侧滑删除进阶（三）

附上一张不是效果的效果图，之前图丢了，从新弄下，大概意思就是这个

activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <com.example.listviewitemslidedeletebtnshow.QQListView
        android:id="@+id/id_listview"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >
    </com.example.listviewitemslidedeletebtnshow.QQListView>

</RelativeLayout>

listview_item.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >

    <TextView
        android:id="@+id/id_item_tv"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/listbg_normal"
        android:gravity="center_vertical"
        android:text="helloworld" />

</RelativeLayout>

delete_btn.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <Button
        android:id="@+id/id_item_btn"
        android:layout_width="60dp"
        android:layout_height="wrap_content"
        android:layout_marginRight="15dp"
        android:background="@drawable/d_delete_btn"
        android:paddingLeft="15dp"
        android:paddingRight="15dp"
        android:singleLine="true"
        android:text="删除"
        android:textColor="#ffffff" />

</LinearLayout>

delete_btn_hide.xml

<?xml version="1.0" encoding="utf-8"?>

<set xmlns:android="http://schemas.android.com/apk/res/android">

<scale  android:interpolator="@android:anim/accelerate_decelerate_interpolator"

          android:fromXScale="1.0"
          android:toXScale="0.0"
          android:fromYScale="1.0"
          android:toYScale="1.0"
          android:pivotX="100%"
          android:pivotY="50%"
          android:fillAfter="false"
          android:duration="200" >

</scale>

</set>

delete_btn_show.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >

    <scale
        android:duration="200"
        android:fillAfter="false"
        android:fromXScale="0.0"
        android:fromYScale="1.0"
        android:interpolator="@android:anim/accelerate_decelerate_interpolator"
        android:pivotX="100%"
        android:pivotY="50%"
        android:toXScale="1.0"
        android:toYScale="1.0" >
    </scale>

</set>

MainActivity

package com.example.listviewitemslidedeletebtnshow;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Toast;

import com.example.listviewitemslidedeletebtnshow.QQListView.DelButtonClickListener;

public class MainActivity extends Activity {
	private QQListView mListView;
	private ArrayAdapter<String> mAdapter;
	private List<String> mDatas;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		mListView = (QQListView) findViewById(R.id.id_listview);
		// 不要直接Arrays.asList
		mDatas = new ArrayList<String>(Arrays.asList("HelloWorld", "Welcome",
				"Java", "Android", "Servlet", "Struts", "Hibernate", "Spring",
				"HTML5", "Javascript", "Lucene"));
		mAdapter = new ArrayAdapter<String>(this,
				android.R.layout.simple_list_item_1, mDatas);
		mListView.setAdapter(mAdapter);

		mListView.setDelButtonClickListener(new DelButtonClickListener() {
			@Override
			public void clickHappend(final int position) {
				Toast.makeText(MainActivity.this,
						position + " : " + mAdapter.getItem(position), 1)
						.show();
				mAdapter.remove(mAdapter.getItem(position));
			}
		});

		mListView.setOnItemClickListener(new OnItemClickListener() {
			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				Toast.makeText(MainActivity.this,
						position + " : " + mAdapter.getItem(position), 1)
						.show();
			}
		});
	}
}

QQListView

package com.example.listviewitemslidedeletebtnshow;

import android.content.Context;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.PopupWindow;

public class QQListView extends ListView {

	private static final String TAG = "QQlistView";

	// private static final int VELOCITY_SANP = 200;
	// private VelocityTracker mVelocityTracker;
	/**
	 * 用户滑动的最小距离
	 */
	private int touchSlop;

	/**
	 * 是否响应滑动
	 */
	private boolean isSliding;

	/**
	 * 手指按下时的x坐标
	 */
	private int xDown;
	/**
	 * 手指按下时的y坐标
	 */
	private int yDown;
	/**
	 * 手指移动时的x坐标
	 */
	private int xMove;
	/**
	 * 手指移动时的y坐标
	 */
	private int yMove;

	private LayoutInflater mInflater;

	private PopupWindow mPopupWindow;
	private int mPopupWindowHeight;
	private int mPopupWindowWidth;

	private Button mDelBtn;
	/**
	 * 为删除按钮提供一个回调接口
	 */
	private DelButtonClickListener mListener;

	/**
	 * 当前手指触摸的View
	 */
	private View mCurrentView;

	/**
	 * 当前手指触摸的位置
	 */
	private int mCurrentViewPos;

	/**
	 * 必要的一些初始化
	 *
	 * @param context
	 * @param attrs
	 */
	public QQListView(Context context, AttributeSet attrs) {
		super(context, attrs);

		mInflater = LayoutInflater.from(context);
		touchSlop = ViewConfiguration.get(context).getScaledTouchSlop();

		View view = mInflater.inflate(R.layout.delete_btn, null);
		mDelBtn = (Button) view.findViewById(R.id.id_item_btn);
		mPopupWindow = new PopupWindow(view,
				LinearLayout.LayoutParams.WRAP_CONTENT,
				LinearLayout.LayoutParams.WRAP_CONTENT);
		/**
		 * 先调用下measure,否则拿不到宽和高
		 */
		mPopupWindow.getContentView().measure(0, 0);
		mPopupWindowHeight = mPopupWindow.getContentView().getMeasuredHeight();
		mPopupWindowWidth = mPopupWindow.getContentView().getMeasuredWidth();
	}

	@Override
	public boolean dispatchTouchEvent(MotionEvent ev) {
		int action = ev.getAction();
		int x = (int) ev.getX();
		int y = (int) ev.getY();
		switch (action) {

		case MotionEvent.ACTION_DOWN:
			xDown = x;
			yDown = y;
			/**
			 * 如果当前popupWindow显示，则直接隐藏，然后屏蔽ListView的touch事件的下传
			 */
			if (mPopupWindow.isShowing()) {
				dismissPopWindow();
				return false;
			}
			// 获得当前手指按下时的item的位置
			mCurrentViewPos = pointToPosition(xDown, yDown);
			// 获得当前手指按下时的item
			View view = getChildAt(mCurrentViewPos - getFirstVisiblePosition());
			mCurrentView = view;
			break;
		case MotionEvent.ACTION_MOVE:
			xMove = x;
			yMove = y;
			int dx = xMove - xDown;
			int dy = yMove - yDown;
			/**
			 * 判断是否是从右到左的滑动
			 */
			if (xMove < xDown && Math.abs(dx) > touchSlop
					&& Math.abs(dy) < touchSlop) {
				isSliding = true;
			}
			break;
		}
		return super.dispatchTouchEvent(ev);
	}

	@Override
	public boolean onTouchEvent(MotionEvent ev) {
		int action = ev.getAction();
		/**
		 * 如果是从右到左的滑动才相应
		 */
		if (isSliding) {
			switch (action) {
			case MotionEvent.ACTION_MOVE:

				int[] location = new int[2];
				// 获得当前item的位置x与y
				mCurrentView.getLocationOnScreen(location);
				// 设置popupWindow的动画
				mPopupWindow
						.setAnimationStyle(R.style.popwindow_delete_btn_anim_style);
				mPopupWindow.update();
				/**
				 * location[0]为0
				 *
				 */
				mPopupWindow.showAtLocation(mCurrentView, Gravity.LEFT
						| Gravity.TOP, location[0] + mCurrentView.getWidth(),
						location[1] + mCurrentView.getHeight() / 2
								- mPopupWindowHeight / 2);
				// 设置删除按钮的回调
				mDelBtn.setOnClickListener(new OnClickListener() {
					@Override
					public void onClick(View v) {
						if (mListener != null) {
							mListener.clickHappend(mCurrentViewPos);
							mPopupWindow.dismiss();
						}
					}
				});
				// Log.e(TAG, "mPopupWindow.getHeight()=" + mPopupWindowHeight);

				break;
			case MotionEvent.ACTION_UP:
				isSliding = false;

			}
			// 相应滑动期间屏幕itemClick事件，避免发生冲突
			return true;
		}

		return super.onTouchEvent(ev);
	}

	/**
	 * 隐藏popupWindow
	 */
	private void dismissPopWindow() {
		if (mPopupWindow != null && mPopupWindow.isShowing()) {
			mPopupWindow.dismiss();
		}
	}

	public void setDelButtonClickListener(DelButtonClickListener listener) {
		mListener = listener;
	}

	interface DelButtonClickListener {
		public void clickHappend(int position);
	}

}

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