Android中View跟随手指移动效果

最近做了一个项目中,其中遇到这样的需求要求图片移动到手指触碰的地方。具体实现代码如下所示:

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);

}

}

以上所述是小编给大家介绍的Android中View跟随手指移动效果,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对网站的支持!

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