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Android实现拖拽GridView到目标View
来源:互联网   发布日期:2015-10-03 10:49:26   浏览:3055次  

导读:[java]瀀愀挀欀愀最攀 cn.com.weather.serviceDemo.view;椀洀瀀漀爀琀 cn.com.weather.serviceDemo.interfaces...

[java]

package cn.com.weather.serviceDemo.view;

import cn.com.weather.serviceDemo.interfaces.OnDropListener;

import cn.com.weather.serviceDemo.util.DeviceUtil;

import android.content.Context;

import android.graphics.Bitmap;

import android.graphics.Matrix;

import android.graphics.PixelFormat;

import android.util.AttributeSet;

import android.view.Gravity;

import android.view.MotionEvent;

import android.view.View;

import android.view.ViewGroup;

import android.view.WindowManager;

import android.widget.AdapterView;

import android.widget.GridView;

import android.widget.ImageView;

public class MyGridView extends GridView{

private ImageView dragImageView;

private WindowManager windowManager;

private WindowManager.LayoutParams windowParams;

private int dragSrcPosition;//开始拖拽项

private int dragPosition;

//移动的位置

private int dragPointX;

private int dragPointY;

//当前位置距离边界的位置

private int dragOffsetX;

private int dragOffsetY;

private View myView;//目标view

private int dropPosition = -1;//选中项

private OnDropListener onDropListener;

public MyGridView(Context context, AttributeSet attrs) {

super(context, attrs);

}

public void setView(View view){

myView = view;

}

public void setOnDropListener(OnDropListener onDropListener){

this.onDropListener = onDropListener;

}

private boolean setOnItemLongClickListener(final MotionEvent ev){

this.setOnItemLongClickListener(new OnItemLongClickListener() {

@Override

public boolean onItemLongClick(AdapterView<?> parent, View view,

int position, long id) {

final int x = (int)ev.getX();//触摸点相对于GridView的坐标

final int y = (int)ev.getY();

dragSrcPosition = dragPosition = position;

if(dragPosition == AdapterView.INVALID_POSITION ){

return false;

}

final ViewGroup item = (ViewGroup)getChildAt(dragPosition - getFirstVisiblePosition());

dragPointX = x - item.getLeft();

dragPointY = y - item.getTop();

dragOffsetX = (int)ev.getRawX() - x;

dragOffsetY = (int)ev.getRawY() - y;

item.destroyDrawingCache();//清除cache

item.setDrawingCacheEnabled(true);

Bitmap bitmap = Bitmap.createBitmap(item.getDrawingCache());

startDrag(getScaleBitmap(bitmap), x, y);

DeviceUtil.Vibrate(getContext(), 100);

return false;

}

});

return super.onInterceptTouchEvent(ev);

}

@Override

public boolean onInterceptTouchEvent(MotionEvent ev) {

if(ev.getAction() == MotionEvent.ACTION_DOWN){

return setOnItemLongClickListener(ev);

}

return super.onInterceptTouchEvent(ev);

}

@Override

public boolean onTouchEvent(MotionEvent ev) {

if(dragImageView != null && dragPosition != AdapterView.INVALID_POSITION){

int x = (int)ev.getX();

int y = (int)ev.getY();

switch (ev.getAction()) {

case MotionEvent.ACTION_UP:

stopDrag();

onDrop((int)ev.getRawX(), (int)ev.getRawY());

break;

case MotionEvent.ACTION_MOVE:

onDrag(x, y);

break;

}

}

return super.onTouchEvent(ev);

}

private void startDrag(Bitmap bm, int x, int y){

stopDrag();

windowParams = new WindowManager.LayoutParams();

windowParams.gravity = Gravity.TOP|Gravity.LEFT;

//左上角相对于屏幕的坐标

windowParams.x = x - dragPointX + dragOffsetX;

windowParams.y = y - dragPointY + dragOffsetY;

windowParams.height = WindowManager.LayoutParams.WRAP_CONTENT;

windowParams.width = WindowManager.LayoutParams.WRAP_CONTENT;

windowParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE

| WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE

| WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON

| WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN;

windowParams.format = PixelFormat.TRANSLUCENT;

windowParams.windowAnimations = 0;

ImageView imageView = new ImageView(this.getContext());

imageView.setImageBitmap(bm);

windowManager = (WindowManager)this.getContext().getSystemService(Context.WINDOW_SERVICE);

windowManager.addView(imageView, windowParams);

dragImageView = imageView;

}

private void stopDrag(){

if (dragImageView != null) {

windowManager.removeView(dragImageView);

dragImageView = null;

}

}

private void onDrag(int x, int y){

if(dragImageView != null){

windowParams.alpha = 0.8f;

windowParams.x = x - dragPointX + dragOffsetX;

windowParams.y = y - dragPointY + dragOffsetY;

windowManager.updateViewLayout(dragImageView, windowParams);

}

}

private void onDrop(int x, int y){

boolean inView = isInView(x, y, myView);

if(inView){

if(onDropListener!=null){

onDropListener.onDrop(dragSrcPosition);

}

}

}

private Bitmap getScaleBitmap(Bitmap bitmap){

Matrix matrix = new Matrix();

matrix.postScale(1.1f, 1.1f);

return Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);

}

private boolean isInView(int x, int y, View view){

if(view == null) return false;

int[] location = new int[2];

view.getLocationInWindow(location);

int _x = location[0];

int _y = location[1];

int width = view.getWidth();

int height = view.getHeight();

if(_x <x && x <_x+width && _y<y && y<_y+height){

return true;

}

return false;

}

}

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