTH_SHORT).show();
myView.changeColor(Color.BLUE);
break;
case MENU_ITEM_4_ACTION:
Toast.makeText(getApplicationContext(), "Magenta", Toast.LENGTH_SHORT).show();
myView.changeColor(Color.MAGENTA);
break;
case MENU_ITEM_5_ACTION:
Toast.makeText(getApplicationContext(), "Yellow", Toast.LENGTH_SHORT).show();
myView.changeColor(Color.YELLOW);
break;
case MENU_ITEM_6_ACTION:
Toast.makeText(getApplicationContext(), "White", Toast.LENGTH_SHORT).show();
myView.changeColor(Color.WHITE);
break;
case MENU_ITEM_7_ACTION:
Toast.makeText(getApplicationContext(), "Black", Toast.LENGTH_SHORT).show();
myView.changeColor(Color.BLACK);
break;
case MENU_ITEM_8_ACTION:
Toast.makeText(getApplicationContext(), "Blue", Toast.LENGTH_SHORT).show();
myView.changeColor(Color.BLUE);
break;
}
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.first_activity, menu);
return true;
}
public boolean onOptionsItemSelected(MenuItem item){
switch (item.getItemId()) {
case R.id.tools:
ll.setVisibility(LinearLayout.VISIBLE);
return true;
case R.id.import_pics:
getPhotos();
return true;
case R.id.save:
toJPEGFile();
return true;
case R.id.trash:
clearPoints();
return true;
}
return false;
}
public void clearPoints () {
forceRedraw();
}
public void forceRedraw() {
invalidate();
}
private void toJPEGFile() {
// TODO Auto-generated method stub
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/saved_images");
myDir.mkdirs();
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
String fname = "Image-"+ n +".jpg";
File file = new File (myDir, fname);
if (file.exists ()) file.delete ();
try {
FileOutputStream out = new FileOutputStream(file);
Bitmap finalBitmap = CanvasView.bitmap;
finalBitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public void getPhotos(){
Intent photoPickerIntent = new Intent(Intent.ACTION_GET_CONTENT);
photoPickerIntent.setType("image/*");
startActivityForResult(photoPickerIntent, 1);
}
protected void onActivityResult(int requestCode, int resultCode, Intent data)
{
super.onActivityResult(requestCode, resultCode, data);
if (resultCode == RESULT_OK)
{
Uri chosenImageUri = data.getData();
Toast.makeText(getApplicationContext(), "Photo background added!", Toast.LENGTH_SHORT).show();
Bitmap mBitmap = null;
try {
mBitmap = Media.getBitmap(this.getContentResolver(), chosenImageUri);
if(mBitmap.isMutable())
Toast.makeText(getApplicationContext(), "is mutable", Toast.LENGTH_SHORT).show();
//cView = new MyCustomView(getApplicationContext(), null);
myView.setImage(mBitmap);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public void colorChanged(int color) {
mPaint.setColor(color);
}
}
そしてここにCanvasView.javaがあります
public class CanvasView extends View{
private ArrayList<Path> undonePaths = new ArrayList<Path>();
private ArrayList<Path> paths = new ArrayList<Path>();
private static final float STROKE_WIDTH = 5f;
private static final float HALF_STROKE_WIDTH = STROKE_WIDTH/2;
private float mX, mY;
private static final float TOUCH_TOLERANCE = 4;
Paint erasePaint = new Paint();
Paint paint = new Paint();
Path path = new Path();
float lastTouchX,lastTouchY;
AlertDialog.Builder alert;
RectF ovalRectangle = new RectF();
RectF dirtyRect = new RectF();
MyRectangle myRectangle;
MyOval myOval;
MyCircle myCircle;
MyFreehand myFreehand;
MyLine myLine;
MyEraser myEraser;
List<MyEraser> eraserList = new ArrayList<MyEraser>();
List<MyLine> lineList = new ArrayList<MyLine>();
List<MyFreehand> freehandList = new ArrayList<MyFreehand>();
List<MyCircle> circleList = new ArrayList<MyCircle>();
List<MyOval> ovalList = new ArrayList<MyOval>();
List<MyRectangle> rectangleList = new ArrayList<MyRectangle>();
public boolean dashedLine = false;
public DashPathEffect dashEffect = new DashPathEffect(new float[]{20,30}, 0);
private Paint mBitmapPaint;
private Bitmap mBitmap;
public String textValue;
public CanvasView(Context context, AttributeSet attrs) {
super(context, attrs);
setBackgroundColor(Color.WHITE);
if (android.os.Build.VERSION.SDK_INT >= 11)
{
turnOffHardwareAcc();
}
erasePaint.setColor(Color.TRANSPARENT);
//erasePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
erasePaint.setAntiAlias(true);
erasePaint.setStyle(Paint.Style.STROKE);
erasePaint.setStrokeJoin(Paint.Join.ROUND);
erasePaint.setStrokeWidth(5f);
paint.setColor(Color.BLACK);
paint.setStyle(Paint.Style.STROKE);
paint.setAntiAlias(true);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeWidth(STROKE_WIDTH);
paint.setTextSize(72);
setMode(7);//default = 7 - free hand;
mBitmap = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888);
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
/* input dialog*/
//setInputDialog();
}
EditText input;
public void setInputDialog(){
alert = new AlertDialog.Builder(getContext());
alert.setTitle("Title");
alert.setMessage("Write text");
// Set an EditText view to get user input
input = new EditText(getContext());
alert.setView(input);
alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
textValue= input.getText().toString();
Toast.makeText(getContext(), textValue, Toast.LENGTH_SHORT).show();
// Do something with value!
}
});
alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
// Canceled.
}
});
//alert.show();
}
private void touch_start(float x, float y) {
undonePaths.clear();
path.reset();
path.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) {
path.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
mX = x;
mY = y;
}
}
private void touch_up() {
path.lineTo(mX, mY);
Canvas mCanvas = null;
// commit the path to our offscreen
mCanvas.drawPath(path, paint);
// kill this so we don't double draw
paths.add(path);
path = new Path();
}
public void Undo () {
if (paths.size()>0) {
undonePaths.add(paths.remove(paths.size()-1));
invalidate();
}
else
{
}
}
public void Redo (){
if (undonePaths.size()>0) {
paths.add(undonePaths.remove(undonePaths.size()-1));
invalidate();
}
else
{
}
}
public void setDashLine(){
dashedLine = true;
paint = new Paint();
paint.setPathEffect(dashEffect);
paint.setStyle(Paint.Style.STROKE);
paint.setAntiAlias(true);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeWidth(STROKE_WIDTH);
}
public void setNormalLine(){
//paint.setColor(Color.BLACK);
dashedLine = false;
paint.setPathEffect(null);
paint.setStyle(Paint.Style.STROKE);
paint.setPathEffect(null);
paint.setAntiAlias(true);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeWidth(STROKE_WIDTH);
}
@TargetApi(11)
public void turnOffHardwareAcc() // to enable dashed lines
{
this.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
}
//public void setPaint(int color,)
@TargetApi(11)
protected void onDraw(Canvas canvas) {
paint.setPathEffect(null);
if(bitmap!=null){
canvas.drawBitmap(bitmap, 0, 0, paint);
for(MyCircle circle:circleList){// draw circles
myCanvas.drawCircle(getCircleMidPointX(circle.firstX, circle.lastX),getCircleMidPointY(circle.firstY, circle.lastY),circle.radius,myPaint);
}
}
for(MyLine line:lineList){ //draw lines
if(dashedLine)
line.paint.setPathEffect(dashEffect);
else
line.paint.setPathEffect(null);
canvas.drawLine(line.xStart, line.yStart, line.xEnd, line.yEnd, line.paint);
}
for(MyCircle circle:circleList){// draw circles
canvas.drawCircle(getCircleMidPointX(circle.firstX, circle.lastX),getCircleMidPointY(circle.firstY, circle.lastY),circle.radius,paint);
}
for(MyOval oval:ovalList){
oval.paint.setPathEffect(null);
ovalRectangle.set(oval.getX1(),oval.getY1(),oval.getX2(),oval.getY2());
canvas.drawOval(ovalRectangle, oval.paint);
}
for(MyRectangle rectangle:rectangleList){
rectangle.paint.setPathEffect(null);
canvas.drawRect(rectangle.getX1(),rectangle.getY1(),rectangle.getX2(),rectangle.getY2(),rectangle.paint);
}
for(MyEraser e:eraserList){
canvas.drawPath(e.p,erasePaint);
invalidate();
}
if(textValue!= null)
canvas.drawText(textValue, xStart, yStart, paint);
canvas.drawPath(path, paint);
//path.reset();
}
public boolean onTouch(View arg0, MotionEvent event) {
float x = event.getX();
float y = event.getY();
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;
}
final OnTouchListener drawLineListener = new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
FirstActivity.ll.setVisibility(LinearLayout.GONE);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
myLine = new MyLine();
myLine.xStart = event.getX();
myLine.yStart = event.getY();
return true;
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
myLine.xEnd = event.getX();
myLine.yEnd = event.getY();
invalidate();
lineList.add(myLine);
break;
default:
Log.d("mock it up", "Unknown touch event " + event.toString());
return false;
}
return true;
}
};
final OnTouchListener drawDashedLineListener = new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
FirstActivity.ll.setVisibility(LinearLayout.GONE);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
return true;
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
break;
default:
Log.d("mock it up", "Unknown touch event " + event.toString());
return false;
}
return true;
}
};
final OnTouchListener drawCircleListener = new OnTouchListener(){
public boolean onTouch(View v, MotionEvent event) {
FirstActivity.ll.setVisibility(LinearLayout.GONE);
float eventX = event.getX();
float eventY = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
// path.moveTo(eventX, eventY);
Toast.makeText(getContext(), "action down - circle",Toast.LENGTH_SHORT).show();
myCircle = new MyCircle();
myCircle.firstX = eventX;
myCircle.firstY = eventY;
// There is no end point yet, so don't waste cycles invalidating.
return true;
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
myCircle.lastX = eventX;
myCircle.lastY = eventY;
myCircle.radius = getRadius(myCircle.firstX,myCircle.firstY,myCircle.lastX,myCircle.lastY);
circleList.add(myCircle);
invalidate();
break;
default:
Log.d("mock it up", "Unknown touch event " + event.toString());
return false;
}
return true;
}
};
final OnTouchListener drawOvalListener = new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
FirstActivity.ll.setVisibility(LinearLayout.GONE);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
myOval = new MyOval();
myOval.setX1(event.getX());
myOval.setY1(event.getY());
// There is no end point yet, so don't waste cycles invalidating.
return true;
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
myOval.setX2(event.getX());
myOval.setY2(event.getY());
invalidate();
ovalList.add(myOval);
default:
Log.d("mock it up", "Unknown touch event " + event.toString());
return false;
}
}
};
final OnTouchListener drawRectangleListener = new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
FirstActivity.ll.setVisibility(LinearLayout.GONE);
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
myRectangle = new MyRectangle();
myRectangle.setX1(event.getX());
myRectangle.setY1(event.getY());
return true;
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
myRectangle.setX2(event.getX());
myRectangle.setY2(event.getY());
invalidate();
rectangleList.add(myRectangle);
break;
default:
Log.d("mock it up", "Unknown touch event " + event.toString());
return false;
}
return true;
}
};
final OnTouchListener eraseListener = new OnTouchListener() {
};
final OnTouchListener drawFreeHandListener = new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
FirstActivity.ll.setVisibility(LinearLayout.GONE);
float eventX = event.getX();
float eventY = event.getY();
// Include half the stroke width to avoid clipping.
invalidate(
(int) (dirtyRect.left - HALF_STROKE_WIDTH),
(int) (dirtyRect.top - HALF_STROKE_WIDTH),
(int) (dirtyRect.right + HALF_STROKE_WIDTH),
(int) (dirtyRect.bottom + HALF_STROKE_WIDTH));
lastTouchX = eventX;
lastTouchY = eventY;
return true;
}
};
float xStart,yStart;
final OnTouchListener textListener = new OnTouchListener() {
public boolean onTouch(View v, MotionEvent event) {
FirstActivity.ll.setVisibility(LinearLayout.GONE);
// Toast.makeText(getContext(), "add some text", Toast.LENGTH_SHORT).show();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
//
setInputDialog();
xStart = event.getX();
yStart = event.getY();
alert.show();
break;
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
// setInputDialog();
break;
default:
Log.d("mock it up", "Unknown touch event " + event.toString());
return false;
}
return true;
}
};
/**
* Called when replaying history to ensure the dirty region includes all
* points.
*/
private void expandDirtyRect(float historicalX, float historicalY) {
if (historicalX < dirtyRect.left) {
dirtyRect.left = historicalX;
} else if (historicalX > dirtyRect.right) {
dirtyRect.right = historicalX;
}
if (historicalY < dirtyRect.top) {
dirtyRect.top = historicalY;
} else if (historicalY > dirtyRect.bottom) {
dirtyRect.bottom = historicalY;
}
}
/**
* Resets the dirty region when the motion event occurs.
*/
private void resetDirtyRect(float eventX, float eventY) {
// The lastTouchX and lastTouchY were set when the ACTION_DOWN
// motion event occurred.
dirtyRect.left = Math.min(lastTouchX, eventX);
dirtyRect.right = Math.max(lastTouchX, eventX);
dirtyRect.top = Math.min(lastTouchY, eventY);
dirtyRect.bottom = Math.max(lastTouchY, eventY);
}
public void setMode(int mode){
switch(mode){
case 1://draw line
Toast.makeText(getContext(), "draw line", Toast.LENGTH_SHORT).show();
setOnTouchListener(drawLineListener);
break;
case 2://draw dashed line
Toast.makeText(getContext(), "dashed line", Toast.LENGTH_SHORT).show();
break;
case 3:// draw circle
setOnTouchListener(drawCircleListener);
break;
case 4: //draw oval
setOnTouchListener(drawOvalListener);
break;
case 5: //draw rectangle
setOnTouchListener(drawRectangleListener);
break;
case 6: //erase
setOnTouchListener(eraseListener);
break;
case 7: //free-hand
setOnTouchListener(drawFreeHandListener);
break;
case 8:
setOnTouchListener(textListener);
break;
}
}
static Bitmap bitmap;
private Canvas myCanvas;
public Paint myPaint;
public void setImage(Bitmap b){
Toast.makeText(getContext(), "set Bitmap",Toast.LENGTH_SHORT).show();
bitmap = b.copy(Bitmap.Config.ARGB_8888, true);
myCanvas = new Canvas(bitmap);
myPaint = new Paint();
myPaint.setColor(Color.YELLOW);
myPaint.setAntiAlias(true);
myPaint.setStrokeWidth(8);
invalidate();
}
public void changeColor(int color){
paint = new Paint(paint);
paint.setColor(color);
//myPaint.setColor(color);
}
public float getRadius(float x1,float y1,float x2,float y2){
float r = (float) (Math.sqrt((double)(Math.pow((y2-y1), 2.0)+Math.pow((x2-x1), 2.0)))/2);
return r;
}
public float getCircleMidPointX(float x1,float x2){
return (x1+x2)/2;
}
public float getCircleMidPointY(float y1,float y2){
return (y1+y2)/2;
}
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
mBitmap = Bitmap.createBitmap(w, h, Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(mBitmap);
canvas.drawColor(Color.GREEN);
super.onSizeChanged(w, h, oldw, oldh);
}
}
私の問題がどこにあるかを理解するのに役立つように、コードを添付しました。あなたが私を助けてくれることを願っています。前もって感謝します ：）