繪製多邊形，並使其可編輯採用了android .....

Question

其實我做的圖像編輯在Android和使用帆布...但我不知道....

1. 如何工作與畫布和用戶界面在一起.. ??
2. 如何使用按鈕和其他小部件與畫布...？
3. 如何使多邊形可編輯..所以，如果我觸摸任何點，那麼它應該突出顯示，我可以調整多邊形的大小。

有我的代碼：

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; 
} 

} 

Answer 1

如果你想從XML佈局兩個自定義視圖和組件出現在屏幕上，創建一個RelativeLayout的，並設置爲活動的看法。然後將你的cutom視圖添加到該佈局，並使用相對佈局作爲父級，從.xml文件中膨脹視圖。

像這樣：

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

layout.addView(myView); 

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

關於你onTouch方法的最後一個問題，嘗試某事像這樣

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; 
}