Question

以下是动画xml中的内容：

android:fromAlpha="0.0"
android:toAlpha="1.0"
android:duration="4500"

在这里我称之为：

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    overridePendingTransition(R.anim.fade_in, R.anim.fade_out);
    setContentView(R.layout.prayerlayout);

    txt = (TextView) findViewById(R.id.textView2); 
    txt.setText(getString(R.string.eighth));

//apply animation 
     fade1 = AnimationUtils.loadAnimation(this, R.anim.fade10);
     txt.startAnimation(fade1);
 }

问题是文本在动画持续时间内没有显示，然后突然出现。在旧版本的android中我没有注意到这个问题。它工作得很好，但是使用Lollipop或Jellybeans它并不起作用。谢谢你的帮助。

Answer 1

事实证明我的文字太长导致淡入动画无效。我在scrollView上应用了动画，它实现了我想要的效果。

Answer 2

我在fadein XML中有这个。

 <?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillAfter="true">
    <alpha
        android:duration="1000"
        android:fromAlpha="0.0"
        android:interpolator="@android:anim/accelerate_interpolator"
        android:toAlpha="1.0" />
</set>

代码

public class MainActivity extends Activity {
    Animation animFadein,animFadeout;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        setContentView(R.layout.activity_main);

        animFadein = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.fade_in);
        animFadeout = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.fade_out);
        Update();
    } 

    public void Update(){
        TextView lblEstadoPuerta = (TextView) findViewById(R.id.lblEstadoPuerta);
        ImageButton btnabrirpuerta = (ImageButton) findViewById(R.id.btndoorstate);

        btnabrirpuerta.startAnimation(animFadeout);
        btnabrirpuerta.setVisibility(View.GONE);
        btnabrirpuerta.setImageResource(R.drawable.go_down);
        btnabrirpuerta.setVisibility(View.VISIBLE);
        btnabrirpuerta.startAnimation(animFadein);
    }
}

需要导入此..

import android.view.animation.Animation;
import android.view.animation.AnimationUtils;

Answer 3

你添加了一些内插器吗？你可以读到这个： http://developer.android.com/intl/es/guide/topics/resources/animation-resource.html

您的fade10.xml动画文件

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<alpha
    android:duration="4500"
    android:fromAlpha="0.0"
    android:interpolator="@android:anim/accelerate_interpolator"
    android:toAlpha="1.0" />
</set>

您的活动文件

public class FadeActivity extends Activity {

    private TextView txt;
    private Animation fade1;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.prayerlayout);

        txt = (TextView) findViewById(R.id.textView2);
        txt.setText(getString(R.string.eighth));

        //apply animation
        fade1 = AnimationUtils.loadAnimation(this, R.anim.fade10);
        txt.startAnimation(fade1);
    }
}

Android TextView淡入动画无效

3 个答案: