============问题描述============
自定义view public class PasterView extends View { private final static int MODE_NONE = 0; private final static int MODE_DRAG = 1; private final static int MODE_ZOOM = 2; private int mode = MODE_NONE; private Paint paint; private Matrix matrix; private Bitmap bitmap; private float oldX; private float oldY; private float firstX; private float firstY; private float oldDistance; private PointF midPoint; private float oldAngle; private Context context; private AlertDialog dialog; public PasterView(Context context) { super(context); this.context = context; paint = new Paint(); paint.setAntiAlias(true); bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.menu_camera); } public PasterView(Context context, AttributeSet attrs) { super(context, attrs); this.context = context; paint = new Paint(); paint.setAntiAlias(true); bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.menu_camera); } public PasterView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); this.context = context; paint = new Paint(); paint.setAntiAlias(true); bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.menu_camera); } @Override protected void onDraw(Canvas canvas) { if(bitmap != null){ if(matrix == null){ matrix = new Matrix(); matrix.postTranslate((getWidth() - bitmap.getWidth())/2, (getHeight() - bitmap.getHeight())/2); midPoint = new PointF(getWidth()/2, getHeight()/2); } canvas.drawBitmap(bitmap, matrix, paint); } super.onDraw(canvas); } @Override public boolean onTouchEvent(MotionEvent event) { switch(event.getAction() & MotionEvent.ACTION_MASK){ case MotionEvent.ACTION_DOWN: mode = MODE_DRAG; oldX = event.getX(); oldY = event.getY(); firstX = event.getX(); firstY = event.getY(); break; case MotionEvent.ACTION_POINTER_DOWN: mode = MODE_ZOOM; oldDistance = getDistance(event); // midPoint = getMidPoint(event); oldAngle = getAngle(event); break; case MotionEvent.ACTION_MOVE: if(mode == MODE_DRAG){ float x = event.getX(); float y = event.getY(); matrix.postTranslate(x - oldX, y - oldY); midPoint.x += (x - oldX); midPoint.y += (y - oldY); invalidate(); oldX = x; oldY = y; } else if(mode == MODE_ZOOM){ float fDistance = getDistance(event); float scale = fDistance/oldDistance; matrix.postScale(scale, scale, midPoint.x, midPoint.y); float angle = getAngle(event); matrix.postRotate((float) ((oldAngle - angle)*180/3.1415926), midPoint.x, midPoint.y); invalidate(); oldDistance = fDistance; oldAngle = angle; } break; case MotionEvent.ACTION_UP: if(mode == MODE_DRAG){ if(Math.abs(firstX - event.getX()) < 0.1 && Math.abs(firstY - event.getY()) < 0.1){ if(dialog == null){ AlertDialog.Builder builder = new AlertDialog.Builder(context); builder.setMessage("是否删除贴纸？"); builder.setNegativeButton(getResources().getString(R.string.cancel), new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.cancel(); } }); builder.setPositiveButton(getResources().getString(R.string.ok), new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); reset(); setVisibility(View.GONE); } }); dialog = builder.create(); } dialog.show(); } } mode = MODE_NONE; break; case MotionEvent.ACTION_POINTER_UP: mode = MODE_NONE; break; } return super.onTouchEvent(event); } public Matrix getMatrix() { return matrix; } public void setMatrix(Matrix matrix) { this.matrix = matrix; } public Bitmap getBitmap() { return bitmap; } public void setBitmap(Bitmap bitmap) { this.bitmap = bitmap; } private float getDistance(MotionEvent event){ return (float) Math.sqrt(Math.pow(event.getX(0) - event.getX(1), 2) + Math.pow(event.getY(0) - event.getY(1), 2)); } private PointF getMidPoint(MotionEvent event){ return new PointF((event.getX(0) + event.getX(1))/2, (event.getY(0) + event.getY(1))/2); } private float getAngle(MotionEvent event){ return (float) Math.atan2(event.getY(1) - event.getY(0),event.getX(0) - event.getX(1)); } public void reset(){ matrix = null; mode = MODE_NONE; } public void release(){ if(bitmap != null && !bitmap.isRecycled()){ bitmap.recycle(); bitmap = null; } } 布局 <?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <RelativeLayout android:id="@+id/rlTop" android:layout_width="match_parent" android:layout_height="44dp" android:background="@color/xx_translucence_camera" > <ImageView android:id="@+id/ivCancel" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/xx_cancel_shot" android:padding="10dp" android:layout_marginLeft="10dp" android:layout_centerVertical="true" /> <ImageView android:id="@+id/ivAddPaster" android:layout_width="wrap_content" android:layout_height="match_parent" android:src="@drawable/xxx_add_paster" android:layout_marginRight="20dp" android:layout_centerVertical="true" android:layout_alignParentRight="true" android:scaleType="center" /> </RelativeLayout> <ImageView android:id="@+id/ivPhoto" android:layout_below="@id/rlTop" android:layout_width="match_parent" android:layout_height="wrap_content" android:scaleType="fitXY" /> <com.xx.xxx.xxxxx.PasterView android:id="@+id/pasterView" android:layout_below="@id/rlTop" android:layout_width="match_parent" android:layout_height="wrap_content" android:clickable="true" android:background="#00000000" android:visibility="gone"/> <RelativeLayout android:id="@+id/rlMid" android:layout_below="@id/ivPhoto" android:layout_above="@+id/rlBottom" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/xx_translucence_camera" > <HorizontalScrollView android:layout_width="match_parent" android:layout_height="wrap_content" android:scrollbars="none" android:layout_alignParentBottom="true" > <LinearLayout android:id="@+id/llLens" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="horizontal" android:focusable="true" android:focusableInTouchMode="true" ></LinearLayout> </HorizontalScrollView> </RelativeLayout> <RelativeLayout android:id="@+id/rlBottom" android:layout_width="match_parent" android:layout_height="50dp" android:background="@color/xxx_black2" android:layout_alignParentBottom="true" > <TextView android:id="@+id/tvShotAgain" android:layout_width="wrap_content" android:layout_height="match_parent" android:paddingLeft="10dp" android:paddingRight="10dp" android:layout_marginLeft="10dp" android:text="@string/shot_again" android:gravity="center" android:textSize="@dimen/button_textsize" android:textColor="@color/xxxx_album_btn_text_color" /> <ImageView android:id="@+id/ivOk" android:layout_centerInParent="true" android:layout_width="100dp" android:layout_height="40dp" android:background="@drawable/xxx_btn_bg" android:src="@drawable/done" android:scaleType="center" /> </RelativeLayout> </RelativeLayout>============解决方案1============
public Matrix getMatrix() => public Matrix mgetMatrix()