android中view随手指移动

在项目中，图片移动到手指触碰的地方。

package com.example.plane;

import android.app.Activity;

import android.os.Bundle;

import android.util.DisplayMetrics;

import android.view.Display;

import android.view.KeyEvent;

import android.view.Menu;

import android.view.MenuItem;

import android.view.MotionEvent;

import android.view.View;

import android.view.View.OnKeyListener;

import android.view.View.OnTouchListener;

import android.view.Window;

import android.view.WindowManager;

public class MainActivity extends Activity {
private int speed = 10;
private MyPlane plane;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
plane = new MyPlane(this);
setContentView(plane);

// plane.setBackgroundResource(R.drawable.ic_launcher);
WindowManager manager = getWindowManager();
Display display = manager.getDefaultDisplay();
DisplayMetrics metrics = new DisplayMetrics();
display.getMetrics(metrics);
plane.currentX = metrics.widthPixels / 2;
plane.currentY = metrics.heightPixels / 2;

}

@Override
public boolean onTouchEvent(MotionEvent event) {
/*float x = 0;
float y = 0;
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
x = event.getX();
y = event.getY();

break;
case MotionEvent.ACTION_MOVE:
x = event.getX();
y = event.getY();

break;
case MotionEvent.ACTION_UP:
x = event.getX();
y = event.getY();

break;

}*/
plane.currentX=event.getX();
plane.currentY=event.getY();
plane.invalidate();
return super.onTouchEvent(event);
}

}

package com.example.plane;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.graphics.Canvas;

import android.graphics.Paint;

import android.view.View;

public class MyPlane extends View {
Bitmap plane;
public float currentX;
public float currentY;

public MyPlane(Context context) {
super(context);
plane = BitmapFactory.decodeResource(context.getResources(),
R.drawable.ic_launcher);
setFocusable(true);
}

@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Paint p = new Paint();
canvas.drawBitmap(plane, currentX, currentY, p);

}

}