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.
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| 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); }}akmwww.cdacians.com |
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