onTouch android

开始学习Android的编程也有几天了，这几天学了好多多西。。

 

最近想着开发一个小游戏，作为一款全触屏的手机，触屏事件是不可少的。。

为了这个，我写了一段小代码来看看触屏事件到底是怎么样运作的。。。。

 

顺便给正在学习的人作个参照

 

 

 

 

package my.android.TouchTest; import android.app.Activity; import android.os.Bundle; import android.view.MotionEvent; import android.view.GestureDetector; import android.view.Window; import android.view.WindowManager; import android.view.GestureDetector.OnGestureListener; public class TouchTest extends Activity implements OnGestureListener{ /** Called when the activity is first created. */ TouchView tv; GestureDetector gd; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.main); tv=(TouchView) findViewById(R.id.TouchView); gd=new GestureDetector(this); } @Override public boolean onTouchEvent(MotionEvent me){ switch(me.getAction()) { case MotionEvent.ACTION_UP: tv.onUp(); break; } return gd.onTouchEvent(me); } @Override public boolean onDown(MotionEvent e) { tv.keyDown(e); return false; } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) { tv.onFling(velocityX,velocityY,e1,e2); // TODO Auto-generated method stub return false; } @Override public void onLongPress(MotionEvent e) { tv.onLongPress(e); // TODO Auto-generated method stub } @Override public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) { tv.onScroll(distanceX,distanceY,e1); // TODO Auto-generated method stub return false; } @Override public void onShowPress(MotionEvent e) { // TODO Auto-generated method stub tv.onShowPress(e); } @Override public boolean onSingleTapUp(MotionEvent e) { // TODO Auto-generated method stub tv.onSingleTapUp(e); return false; } } 

 

 

package my.android.TouchTest; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; public class TouchView extends View{ private boolean bOnDown; private boolean bOnFling; private boolean bLongPress; private boolean bOnScroll; private boolean bOnShowPress; private boolean bOnSingleTapUp; private double dX1,dY1; private double dX2,dY2; private float dX,dY; public TouchView(Context context, AttributeSet attrs) { super(context, attrs); bOnDown=false; bOnFling=false; bLongPress=false; bOnScroll=false; bOnShowPress=false; bOnSingleTapUp=false; } @Override public void onDraw(Canvas canvas){ Paint paint; paint=new Paint(); paint.setColor(Color.RED); paint.setTextSize(15); if(bOnDown){ canvas.drawText("OnDown=True", 10, 30, paint); }else{ canvas.drawText("OnDown=Flase", 10, 30, paint); } if(bOnFling){ canvas.drawText("OnFling=True X="+String.valueOf((int)dX1)+" Y="+String.valueOf((int)dY1), 10, 50, paint); }else{ canvas.drawText("OnFling=False",10,50,paint); } if(bLongPress){ canvas.drawText("LongPress=True", 10, 70, paint); }else{ canvas.drawText("LongPress=False", 10, 70, paint); } if(bOnScroll){ canvas.drawText("OnScroll=True X="+String.valueOf((int)dX2)+" Y="+String.valueOf((int)dY2), 10 , 90, paint); }else{ canvas.drawText("OnScroll=False", 10 , 90, paint); } if(bOnShowPress){ canvas.drawText("OnShowPress=True", 10 , 110, paint); }else{ canvas.drawText("OnShowPress=False", 10 , 110, paint); } if(bOnSingleTapUp){ canvas.drawText("bOnSingleTapUp=True",10,130,paint); }else{ canvas.drawText("bOnSingleTapUp=False",10,130,paint); } canvas.drawText("X="+String.valueOf(dX)+" Y="+String.valueOf(dY),10,300,paint); canvas.drawCircle(dX, dY, (float)30, paint); canvas.drawLine(0, dY, 400, dY, paint); canvas.drawLine(dX, 0, dX, 500, paint); } public void keyDown(MotionEvent e){ bOnDown=true; dX=e.getRawX(); dY=e.getRawY(); this.invalidate(); } public void onFling(double X,double Y,MotionEvent e1,MotionEvent e2){ dX1=X;dY1=Y; bOnFling=true; this.invalidate(); } public void onLongPress(MotionEvent e) { // TODO Auto-generated method stub bLongPress=true; this.invalidate(); } public void onScroll(float distanceX, float distanceY,MotionEvent e) { // TODO Auto-generated method stub bOnScroll=true; dX2=distanceX; dY2=distanceY; dX-=(float)dX2;//注意方向 dY-=(float)dY2; this.invalidate(); } public void onShowPress(MotionEvent e) { // TODO Auto-generated method stub bOnShowPress=true; this.invalidate(); } public void onSingleTapUp(MotionEvent e) { // TODO Auto-generated method stub bOnSingleTapUp=true; this.invalidate(); } public void onUp(){ bOnDown=false; bOnFling=false; bLongPress=false; bOnScroll=false; bOnShowPress=false; bOnSingleTapUp=false; this.invalidate(); } }  

 

 

 

<?xml version="1.0" encoding="utf-8"?> <FrameLayout android:id="@+id/FrameLayout01" android:layout_width="fill_parent" android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android"> <my.android.TouchTest.TouchView android:id="@+id/TouchView" android:layout_width="fill_parent" android:layout_height="fill_parent" /> </FrameLayout>