animation fade in and out not working

Question

Using this code for a fade in and out, it's not work. any ideas ?

public class MainActivity extends AppCompatActivity {

public void picChange(View view) {

    ImageView youngF = (ImageView) findViewById(R.id.firstPic);

    ImageView biggerF = (ImageView) findViewById(R.id.secondPic);


    youngF.animate().alpha(0f).setDuration(2000);
    biggerF.animate().alpha(1f).setDuration(2000);
}


public void back (View view) {

    ImageView youngBack = (ImageView) findViewById(R.id.firstPic);

    ImageView biggBack = (ImageView) findViewById(R.id.secondPic);

    biggBack.animate().alpha(0f).setDuration(2000);
    youngBack.animate().alpha(1f).setDuration(2000);

}

Using this code for a fade in and out, it's not work. any ideas ?

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

}

try this way-https://stackoverflow.com/questions/8720626/android-fade-in-and-fade-out-with-imageview/10471479 — Adil, May 29 '18 at 09:34

score 1 · Answer 1 · answered May 29 '18 at 09:43

Create XML File to Define Animation

For Fade In animation fade_in.xml

    <?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" android:interpolator="@android:anim/linear_interpolator">
   <alpha
        android:duration="2000"
        android:fromAlpha="0.1"
        android:toAlpha="1.0">
    </alpha>
</set>

For Fade Out animation fade_out.xml

 <?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/linear_interpolator">
    <alpha
        android:duration="2000"
        android:fromAlpha="1.0"
        android:toAlpha="0.1" >
    </alpha>
</set>

Then in MainActivity

public void picChange(View view) {

ImageView youngF = (ImageView) findViewById(R.id.firstPic);

ImageView biggerF = (ImageView) findViewById(R.id.secondPic);

Animation animFadeIn = AnimationUtils.loadAnimation(getApplicationContext(),R.anim.fade_in);
                img.startAnimation(animFadeIn);

Animation animFadeOut = AnimationUtils.loadAnimation(getApplicationContext(),R.anim.fade_out);
                    img.startAnimation(animFadeOut);

youngF.startAnimation(animFadeIn);
biggerF.startAnimation(animFadeOut);

}

score 0 · Answer 2 · answered May 29 '18 at 10:46

Animation fadeIn = new AlphaAnimation(0, 1);
    fadeIn.setInterpolator(new DecelerateInterpolator()); //add this
    fadeIn.setDuration(1000);

    Animation fadeOut = new AlphaAnimation(1, 0);
    fadeOut.setInterpolator(new AccelerateInterpolator()); //and this
    fadeOut.setStartOffset(1000);
    fadeOut.setDuration(1000);

    AnimationSet animation = new AnimationSet(false); //change to false
    animation.addAnimation(fadeIn);
    imgone.setAnimation(animation);

    AnimationSet animation1 = new AnimationSet(false); //change to false
    animation1.addAnimation(fadeOut);
    imgtwo.setAnimation(animation1);

animation fade in and out not working

2 Answers2