Jun 21, 2011

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.

Test Single Touch

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

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