멀티 터치가 작동하지 않습니다.

Question

저는 내 자신 만의 사용자 정의보기를 만들고 캔버스를 사용하여 그려 왔습니다. 그 후 선형 레이아웃에 맞춤보기를 추가합니다. 선형 레이아웃을 위해 멀티 터치를 적용 할 수 없습니다. 선형 레이아웃에 멀티 터치를 적용 할 수 있습니까? 그렇다면 샘플 스 니펫을 공유해주십시오.

package com.hcl.MobileIdeaNapkin; 
import android.content.Context; 
import android.graphics.*; 
import android.os.Bundle; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.MotionEvent; 
import android.view.View; 

public class NapkinActivity extends GraphicsActivity implements ColorPickerDialog.OnColorChangedListener {  


    private int item_id; 
    public Canvas canvas; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(new MyView(this)); 

     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(3);  
    } 

    private Paint mPaint; 

    public void colorChanged(int color) { 
     mPaint.setColor(color); 
    } 

    public class MyView extends View { 

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

     public MyView(Context c) { 
      super(c); 

      mBitmap = Bitmap.createBitmap(320, 480, Bitmap.Config.ARGB_8888); 
      mCanvas = new Canvas(mBitmap); 
      mPath = new Path(); 
      mBitmapPaint = new Paint(Paint.DITHER_FLAG); 
     } 

     @Override 
     protected void onSizeChanged(int w, int h, int oldw, int oldh) { 
      super.onSizeChanged(w, h, oldw, oldh); 
     } 

     @Override 
     protected void onDraw(Canvas canvas) { 
      canvas.drawColor(0xFFAAAAAA); 

      canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint); 

      if(item_id==3){ 
       canvas.drawText(AppModel.contents, 100, 100, mPaint); 
      } 
      else{ 
       canvas.drawPath(mPath, mPaint); 
      } 

     } 

     private float mX, mY; 
     private static final float TOUCH_TOLERANCE = 4; 

     private void touch_start(float x, float y) { 
      mPath.reset(); 
      mPath.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) { 
       mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2); 
       mX = x; 
       mY = y; 
      } 
     } 
     private void touch_up() { 
      mPath.lineTo(mX, mY); 
      // commit the path to our offscreen 
      mCanvas.drawPath(mPath, mPaint); 
      // kill this so we don't double draw 
      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; 
     } 
    } 

    private static final int COLOR_MENU_ID = Menu.FIRST; 
    private static final int ERASE_MENU_ID = Menu.FIRST + 1; 
    private static final int TEXT_MENU_ID=Menu.FIRST+2; 


    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     super.onCreateOptionsMenu(menu); 

     menu.add(0, COLOR_MENU_ID, 0, "Color"); 
     menu.add(0, ERASE_MENU_ID, 0, "Erase"); 
     menu.add(0,TEXT_MENU_ID,0,"Text"); 

     return true; 
    } 

    @Override 
    public boolean onPrepareOptionsMenu(Menu menu) { 
     super.onPrepareOptionsMenu(menu); 
     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     mPaint.setXfermode(null); 
     mPaint.setAlpha(0xFF); 

     switch (item.getItemId()) { 

      case COLOR_MENU_ID: 
       System.out.println(item.getItemId()); 
       new ColorPickerDialog(this, this, mPaint.getColor()).show(); 
       return true; 

      case ERASE_MENU_ID: 
       System.out.println(item.getItemId()); 
       mPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR)); 
       return true; 

      case TEXT_MENU_ID: 
       item_id=item.getItemId(); 
       System.out.println(item.getItemId()); 
       new TextDialog(this).show(); 
     } 
     return super.onOptionsItemSelected(item); 
    } 
} 

Answer 1

은 당신이 가지고있는 코드에 문제가있을 수 안 :

여기 내 코드입니다. 다음을 추가했습니다 :

<uses-feature android:name="android.hardware.touchscreen.multitouch"/> 

AndroidManifest.xml에 추가 했습니까? 또한 Android 2.0 이상을 타겟팅해야한다고 생각합니다.

몇 가지 제안 사항.

- 단