android listview remove 动画,Android ListView 剔除动画

Android ListView 删除动画

Android 的ListView在删除时，被删除的项目直接消失，比较生硬，在此实现一下删除动画，大家一起探讨；

以下是Activity代码；主界面只有一个ListView，通过Adapter提供数据，界面如下，当点击某一项时，将播放动画，并删除点击的项目；

package app.com.listviewdeleteanimation;

import android.animation.Animator;

import android.animation.AnimatorSet;

import android.animation.ObjectAnimator;

import android.content.Context;

import android.support.v7.app.ActionBarActivity;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.ViewGroup;

import android.view.animation.AccelerateDecelerateInterpolator;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.BaseAdapter;

import android.widget.ListView;

import android.widget.TextView;

import java.util.ArrayList;

public class MainActivity extends ActionBarActivity implements ListView.OnItemClickListener{

/**

* Adapter 提供数据，提供remove方法，可以删除指定的条目；

*

**/

public class Adapter extends BaseAdapter{

private Context mContext;

private ArrayList mItems;

public Adapter(Context c,String [] data) {

super();

mContext = c;

mItems = new ArrayList();

for (String item : data){

mItems.add(item);

}

}

public void remove(int position){

if(position < mItems.size()){

mItems.remove(position);

}

notifyDataSetChanged();

}

@Override

public int getCount() {

return mItems.size();

}

@Override

public int getItemViewType(int position) {

// current menu type

return position;

}

@Override

public String getItem(int position) {

return mItems.get(position);

}

@Override

public boolean isEmpty() {

return mItems.isEmpty();

}

@Override

public long getItemId(int position) {

return position;

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

if (convertView == null) {

convertView = LayoutInflater.from(mContext).inflate(

android.R.layout.simple_list_item_1, parent, false);

}

TextView tv = (TextView) convertView;

tv.setText(getItem(position));

return convertView;

}

}

private ListView mListView;

private Adapter mAdapter;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

mListView = (ListView)findViewById(R.id.listView);

mAdapter = new Adapter(this, new String[] {"1","2","3","4","5","6","7",});

mListView.setAdapter(mAdapter);

mListView.setOnItemClickListener(this);

}

@Override

public void onItemClick(AdapterView> parent, View view, final int position, long id){

// 获得ListView第一个View的position

int firstVisiblePosition = mListView.getFirstVisiblePosition();

// 存储所有的Animator，利用AnimatorSet直接播放

ArrayList animators = new ArrayList();

// 获得要删除的View

View itemToDelete = mListView.getChildAt(position - firstVisiblePosition);

int viewHeight = itemToDelete.getHeight();

int dividerHeight = mListView.getDividerHeight();

ObjectAnimator hideAnimator = ObjectAnimator.ofFloat(itemToDelete, "alpha",1f, 0f);

animators.add(hideAnimator);

int delay = 0;

int firstViewToMove = position + 1;

for (int i=firstViewToMove;i < mListView.getChildCount(); ++i){

View viewToMove = mListView.getChildAt(i);

ObjectAnimator moveAnimator = ObjectAnimator.ofFloat(viewToMove, "translationY", 0, -dividerHeight-viewHeight);

moveAnimator.setInterpolator(new AccelerateDecelerateInterpolator());

moveAnimator.setStartDelay(delay);

delay += 100;

animators.add(moveAnimator);

}

AnimatorSet set = new AnimatorSet();

set.addListener(new Animator.AnimatorListener() {

@Override

public void onAnimationStart(Animator animation) {}

@Override

public void onAnimationEnd(Animator animation) {

mAdapter.remove(position);

// 动画结束后，恢复ListView所有子View的属性

for (int i=0;i

View v = mListView.getChildAt(i);

v.setAlpha(1f);

v.setTranslationY(0);

}

}

@Override

public void onAnimationCancel(Animator animation) {}

@Override

public void onAnimationRepeat(Animator animation) {}

});

set.playTogether(animators);

set.start();

}

@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.menu_main, menu);

return true;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

// Handle action bar item clicks here. The action bar will

// automatically handle clicks on the Home/Up button, so long

// as you specify a parent activity in AndroidManifest.xml.

int id = item.getItemId();

//noinspection SimplifiableIfStatement

if (id == R.id.action_settings) {

return true;

}

return super.onOptionsItemSelected(item);

}

}