动画删除 ListView 项

Question

我正在尝试使用此动画删除 ListView 项：

    mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, final View view, final int i, long l) {
            view.animate().setDuration(500).x(-view.getWidth()).alpha(0f);
            adapter.remove(tasks.get(i));
            adapter.notifyDataSetChanged();
        }
    });

它不起作用。我基本上遵循了这篇文章顶部第四个答案的建议：

How to Animate Addition or Removal of Android ListView Rows

但是，有一些有趣的绘图内容正在进行，或者回收，或者因为当动画发生时，滑出屏幕的项目下方的项目也因某种原因被删除。不幸的是，提问者最终标记为正确的答案是针对整个 Android 源的 RTFM。我已经查看了那里，但在 JellyBean 中找不到我试图模拟的通知下拉菜单。

TIA。 约翰

Answer 1

想法：当用户选择行时我开始动画。动画完成后，我从适配器中删除该行。以下代码为所选行设置动画：

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

    final ListView listView = (ListView) findViewById(R.id.listView1);
    final ArrayList<String> values = new ArrayList<String>();
    values.add("Android");
    values.add("iPhone");
    values.add("WindowsMobile");
    values.add("Blackberry");
    values.add("Windows7");

    final ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, android.R.id.text1, values);
    listView.setAdapter(adapter);

    final Animation animation = AnimationUtils.loadAnimation(this,
            R.anim.slide_out);
    animation.setAnimationListener(new AnimationListener() {
        @Override
        public void onAnimationStart(Animation animation) {
        }

        @Override
        public void onAnimationRepeat(Animation animation) {
        }

        @Override
        public void onAnimationEnd(Animation animation) {
            adapter.remove(adapter.getItem(selectedRow));
            adapter.notifyDataSetChanged();
        }
    });

    listView.setOnItemClickListener(new OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
            Toast.makeText(getApplicationContext(),
                    " " + values.get(position), Toast.LENGTH_LONG).show();
            view.startAnimation(animation);
            selectedRow = position;

        }

    });
}

slide_out.xml 文件：

<?xml version="1.0" encoding="utf-8"?>
 <set xmlns:android="http://schemas.android.com/apk/res/android" >  
    <translate 
        android:fromYDelta="0%" 
        android:toYDelta="100%"  
        android:duration="@android:integer/config_mediumAnimTime"/>  
</set> 

Answer 2

我刚刚找到了一个漂亮的解决方案：https://github.com/paraches/ListViewCellDeleteAnimation

这里是视频：http://www.youtube.com/watch?v=bOl5MIti7n0

非常感谢'paraches' ;)

编辑

从 Android 版本 22.0.0 开始，新的 android.support.v7.widget.RecyclerView 可作为 ListView 的后续版本。标准的添加/删除/更新动画开箱即用。小部件动画也很容易自定义 (few custom animations)。

如果您需要自定义项目动画，我强烈建议您从 ListView 切换到 RecyclerView。

Answer 3

正如 Chet Haase 在 DevBytes 中指出的那样，https://www.youtube.com/watch?v=8MIfSxgsHIs，所有这些都将起作用，但不要忘记添加瞬态状态标志。

来自他的代码：

// Here's where the problem starts - this animation will animate a View object.
                    // But that View may get recycled if it is animated out of the container,
                    // and the animation will continue to fade a view that now contains unrelated
                    // content.
                    ObjectAnimator anim = ObjectAnimator.ofFloat(view, View.ALPHA, 0);
                    anim.setDuration(1000);
                    if (setTransientStateCB.isChecked()) {
                        // Here's the correct way to do this: if you tell a view that it has
                        // transientState, then ListView ill avoid recycling it until the
                        // transientState flag is reset.
                        // A different approach is to use ViewPropertyAnimator, which sets the
                        // transientState flag internally.
                        view.setHasTransientState(true);
                    }
                    anim.addListener(new AnimatorListenerAdapter() {
                        @Override
                        public void onAnimationEnd(Animator animation) {
                            cheeseList.remove(item);
                            adapter.notifyDataSetChanged();
                            view.setAlpha(1);
                            if (setTransientStateCB.isChecked()) {
                                view.setHasTransientState(false);
                            }
                        }
                    });
                    anim.start();

Answer 4

我在刷新 ListView 时使用了从上到下的幻灯片动画。这是我使用的代码：

 adapter.notifyDataSetChanged();
 Animation animation = AnimationUtils.loadAnimation(
                    getApplication(), R.anim.slide_top_to_bottom);
 getListView().startAnimation(animation);
 getListView().setSelection(0);

和slide_top_to_bottom.xml（保存在res/anim文件夹中）

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

<set xmlns:android="http://schemas.android.com/apk/res/android"   android:interpolator="@android:anim/accelerate_interpolator">
<translate android:fromYDelta="-100%" android:toXDelta="0" android:duration="100" />
<alpha android:fromAlpha="0.0" android:toAlpha="1.0" android:duration="50" />
</set>

编辑： 试试这个：

mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, final View view, final int i, long l) {

    ValueAnimator fader = ObjectAnimator.ofFloat(view, "alpha", 1, 0);
    AnimatorSet animation = new AnimatorSet();
    animation.addListener(new AnimatorListener() {
        @Override
        public void onAnimationStart(Animator animation) {

        }
        @Override
        public void onAnimationRepeat(Animator animation) {
        }
        @Override
        public void onAnimationEnd(Animator animation) {

        }
        @Override
        public void onAnimationCancel(Animator animation) {
        }
    });
    ((AnimatorSet) animation).play(fader);
    animation.setDuration(500);
    animation.start();
    adapter.remove(tasks.get(i));
    adapter.notifyDataSetChanged();
}
});