java - setVisibilty() 未按预期工作

Question

package com.anilkrishna.cricketscores;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {
    TextView start;
    TextView credit;
    boolean flag=false;
    public void startApp()
    {
        start=(TextView)findViewById(R.id.start);
        start.animate().alpha(1).scaleX(1f).scaleY(1f).setDuration(3000);
        credit=(TextView)findViewById(R.id.credit);
        credit.animate().alpha(1).scaleX(1f).scaleY(1f).setDuration(3000);
        credit.animate().alpha(1).scaleX(1f).scaleY(1f).setDuration(2000);
        start.setVisibility(View.GONE);
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        startApp();
    }
}

我的要求是应用程序必须显示 TextView 、动画然后消失，但是动画没有发生，并且应用程序启动后 TextViews 不可见。

Answer 1

在它有机会制作动画之前，您就将开始设置为“GONE”。考虑在您的 Activity 上实现 Animation.AnimationListener，然后在 onAnimationEnd 方法中设置可见性。

public class MainActivity extends AppCompatActivity implements Animation.AnimationListener {

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

    animation = AnimationUtils.loadAnimation(this, R.anim.some_animation); 
    animation.setAnimationListener(this); 

}

@Override
protected void onStart() {
    super.onStart();
    start.startAnimation(animation);
}

@Override
public void onAnimationStart(Animation animation) {

}

@Override
public void onAnimationEnd(Animation animation) {
     start.setVisibility(Visibility.GONE); 
}

@Override
public void onAnimationRepeat(Animation animation) {

}
}