Android ListView 刪除動畫，androidlistview

Android ListView 刪除動畫，androidlistview

Android 的ListView在刪除時，被刪除的項目直接消失，比較生硬，在此實現一下刪除動畫，大家一起探討；

  以下是Activity代碼；主介面只有一個ListView，通過Adapter提供資料，介面如下，當點擊某一項時，將播放動畫，並刪除點擊的項目；

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 提供資料，提供remove方法，可以刪除指定的條目；
      *
      **/    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){
        // 獲得ListView第一個View的position        int firstVisiblePosition = mListView.getFirstVisiblePosition();
        // 儲存所有的Animator，利用AnimatorSet直接播放        ArrayList<Animator> animators = new ArrayList<Animator>();
　　　　 // 獲得要刪除的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);                // 動畫結束後，恢複ListView所有子View的屬性                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.xml.        int id = item.getItemId();        //noinspection SimplifiableIfStatement        if (id == R.id.action_settings) {            return true;        }        return super.onOptionsItemSelected(item);    }}