如何为线性 recyclerView 创建爆炸动画

如何解决如何为线性 recyclerView 创建爆炸动画

我正在尝试为我的线性布局回收视图制作爆炸动画。所以当我按下屏幕时，所有的项目都很好地飞走了。但出于某种原因，动画一开始，它就只发生在屏幕非常狭窄的部分，其他一切都被切掉了。

这里是主要活动代码：

package com.stanislav.disturber;
   
import...

public class MainActivity extends AppCompatActivity {
    List<Alarm> alarms;
    RecyclerView recyclerView;

    private final int DND_OFF = 0;
    private final int DND_ON = 1;

    @SuppressLint("ClickableViewAccessibility")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            Window w = getWindow(); // in Activity's onCreate() for instance
            w.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
        }


        alarms = new ArrayList<>();
        Alarm firstAlarm = new Alarm("This is the on alarm\n\n");
        firstAlarm.setAlarmKind(DND_ON);
        alarms.add(firstAlarm);

        Alarm thAlarm = new Alarm("And this one is the off alarm\n\n");
        secondAlarm.setAlarmKind(DND_OFF);
        alarms.add(thAlarm);
...

        Alarm niAlarm = new Alarm("And this one is the off alarm\n\n");
        secondAlarm.setAlarmKind(DND_OFF);
        alarms.add(niAlarm);


        recyclerView = findViewById(R.id.recycler_view);
        recyclerView.setOverScrollMode(View.OVER_SCROLL_NEVER);
        DisturberAdapter disturberAdapter = new DisturberAdapter(alarms,this);
        LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,true);
        linearLayoutManager.scrollToPosition(alarms.size()-1);
        RecyclerView.ItemAnimator itemAnimator = new DefaultItemAnimator();

        recyclerView.setAdapter(disturberAdapter);
        recyclerView.setLayoutManager(linearLayoutManager);
        recyclerView.setItemAnimator(itemAnimator);
        linearLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);

        recyclerView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v,MotionEvent event) {
                // save rect of view in screen coordinates
                final Rect viewRect = new Rect();
                v.getGlobalVisibleRect(viewRect);

                // create Explode transition with epicenter
                Transition explode = new Explode();
                explode.setEpicenterCallback(new Transition.EpicenterCallback() {
                    @Override
                    public Rect onGetEpicenter(Transition transition) {
                        return viewRect;
                    }
                });
                explode.setDuration(7000);
                TransitionManager.beginDelayedTransition(recyclerView,explode);

                // remove all views from Recycler View
                recyclerView.setAdapter(null);
                return false;
            }
        });

    }
}

解决方法

发现当recyclerview的高度设置为“包裹内容”时出现问题。但是如果没有“包装内容”，如果只有很少的卡片，在地球上怎么会有卡片？

此外，当高度设置为“包裹内容”时，导致问题的原因是什么 - 在 recyclerview 中填充！！奇怪！

一个临时的解决方案是：在动画例程中，添加以下行，给recyclerview提供非常可笑的填充。然后一切都会好起来的。只是不要忘记在之后返回之前的填充！！代码：

 recyclerView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v,MotionEvent event) {
                
                //Set enormous padding
                recyclerView.setPadding(0,2000,2000);
                
                
                // save rect of view in screen coordinates
                final Rect viewRect = new Rect();
                //v.getGlobalVisibleRect(viewRect);

                //create Explode transition with epicenter
                Transition explode = new Explode();
                explode.setEpicenterCallback(new Transition.EpicenterCallback() {
                    @Override
                    public Rect onGetEpicenter(Transition transition) {
                        return viewRect;
                    }
                });

                explode.setDuration(600);
                TransitionManager.beginDelayedTransition(recyclerView,explode);


                // remove all views from Recycler View
                recyclerView.setAdapter(null);
                return false;
            }
        });