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
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
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
<?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。
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