本文实例讲述了Android编程实现图标拖动效果的方法。分享给大家供大家参考，具体如下：
最近优化图标拖动时的速率，稍微有一点点效果，直接把代码贴出来，有兴趣一起讨论的朋友可以给我留言。
代码如下:
DragView.java
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package com.android.dragtest;import android.content.Context;import android.util.AttributeSet;import android.util.Log;import android.view.MotionEvent;import android.view.View;import android.widget.FrameLayout;public class DragView extends FrameLayout { private static final String TAG = "DragView"; private float X; private float Y; private View mDragView; public DragView(Context context) { this(context, null); } public DragView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public DragView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); mDragView = new View(context); mDragView.setLayoutParams(new LayoutParams(60, 60)); mDragView.setBackgroundDrawable(getResources().getDrawable(R.drawable.gamecenter)); mDragView.setVisibility(View.INVISIBLE); addView(mDragView); } public boolean onInterceptTouchEvent(MotionEvent ev) { final int action = ev.getAction(); switch (action) { case MotionEvent.ACTION_DOWN: Log.d(TAG, "===============>onInterceptTouchEvent ACTION_DOWN"); break; case MotionEvent.ACTION_MOVE: Log.d(TAG, "===============>onInterceptTouchEvent ACTION_MOVE"); break; case MotionEvent.ACTION_UP: Log.d(TAG, "===============>onInterceptTouchEvent ACTION_UP"); break; } return true; } public boolean onTouchEvent(MotionEvent ev) { final int action = ev.getAction(); X = ev.getX(); Y = ev.getY(); switch (action) { case MotionEvent.ACTION_DOWN: Log.d(TAG, "onTouchEvent ACTION_DOWN"); mDragView.layout((int)X - 30, (int)Y - 30, (int)X + 30, (int)Y + 30); mDragView.setVisibility(View.VISIBLE); break; case MotionEvent.ACTION_MOVE: Log.d(TAG, "onTouchEvent ACTION_MOVE x:" + X + " Y:" + Y); mDragView.layout((int)X - 30, (int)Y - 30, (int)X + 30, (int)Y + 30); break; case MotionEvent.ACTION_UP: Log.d(TAG, "onTouchEvent ACTION_UP"); mDragView.setVisibility(View.INVISIBLE); break; } return true; }} |
DragTestActivity.java
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package com.android.dragtest;import android.app.Activity;import android.os.Bundle;public class DragTestActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); }} |
main.xml
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<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <com.android.dragtest.DragView android:layout_width="match_parent" android:layout_height="match_parent"> </com.android.dragtest.DragView></LinearLayout> |
希望本文所述对大家Android程序设计有所帮助。
