我使用約束佈局作爲根與3子視圖:幻燈片向上/向下SurfaceView在ConstraintLayout
- 的TextView
- 按鈕
- SurfaceView(View.Visibility =已刪除)
我想當我點擊Button時,SurfaceView出現(View.Visibility = Visible)from:
Y = - SurfaceView.height
到:
Y = 0
,當我點擊第二個時間上的按鈕,SurfaceView消失(View.Visibility =飄)從:
Y = 0
到:
Y = - SurfaceView.height
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="Animation"
android:textSize="30sp"
android:gravity="center"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="8dp"
android:layout_marginLeft="8dp"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginRight="8dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp" />
<Button
android:id="@+id/display_btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Dsiplay"
android:textSize="30sp"
android:layout_marginTop="8dp"
app:layout_constraintTop_toBottomOf="@+id/title"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="8dp"
android:layout_marginRight="8dp"
app:layout_constraintRight_toRightOf="parent"
android:layout_marginLeft="8dp"
app:layout_constraintLeft_toLeftOf="parent"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp" />
<SurfaceView
android:id="@+id/animation_view"
android:layout_width="0dp"
android:layout_height="150dp"
android:visibility="gone"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="8dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginEnd="8dp" />
</android.support.constraint.ConstraintLayout>
MainActivity:
public class MainActivity extends Activity {
boolean isVisible = false;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViewById(R.id.display_btn).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
isVisible = !isVisible;
if(isVisible){
/*
* Start Animation slide to down
* */
findViewById(R.id.animation_view).animate()
.translationY(0)
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
super.onAnimationStart(animation);
findViewById(R.id.animation_view).setY(-findViewById(R.id.animation_view).getHeight());
findViewById(R.id.animation_view).setVisibility(View.VISIBLE);
}
});
}
else {
/*
* Start Animation slide to up
* */
findViewById(R.id.animation_view).animate()
.translationY(-findViewById(R.id.animation_view).getHeight())
.setListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationStart(Animator animation) {
super.onAnimationStart(animation);
}
@Override
public void onAnimationEnd(Animator animation) {
super.onAnimationEnd(animation);
findViewById(R.id.animation_view).setVisibility(View.GONE);
}
});
}
}
});
}
}
當我點擊,第一次它不工作(滑下)。
'tranlationY()'移動視圖上下在屏幕上。如果你想動畫消失,你應該看看'scaleX()'和'scaleY'。 – Cheticamp
不,我只是想將視圖向下移動,但第一次(向下動畫)它只顯示得如此之快以至於它沒有動畫,我沒有看到任何移動。 –