[英]Animation doesn't end - Android
在我的應用程序中,我有一個顯示下拉菜單的按鈕,在該菜單中我們有一些選項,其中之一是“擲硬幣”,此選項的目的是輕松擲硬幣 animation,即 animation出現在 textView 中,並顯示硬幣的正面或反面,而不是 textView 中的文字。我有兩個問題:
XML下拉菜單:
<item
android:id="@+id/flipacoin"
android:title="@string/flipACoin" />
<item
android:id="@+id/rolladice"
android:title="@string/rollADice" />
<item
android:id="@+id/imagebackground"
android:title="@string/changeImage" />
JAVA調用 animation function 的代碼:
@Override
public boolean onMenuItemClick(MenuItem item) {
switch (item.getItemId()){
case R.id.flipacoin:
flipACoin();
return true;
case R.id.rolladice:
Toast.makeText(this,"TODO roll a dice",Toast.LENGTH_SHORT).show();
return true;
case R.id.imagebackground:
Toast.makeText(this,"TODO image background",Toast.LENGTH_SHORT).show();
return true;
default:
return false;
}
}
JAVA animation function:
public void flipACoin(){
coin.setText(null); //this is for remove the text inside the textView
coin.setBackground(RANDOM.nextFloat() > 0.5f ? getResources().getDrawable(R.drawable.tails) : getResources().getDrawable(R.drawable.heads));
Animation fadeIn = new AlphaAnimation(0, 1);
fadeIn.setInterpolator(new DecelerateInterpolator());
fadeIn.setDuration(1000);
Animation fadeOut = new AlphaAnimation(1, 0);
fadeOut.setInterpolator(new AccelerateInterpolator());
fadeOut.setStartOffset(2000);
fadeOut.setDuration(1000);
AnimationSet animation = new AnimationSet(false);
animation.addAnimation(fadeIn);
animation.addAnimation(fadeOut);
coin.setAnimation(animation);
}
當您在開始時設置背景時,它只停留在 animation 之后。要將文本和背景設置回 null,您可以添加 Animation 偵聽器。 下面是執行此操作的示例應用程序:
public class MainActivity extends AppCompatActivity
{
TextView coin;
Random RANDOM;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RANDOM = new Random();
coin = findViewById(R.id.coin);
(findViewById(R.id.click)).setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
flipACoin();
}
});
}
public void flipACoin()
{
coin.setText(null);
coin.setBackground(ResourcesCompat.getDrawable(getResources(),
RANDOM.nextFloat() > 0.5f ? R.drawable.ic_launcher_background : R.drawable.ic_launcher_foreground,
null
));
Animation fadeIn = new AlphaAnimation(0, 1);
fadeIn.setInterpolator(new DecelerateInterpolator());
fadeIn.setDuration(1000);
Animation fadeOut = new AlphaAnimation(1, 0);
fadeOut.setInterpolator(new AccelerateInterpolator());
fadeOut.setStartOffset(2000);
fadeOut.setDuration(1000);
AnimationSet animation = new AnimationSet(false);
animation.addAnimation(fadeIn);
animation.addAnimation(fadeOut);
// listener, it will execute function when animation starts/ends/repeats
animation.setAnimationListener(new Animation.AnimationListener()
{
@Override
public void onAnimationStart(Animation animation)
{
Log.d("MyTag", "onAnimationStart:");
}
@Override
public void onAnimationEnd(Animation animation) // when animation ends, set text and background to null
{
Log.d("MyTag", "onAnimationEnd:");
coin.setBackground(null);
coin.setText("Default");
}
@Override
public void onAnimationRepeat(Animation animation)
{
Log.d("MyTag", "onAnimationRepeat:");
}
});
coin.setAnimation(animation);
}
}
activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
>
<Button
android:id="@+id/click"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="click"
/>
<TextView
android:id="@+id/coin"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Default"
/>
</androidx.appcompat.widget.LinearLayoutCompat>
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.