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 ;
}
}
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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);
}
}
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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 >
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希望本文所述对大家Android程序设计有所帮助。