Android未对相对布局进行动画化

Question

我正在创建一个我想要的相对布局，应该从上面滑到布局，所以这里是我所做的

1. 使布局不可见
2. 在oncreate中将屏幕上方的布局动画化
3. 在onWindowsFocusChanged（）中，我调用了动画，使布局可见，并希望布局滑入屏幕

但是

当视图被创建时，布局在其正确的位置，显示任何来自屏幕顶部的滑动效果

public class OverlayActivity extends Activity implements View.OnClickListener {
  RelativeLayout question_box;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_overlay);
// Slide Up the INVISIBLE layout so that I can call it by animation back to its original position

        question_box = findViewById(R.id.question_box);
        question_box.animate().translationY(-question_box.getHeight());


        final Window window = getWindow();
        window.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
                | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);
      
    }

    public void animateInObjects() {
        question_box.setVisibility(View.VISIBLE);
        question_box.animate().setDuration(1000).translationY(0);
    }

    @Override
    public void onClick(View v) {
//Some Code
    }

    @Override
    protected void onStop() {
        super.onStop();
        finish();
    }

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        animateInObjects();
        super.onWindowFocusChanged(hasFocus);
    }

}

布局

    <RelativeLayout
        android:id="@+id/question_box"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@android:color/transparent"
        android:layout_marginTop="5dp"
        android:layout_below="@+id/ad_view_container"
        android:visibility="invisible">

        <TextView
            android:id="@+id/question"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/questiontext"
            android:paddingStart="20dp"
            android:paddingTop="7dp"
            android:paddingEnd="20dp"
            android:paddingBottom="20dp"
            android:text="@string/sample_question"
            android:textAlignment="center"
            android:textColor="@color/text_quest"
            android:textSize="23sp" />

        <View
            android:id="@+id/center_vertical"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_centerVertical="true" />

        <LinearLayout
            android:id="@+id/cover_opt1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/question"
            android:layout_marginStart="15dp"
            android:layout_marginTop="10dp"
            android:background="@drawable/main_layout">

            <Button
                android:id="@+id/opt1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginVertical="1dp"
                android:layout_marginHorizontal="2dp"
                android:background="@android:color/transparent"
                android:text="@string/sample_number"
                android:textAlignment="center"
                android:textColor="@color/text_quest"
                android:textSize="18sp" />
        </LinearLayout>

        <LinearLayout
            android:id="@+id/cover_opt2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/question"
            android:layout_centerHorizontal="true"
            android:layout_marginTop="10dp"
            android:background="@drawable/main_layout">

            <Button
                android:id="@+id/opt2"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginVertical="1dp"
                android:layout_marginHorizontal="2dp"
                android:background="@android:color/transparent"
                android:text="@string/sample_number"
                android:textAlignment="center"
                android:textColor="@color/text_quest"
                android:textSize="18sp" />
        </LinearLayout>

        <LinearLayout
            android:id="@+id/cover_opt3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@+id/question"
            android:layout_alignParentEnd="true"
            android:layout_marginTop="10dp"
            android:layout_marginEnd="15dp"
            android:background="@drawable/main_layout">

            <Button
                android:id="@+id/opt3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginVertical="1dp"
                android:layout_marginHorizontal="2dp"
                android:background="@android:color/transparent"
                android:text="@string/sample_number"
                android:textAlignment="center"
                android:textColor="@color/text_quest"
                android:textSize="18sp" />
        </LinearLayout>

    </RelativeLayout>

这是activity的主题

<style name="Theme.Lockscreen" parent="Theme.AppCompat.NoActionBar">
        <item name="android:background">#33000000</item>
        <item name="android:windowNoTitle">true</item>
        <item name="android:windowBackground">@android:color/transparent</item>
        <item name="android:colorBackgroundCacheHint">@null</item>
        <item name="android:windowIsTranslucent">true</item>
        <item name="android:windowAnimationStyle">@android:style/Animation</item>
    </style>

Answer 1

您可以尝试在onCreate方法中动画视图。首先，视图尚未绘制，您得到的是getheight=0。因此，在使用view.GetViewTreeObserver().AddongLoballayoutListener绘制视图时，您必须等待才能对其进行动画

您需要在onCreate（）中添加以下内容：

   @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity2);
// Slide Up the INVISIBLE layout so that I can call it by animation back to its original position

        question_box = findViewById(R.id.question_box);

        question_box.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                if (question_box.getHeight() != 0)
                    question_box.animate().translationY(-question_box.getHeight());
            }
        });

        final Window window = getWindow();
        window.addFlags(WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
                | WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON | WindowManager.LayoutParams.FLAG_DISMISS_KEYGUARD);

    }