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实际上我正在android中进行图像编辑并使用画布......但我不知道......

  1. 如何一起使用画布和 UI ..??
  2. 如何在画布上使用按钮和其他小部件...？？
  3. 如何使多边形可编辑..这样，如果我触摸任何点，它就会突出显示，我可以调整多边形的大小。

有我的代码：

public class Crop_Image_Activity1 extends Activity implements OnClickListener
{

    static int count=0,i=0,j=0;
    ImageView img1;
    Button bt1,bt2;
    Path path=new Path();
    Paint mPaint;
    float x_current,y_current;

    float x0,y0;
    float x1,y1;
    float pointx[]=new float[20];
    float pointy[]=new float[20];
    String num;

    MyView view1; 
    ViewGroup.LayoutParams params;


@Override
protected void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_crop__image__activity1);
    img1=(ImageView)findViewById(R.id.imageView1);
    bt1=(Button)findViewById(R.id.button1);
    bt2=(Button)findViewById(R.id.button2);
    //img1.setImageResource(R.drawable.pic1);

    this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

    mPaint = new Paint();
    mPaint.setAntiAlias(true);
    mPaint.setDither(true);
    mPaint.setColor(0xFFFF0000);
    mPaint.setStyle(Paint.Style.STROKE);
    mPaint.setStrokeJoin(Paint.Join.ROUND);
    mPaint.setStrokeCap(Paint.Cap.ROUND);
    mPaint.setStrokeWidth(1);





    view1=new MyView(this);
    params =new ViewGroup.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT);
    addContentView(view1, params);

   // bt1.setOnClickListener(this);
   // bt2.setOnClickListener(this);



}
public class MyView extends View implements android.view.GestureDetector.OnGestureListener{

    private Bitmap  mBitmap;
    private Canvas  mCanvas;
    private Path    mPath;
    private Paint   mBitmapPaint;
    private GestureDetector gestureScanner;

    public MyView(Context c) 
    {
        super(c);
        mPath = new Path();
        mBitmapPaint = new Paint(Paint.DITHER_FLAG);
        gestureScanner=new GestureDetector(this);

    }

    @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);
   }

    @SuppressLint("DrawAllocation")
    @Override
    protected void onDraw(Canvas canvas) 
    {

        canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
        canvas.drawPath(mPath, mPaint);

    }





    @Override
    public boolean onTouchEvent(MotionEvent event) 
    {


        return gestureScanner.onTouchEvent(event);


    }

    public boolean onDown(MotionEvent arg0) 
    {

        x1=arg0.getX();
        y1=arg0.getY();


        if(count==-1)
        {
            mPath.reset();
            mPath.moveTo(pointx[j],pointy[j]);
        }

        else if(count==0)////    storing initial points 
        {
           mPath.moveTo(x1, y1);
           mCanvas.drawCircle(x1,y1,10, mPaint);
           x0=x1;
           y0=y1;
           pointx[i]=x1; /// storing all points in array 
           pointy[i]=y1;
        }

        else if(count>0)
        {
            mPath.moveTo(x_current,y_current);
            mCanvas.drawCircle(x_current,y_current,10, mPaint);

        }
        count++;

        invalidate();

        return true;
    }

    @Override
    public boolean onFling(MotionEvent arg0, MotionEvent arg1, float arg2,float arg3) 
    {


         x_current=arg1.getX();
         y_current=arg1.getY();



         i++;
         pointx[i]=x_current;
         pointy[i]=y_current;
         mPath.lineTo(x_current,y_current);
         mCanvas.drawPath(mPath, mPaint);
         invalidate();
        return true;
    }

    public boolean onSingleTapUp(MotionEvent e) 
    {

         mPath.moveTo(x_current,y_current);
         mPath.lineTo(x0,y0);
         mCanvas.drawPath(mPath, mPaint);
         invalidate();

         return true;
    }
    public boolean onDoubleTapUp(MotionEvent e) 
    {

        return false;

    }
    public void onLongPress(MotionEvent e)
    {

        for(j=0;j<=i;j++)
        {
            if((e.getX()>pointx[j]-20 && e.getX()<pointx[j]+20) && (e.getY()>pointy[j]-20 && e.getY()<pointy[j]+20))
            {
                mPaint.setColor(Color.BLUE);
                mCanvas.drawCircle(pointx[j],pointy[j],20, mPaint);
                count=-1;
                invalidate();
                mPaint.setColor(0xFFFF0000);
                break;

            }
        }

    }

    @Override
    public boolean onScroll(MotionEvent e1, MotionEvent e2,float distanceX, float distanceY) 
    {

        return false;
    }

    @Override
    public void onShowPress(MotionEvent e) 
    {


    }
}

public void onClick(View view)
{
    switch(view.getId())
    {
          case R.id.button1:


                break;
          case R.id.button2:

               // Intent intent1=new Intent();
               // startActivity(intent1);
                break;
    }


}

public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.activity_crop__image__activity1, menu);
    return true;
}

}
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1 回答 1

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如果您希望自定义视图和 xml 布局中的组件都出现在屏幕上，请创建一个 RelativeLayout 并将其设置为活动的视图。然后将您的自定义视图添加到该布局并使用相对布局作为父级从您的 .xml 文件中扩展视图。

像这样：

RelativeLayout relativeLayout = new RelativeLayout(this);
setContentView(relativeLayout);

layout.addView(myView);

LayoutInflater inflater = LayoutInflater.from(this);
inflater.inflate(R.layout.activity_crop__image__activity1, relativeLayout);

关于最后一个问题，在你的 onTouch 方法中尝试这样

public boolean onTouch(View v, MotionEvent event) {
    switch(event.getAction()){
    case MotionEvent.ACTION_DOWN:
    tx = event.getX();  // get coordinates when you touch the screen
    ty = event.getY();
    break;
    case MotionEvent.ACTION_MOVE:
    newX = event.getX();   // get coordinates when you move the finger
    newY = event.getY();

    for(int i = 0; i < pointx.length; i++){ // iterate over points array
        if(((tx - pointx[i])*(tx - pointx[i]) + (ty - pointy[i])*(ty - pointy[i])) < 20){
            // if you touched within 20 pixels of the polygon's vertex
            // ...
            // create Path anew replacing that vertex with coordinates newX and newY
            }
        }
        break;
    }
    return true;
}
于 2013-02-21T20:34:58.873 回答