Detect Touch Event, test on Custom View; part II.

Following the former post "Detect Touch Event, test on Custom View". In order to trace the trigged MotionEvent in onTouchEvent(), it's modified to have a TextView to display the event.

package com.TestSingleTouch;

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.TextView;

public class TestSingleTouch extends Activity {
 
 public class TouchView extends View {
  
  private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
  private float x, y;
  boolean touching = false;

  public TouchView(Context context) {
   super(context);
   // TODO Auto-generated constructor stub
  }

  @Override
  protected void onDraw(Canvas canvas) {
   // TODO Auto-generated method stub
   if(touching){
    paint.setStyle(Paint.Style.STROKE);
    paint.setStrokeWidth(1);
    paint.setColor(Color.WHITE);
    canvas.drawCircle(x, y, 50f, paint);
   }
  }

  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
   // TODO Auto-generated method stub
   setMeasuredDimension(MeasureSpec.getSize(widthMeasureSpec),
         MeasureSpec.getSize(heightMeasureSpec));
  }

  @Override
  public boolean onTouchEvent(MotionEvent event) {
   // TODO Auto-generated method stub
   
   String act;

   int action = event.getAction();
   switch(action){
   case MotionEvent.ACTION_MOVE:
    act = "ACTION_MOVE\n";
    x = event.getX();
    y = event.getY();
    touching = true;
    break;
   case MotionEvent.ACTION_DOWN:
    act = "ACTION_DOWN\n";
    x = event.getX();
    y = event.getY();
    touching = true;
    break;
   case MotionEvent.ACTION_UP:
    act = "ACTION_UP\n";
    touching = false;
    break;
   default:
    act = "XXX\n";
    touching = false;
   }
   
   act += event.toString();
   textView.setText(act);
   
   invalidate();
   return true;
  }

 }

 TextView textView;

 /** Called when the activity is first created. */
 @Override
 public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);
     //setContentView(new TouchView(this));
  
     textView = new TextView(this);
     textView.setText("Waiting");
     TouchView touchView = new TouchView(this);
     LinearLayout mainScreen = new LinearLayout(this);
     mainScreen.setOrientation(LinearLayout.VERTICAL);
     mainScreen.addView(textView);
     mainScreen.addView(touchView);
     setContentView(mainScreen);

 }

}

next:
- Detect Touch Event part III - get touch pressure and size

Related Post:
- Detect Touch Event, test on Custom View
- Detect Touch Event
- Detect Multi-Touch Event
- Detect Multi-Touch Event, test on Custom View