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；

images/loading.gif' data-original="http://images.cnitblog.com/blog2015/364762/201505/122252077519697.gif" />

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<String> mItems;    public Adapter(Context c,String [] data) {      super();      mContext = c;      mItems = new ArrayList<String>();      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<Animator> animators = new ArrayList<Animator>();
　　　　 // 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<mListView.getChildCount();++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.



原标题：Android ListView 删除动画
关键词：Android