public class MainActivity extends AppCompatActivity {
private Button mSignUpBtn;
private ImageView mLeftLogoImg;
private ImageView mRightLogoImg;
private TextView mDescTitleTextView;
private LinearLayout mLettersLayout;
private LinearLayout mSignInLayout;
private ArrayList<SpringAnimation> mLetterAnims;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// hide the status ui.
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
// get the screen height.
DisplayMetrics dm = getResources().getDisplayMetrics();
int screenHeight = dm.heightPixels;
// letters about 'Converse'
mLettersLayout = (LinearLayout) findViewById(R.id.letter_layout);
mLetterAnims = new ArrayList<>();
for (int i = 0; i < mLettersLayout.getChildCount(); i++) {
View letterView = mLettersLayout.getChildAt(i);
letterView.setTranslationY(screenHeight);
SpringAnimation letterAnimY = new SpringAnimation(letterView, SpringAnimation.TRANSLATION_Y, 0);
letterAnimY.getSpring().setStiffness(SpringForce.STIFFNESS_VERY_LOW);
letterAnimY.getSpring().setDampingRatio(SpringForce.DAMPING_RATIO_LOW_BOUNCY);
mLetterAnims.add(letterAnimY);
}
// text about 'Native messaging'
mDescTitleTextView = (TextView) findViewById(R.id.desc_title_textview);
mDescTitleTextView.setTranslationY(500f);
mDescTitleTextView.setAlpha(0f);
final SpringAnimation descTitleAnimY = new SpringAnimation(mDescTitleTextView, DynamicAnimation.TRANSLATION_Y, 0);
descTitleAnimY.getSpring().setStiffness(SpringForce.STIFFNESS_VERY_LOW);
descTitleAnimY.getSpring().setDampingRatio(SpringForce.DAMPING_RATIO_LOW_BOUNCY);
final ValueAnimator descTitleAlphaAnim = ObjectAnimator.ofFloat(0f, 1f);
descTitleAlphaAnim.setDuration(300);
descTitleAlphaAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
mDescTitleTextView.setAlpha((Float) valueAnimator.getAnimatedValue());
}
});
// the button of sign up
mSignUpBtn = (Button) findViewById(R.id.sign_up_btn);
mSignUpBtn.setTranslationY(500f);
final SpringAnimation signUpBtnAnimY = new SpringAnimation(mSignUpBtn, SpringAnimation.TRANSLATION_Y, 0);
signUpBtnAnimY.getSpring().setStiffness(SpringForce.STIFFNESS_VERY_LOW);
signUpBtnAnimY.getSpring().setDampingRatio(SpringForce.DAMPING_RATIO_LOW_BOUNCY);
// the bottom text about 'Have an account? sign in'
mSignInLayout = (LinearLayout) findViewById(R.id.signin_layout);
mSignInLayout.setTranslationY(500f);
final SpringAnimation signInLayoutAnimY = new SpringAnimation(mSignInLayout, SpringAnimation.TRANSLATION_Y, 0);
signInLayoutAnimY.getSpring().setStiffness(SpringForce.STIFFNESS_VERY_LOW);
signInLayoutAnimY.getSpring().setDampingRatio(SpringForce.DAMPING_RATIO_LOW_BOUNCY);
// top logo by left
mLeftLogoImg = (ImageView) findViewById(R.id.left_logo_imageview);
mLeftLogoImg.setTranslationY(400f);
mLeftLogoImg.setAlpha(0f);
final SpringAnimation leftLogoAnimY = new SpringAnimation(mLeftLogoImg, SpringAnimation.TRANSLATION_Y, 0);
leftLogoAnimY.getSpring().setStiffness(SpringForce.STIFFNESS_VERY_LOW);
leftLogoAnimY.getSpring().setDampingRatio(SpringForce.DAMPING_RATIO_LOW_BOUNCY);
leftLogoAnimY.setStartVelocity(-2000);
// top logo by right
mRightLogoImg = (ImageView) findViewById(R.id.right_logo_imageview);
mRightLogoImg.setTranslationY(400f);
mRightLogoImg.setAlpha(0f);
final SpringAnimation rightLogoAnimY = new SpringAnimation(mRightLogoImg, SpringAnimation.TRANSLATION_Y, 0);
rightLogoAnimY.getSpring().setStiffness(SpringForce.STIFFNESS_VERY_LOW);
rightLogoAnimY.getSpring().setDampingRatio(SpringForce.DAMPING_RATIO_LOW_BOUNCY);
rightLogoAnimY.setStartVelocity(-2000);
final ValueAnimator logoAlphaAnim = ObjectAnimator.ofFloat(0f, 1f);
logoAlphaAnim.setDuration(600);
logoAlphaAnim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
mLeftLogoImg.setAlpha((Float) valueAnimator.getAnimatedValue());
mRightLogoImg.setAlpha((Float) valueAnimator.getAnimatedValue());
}
});
mRightLogoImg.postDelayed(new Runnable() {
@Override
public void run() {
leftLogoAnimY.start();
mRightLogoImg.postDelayed(new Runnable() {
@Override
public void run() {
rightLogoAnimY.start();
}
}, 150);
mDescTitleTextView.postDelayed(new Runnable() {
@Override
public void run() {
descTitleAlphaAnim.setStartDelay(100);
descTitleAlphaAnim.start();
descTitleAnimY.start();
signUpBtnAnimY.start();
signInLayoutAnimY.start();
}
}, 300);
for (final SpringAnimation letterAnim : mLetterAnims) {
mLettersLayout.postDelayed(new Runnable() {
@Override
public void run() {
letterAnim.start();
}
}, 12 * mLetterAnims.indexOf(letterAnim));
}
logoAlphaAnim.start();
}
}, 1000);
}
}
