我得到的错误是
android.view.InflateException: Binary XML file line #16: Error inflating class DrawView
.我正在 DrawView 类中创建自定义 View 。在 Oncreate 方法中调用 setContentView(R.layout.newimage_activity); 时会显示上述错误。
XML 布局是:
<com.capricorn.RayMenu
android:id="@+id/ray_menu"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="5dp"
android:paddingRight="5dp" />
<com.element45.android.camera.activities.DrawView
android:id="@+id/CustomView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/white"
tools:context="com.element45.android.camera.activities.newImage_Activity"
/>
而DrawView类的代码是:
public class DrawView extends View {
private Bitmap mBitmap;
private Canvas mCanvas;
private Path mPath;
private Paint mBitmapPaint;
private Paint mPaint;
private RectF rectF ;
private Region Region1;
private Region Region2;
private List<Point> mPoints;
private List<Line> mLines;
private boolean bModify_line;
private float mX, mY;
private float mOriginal_X, mOriginal_Y;
private Line mLine ;
private static final float TOUCH_TOLERANCE = 50;
public DrawView(Context c)
{
super(c);
rectF = new RectF();
mPath = new Path();
mPath.computeBounds(rectF, true);
mPaint = new Paint();
mPaint.setColor(Color.WHITE);
mPaint.setAntiAlias(true);
mPaint.setXfermode(null);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeWidth(5);
mBitmapPaint = new Paint(Paint.DITHER_FLAG);
mPoints = new ArrayList<Point>();
mLines = new ArrayList<Line>();
bModify_line = false;
}
int width,height;
@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
width = w ; height =h;
}
@Override
protected void onDraw(Canvas canvas)
{
mBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
mCanvas = new Canvas(mBitmap);
canvas.drawColor(0xFFAAAAAA);//original color 0xFFAAAAAA
canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
for(int i = 0 ; i < mLines.size();i++)
{
Line line = mLines.get(i);
mCanvas.drawLine(line.getStartPoint().x, line.getStartPoint().y, line.getEndPoint().x, line.getEndPoint().y, mPaint);
}
}
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)
{
mX = x;
mY = y;
}
}
private void touch_start(float x, float y)
{
int iLineNumber = checkPointinLines(x, y);
if(iLineNumber >= 0 )
{
bModify_line = true;
mPath.moveTo(x, y);
mX = x;
mY = y;
}
else
{
mLine = new Line();
mLine.setStartPoint(new Point((int)x, (int)y));
mPath.moveTo(x, y);
mX = x;
mY = y;
}
mOriginal_X = mX;
mOriginal_Y = mY;
}
private void touch_up()
{
if(bModify_line)
{
int iLineNumber = checkPointinLines(mOriginal_X, mOriginal_Y);
if(iLineNumber > -1)
{
Line line = mLines.get(iLineNumber);
int iPoint = checkPointOnLine(mX,mY,line);
if(iPoint >= 0)
{
if(iPoint == 0)
{
mPath.moveTo(line.getEndPoint().x, line.getEndPoint().y);
line.setStartPoint(new Point((int)mX, (int)mY));
}
else if(iPoint == 1)
{
mPath.moveTo(line.getStartPoint().x, line.getStartPoint().y);
line.setEndPoint(new Point((int)mX, (int)mY));
}
mLines.set(iLineNumber, line);
System.out.println("After setline size of lineArray::"+mLines.size());
bModify_line = false;
}
}
}
else
{
mPath.lineTo(mX, mY);
mLine.setEndPoint(new Point((int)mX, (int)mY));
mLines.add(mLine);
mPath.reset();
}
}
@Override
public boolean onTouchEvent(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;
}
/**
* Checks if user touch point with some tolerance
*/
private int checkPointOnLine(float x, float y,Line line)
{
int iPoint = -1;
Point point = line.getStartPoint();
if(x > (point.x - TOUCH_TOLERANCE) && x < (point.x + TOUCH_TOLERANCE) && y > (point.y - TOUCH_TOLERANCE) && y < (point.y + TOUCH_TOLERANCE) )
iPoint = 0;
point = line.getEndPoint();
if (x > (point.x - TOUCH_TOLERANCE) && x < (point.x + TOUCH_TOLERANCE) && (y > (point.y - TOUCH_TOLERANCE) && y < (point.y + TOUCH_TOLERANCE) ))
iPoint = 1 ;
return iPoint;
}
private int checkPointinLines(float x, float y)
{
int iLine = -1;
for(int i=0 ;i < mLines.size();i++)
{
Line line = mLines.get(i);
if(x > (line.getStartPoint().x - TOUCH_TOLERANCE)
&& x < (line.getStartPoint().x + TOUCH_TOLERANCE)
&& y > (line.getStartPoint().y - TOUCH_TOLERANCE)
&& y < (line.getStartPoint().y + TOUCH_TOLERANCE)
||
x > (line.getEndPoint().x - TOUCH_TOLERANCE)
&& x < (line.getEndPoint().x + TOUCH_TOLERANCE)
&& y > (line.getEndPoint().y - TOUCH_TOLERANCE)
&& y < (line.getEndPoint().y + TOUCH_TOLERANCE))
iLine = i;
}
return iLine;
}
public void movePoint(int position)
{
switch(position)
{
case 0:
//up
movePointUp();
break;
case 1:
//Right
movePointRight();
break;
case 2:
//Down
movePointDown();
break;
case 3:
//Left
movePointLeft();
break;
}
}
private void movePointUp()
{
if(bModify_line)
{
int iLineNumber = checkPointinLines(mOriginal_X, mOriginal_Y);
if(iLineNumber > -1)
{
Line line = mLines.get(iLineNumber);
int iPoint = checkPointOnLine(mX,mY,line);
if(iPoint >= 0)
{
int modifyPointX,modifyPointY;
if(iPoint == 0)
{
modifyPointX = line.getStartPoint().x ;
modifyPointY = line.getStartPoint().y - 2;
mPath.moveTo(line.getEndPoint().x, line.getEndPoint().y);
line.setStartPoint(new Point(modifyPointX, modifyPointY));
}
else if(iPoint == 1)
{
modifyPointX = line.getEndPoint().x;
modifyPointY = line.getEndPoint().y -2;
mPath.moveTo(line.getStartPoint().x, line.getStartPoint().y);
line.setEndPoint(new Point(modifyPointX, modifyPointY));
}
mLines.set(iLineNumber, line);
bModify_line = false;
}
}
}
else
{
Toast.makeText(getContext(), "Please select point", Toast.LENGTH_SHORT).show();
}
}
private void movePointRight()
{
if(bModify_line)
{
int iLineNumber = checkPointinLines(mOriginal_X, mOriginal_Y);
if(iLineNumber > -1)
{
Line line = mLines.get(iLineNumber);
int iPoint = checkPointOnLine(mX,mY,line);
if(iPoint >= 0)
{
int modifyPointX,modifyPointY;
if(iPoint == 0)
{
modifyPointX = line.getStartPoint().x + 2;
modifyPointY = line.getStartPoint().y ;
mPath.moveTo(line.getEndPoint().x, line.getEndPoint().y);
line.setStartPoint(new Point(modifyPointX, modifyPointY));
}
else if(iPoint == 1)
{
modifyPointX = line.getEndPoint().x + 2;
modifyPointY = line.getEndPoint().y ;
mPath.moveTo(line.getStartPoint().x, line.getStartPoint().y);
line.setEndPoint(new Point(modifyPointX, modifyPointY));
}
mLines.set(iLineNumber, line);
bModify_line = false;
}
}
}
else
{
Toast.makeText(getContext(), "Please select point", Toast.LENGTH_SHORT).show();
}
}
private void movePointLeft()
{
if(bModify_line)
{
int iLineNumber = checkPointinLines(mOriginal_X, mOriginal_Y);
if(iLineNumber > -1)
{
Line line = mLines.get(iLineNumber);
int iPoint = checkPointOnLine(mX,mY,line);
if(iPoint >= 0)
{
int modifyPointX,modifyPointY;
if(iPoint == 0)
{
modifyPointX = line.getStartPoint().x - 2 ;
modifyPointY = line.getStartPoint().y ;
mPath.moveTo(line.getEndPoint().x, line.getEndPoint().y);
line.setStartPoint(new Point(modifyPointX, modifyPointY));
}
else if(iPoint == 1)
{
modifyPointX = line.getEndPoint().x - 2;
modifyPointY = line.getEndPoint().y ;
mPath.moveTo(line.getStartPoint().x, line.getStartPoint().y);
line.setEndPoint(new Point(modifyPointX, modifyPointY));
}
mLines.set(iLineNumber, line);
bModify_line = false;
}
}
}
else
{
Toast.makeText(getContext(), "Please select point", Toast.LENGTH_SHORT).show();
}
}
private void movePointDown()
{
if(bModify_line)
{
int iLineNumber = checkPointinLines(mOriginal_X, mOriginal_Y);
if(iLineNumber > -1)
{
Line line = mLines.get(iLineNumber);
int iPoint = checkPointOnLine(mX,mY,line);
if(iPoint >= 0)
{
int modifyPointX,modifyPointY;
if(iPoint == 0)
{
modifyPointX = line.getStartPoint().x ;
modifyPointY = line.getStartPoint().y + 2;
mPath.moveTo(line.getEndPoint().x, line.getEndPoint().y);
line.setStartPoint(new Point(modifyPointX, modifyPointY));
}
else if(iPoint == 1)
{
modifyPointX = line.getEndPoint().x;
modifyPointY = line.getEndPoint().y + 2;
mPath.moveTo(line.getStartPoint().x, line.getStartPoint().y);
line.setEndPoint(new Point(modifyPointX, modifyPointY));
}
mLines.set(iLineNumber, line);
bModify_line = false;
}
}
}
else
{
Toast.makeText(getContext(), "Please select point", Toast.LENGTH_SHORT).show();
}
}
}
最佳答案
对于 xml 膨胀，您需要重写以 Context 和 AttributeSet 作为参数的构造函数。来自文档
Constructor that is called when inflating a view from XML.
添加
public DrawView(Context c, AttributeSet attrs) {
super(c, attrs);
}
到您的自定义 View 。您可以在执行初始化的两个构造函数之间共享一个通用的 init() 方法(以避免代码重复)
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