listview滑动删除

MainActivity

package com.example.administrator.listview;

import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;
import android.widget.Toast;

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

public class MainActivity extends Activity {

float x = 0;
float y = 0;
PopupWindow popupWindow;
private List<String> infoList;
public static int statusBarHeight = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

infoList = new ArrayList<String>();
for (int i = 0; i < 20; i++) {
infoList.add("item" + i);
}
MyDeleteListView listview = new MyDeleteListView(this);
final MyAdapter adapter = new MyAdapter(this, infoList);
listview.setAdapter(adapter);
listview.setOnItemDeleteCallback(new MyDeleteListView.OnDeleteCallback() {

@Override
public void onDelete(AdapterView<?> parent, int deletePosition) {
parent.getChildAt(deletePosition);
Toast.makeText(MainActivity.this,
infoList.get(deletePosition) + "，被删除了",
Toast.LENGTH_SHORT).show();
infoList.remove(deletePosition);
adapter.notifyDataSetChanged();
}
});
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
Toast.makeText(MainActivity.this,
infoList.get(position) + "，被点击了", Toast.LENGTH_SHORT)
.show();
}
});
setContentView(listview);
}

public class MyAdapter extends BaseAdapter implements ListAdapter {

private List<String> infoList;
private LayoutInflater inflater;

/**
* @param mainActivity
* @param infoList
*/
public MyAdapter(Context context, List<String> infoList) {
this.infoList = infoList;
this.inflater = LayoutInflater.from(context);
}

@Override
public int getCount() {
return infoList.size();
}

@Override
public Object getItem(int position) {
return null;
}

@Override
public long getItemId(int position) {
return 0;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (null == convertView)
convertView = inflater.inflate(R.layout.item, null);
final TextView textview = (TextView) convertView
.findViewById(R.id.item_tv);
textview.setText(infoList.get(position));
return convertView;
}
}

}

MyDeleteListView

package com.example.administrator.listview;import android.content.Context;import android.graphics.Color;import android.graphics.drawable.ColorDrawable;import android.util.AttributeSet;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.VelocityTracker;import android.view.View;import android.view.ViewConfiguration;import android.widget.AdapterView;import android.widget.ListView;import android.widget.PopupWindow;public class MyDeleteListView extends ListView {private LayoutInflater inflater;public MyDeleteListView(Context context) {super(context);inflater = LayoutInflater.from(context);ViewConfiguration vc = ViewConfiguration.get(context);mSlop = vc.getScaledTouchSlop();}public MyDeleteListView(Context context, AttributeSet attrs) {super(context, attrs);}public MyDeleteListView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);}@Overridepublic boolean onTouchEvent(MotionEvent ev) {switch (ev.getAction()) {case MotionEvent.ACTION_DOWN:handleActionDown(ev);break;case MotionEvent.ACTION_MOVE:return handleActionMove(ev);case MotionEvent.ACTION_UP:handleActionUp(ev);break;}return super.onTouchEvent(ev);}private float mDownX;private float mDownY;/*** 认为是用户滑动的�?��距离*/private int mSlop;private int mDownPosition;private OnDeleteCallback onDeleteCallback;/*** 用来标记用户是否正在滑动�?*/private boolean mSwiping;/*** 按下的item对应的View*/private View mDownView;/*** 滑动速度�?���?*/private VelocityTracker mVelocityTracker;/*** item的宽�?*/private int mViewWidth;/*** item的高�?*/private int mViewHeight;/*** 按下事件处理** @param ev* @return*/private void handleActionDown(MotionEvent ev) {mDownX = ev.getX();mDownY = ev.getY();mDownPosition = pointToPosition((int) mDownX, (int) mDownY);if (mDownPosition == AdapterView.INVALID_POSITION) {return;}mDownView = getChildAt(mDownPosition - getFirstVisiblePosition());if (mDownView != null) {mViewWidth = mDownView.getWidth();mViewHeight = mDownView.getHeight();}// 加入速度�?��mVelocityTracker = VelocityTracker.obtain();mVelocityTracker.addMovement(ev);}private PopupWindow popupWindow;/*** 手指抬起的事件处�?** @param ev*/private void handleActionUp(MotionEvent ev) {if (mVelocityTracker == null || mDownView == null || !mSwiping) {return;}if (ev.getX() < mDownX&& Math.abs(ev.getX() - mDownX) > Math.abs(ev.getY() - mDownY)) {// x轴左方向滑动showDeletePopup();}mSwiping = false;}private void showDeletePopup() {View deleteView = inflater.inflate(R.layout.layout_popupwindow, null);deleteView.findViewById(R.id.popupwindow_btn).setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {popupWindow.dismiss();if (onDeleteCallback != null) {onDeleteCallback.onDelete(MyDeleteListView.this,mDownPosition);}}});//measure deleteView  后才能获取宽�?int w = MeasureSpec.makeMeasureSpec(0,MeasureSpec.UNSPECIFIED);int h = MeasureSpec.makeMeasureSpec(0,MeasureSpec.UNSPECIFIED);deleteView.measure(w, h);int height = deleteView.getMeasuredHeight();int width = deleteView.getMeasuredWidth();popupWindow = new PopupWindow(deleteView, LayoutParams.WRAP_CONTENT,android.view.WindowManager.LayoutParams.WRAP_CONTENT, true);popupWindow.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));// 要设置背�?popupWindow.setAnimationStyle(R.style.AnimationPreview);// 动画popupWindow.showAsDropDown(mDownView, mViewWidth - width,-(mViewHeight - (mViewHeight - height) / 2));popupWindow.setFocusable(true);popupWindow.setOutsideTouchable(true);popupWindow.setTouchable(true);}/*** 处理手指滑动的方�?** @param ev* @return*/private boolean handleActionMove(MotionEvent ev) {if (mVelocityTracker == null || mDownView == null) {return super.onTouchEvent(ev);}float deltaX = ev.getX() - mDownX;float deltaY = ev.getY() - mDownY;// X方向滑动的距离大于mSlop并且Y方向滑动的距离小于mSlop，表示可以滑�?if (Math.abs(deltaX) > mSlop && Math.abs(deltaY) < mSlop) {mSwiping = true;// 当手指滑动item,取消item的点击事件，不然我们滑动Item也伴随着item点击事件的发�?MotionEvent cancelEvent = MotionEvent.obtain(ev);cancelEvent.setAction(MotionEvent.ACTION_CANCEL| (ev.getActionIndex() << MotionEvent.ACTION_POINTER_INDEX_SHIFT));onTouchEvent(cancelEvent);}if (mSwiping) {// 手指滑动的时�?返回true，表示SwipeDismissListView自己处理onTouchEvent,其他的就交给父类来处�?return true;}return super.onTouchEvent(ev);}public void setOnItemDeleteCallback(OnDeleteCallback onDeleteCallback) {this.onDeleteCallback = onDeleteCallback;}/*** 删除的回调接�?** @author xiaanming**/public interface OnDeleteCallback {public void onDelete(AdapterView<?> parent, int deletePosition);}}

Activity_main.xml

<?xml version="1.0" encoding="utf-8"?><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"android:paddingBottom="@dimen/activity_vertical_margin"android:paddingLeft="@dimen/activity_horizontal_margin"android:paddingRight="@dimen/activity_horizontal_margin"android:paddingTop="@dimen/activity_vertical_margin"tools:context="com.example.administrator.listview.MainActivity"><TextViewandroid:layout_width="wrap_content"android:layout_height="wrap_content"android:text="Hello World!" /></RelativeLayout>

item.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"android:padding="20dp" ><TextViewandroid:id="@+id/item_tv"android:layout_width="wrap_content"android:layout_height="wrap_content" /></LinearLayout>

layout_popupwindow.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:gravity="center"android:orientation="horizontal" ><Buttonandroid:id="@+id/popupwindow_btn"android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="#ff0000"android:padding="10dp"android:text="删  除"android:textColor="#ffffff" /></LinearLayout>

menu

<menu xmlns:android="http://schemas.android.com/apk/res/android" ><itemandroid:id="@+id/action_settings"android:orderInCategory="100"android:showAsAction="never" /></menu>