@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
// Skip this work if a transition is running; it sets the scroll values independently
// and should not have those animated values clobbered by this logic
LayoutTransition transition = mLinearLayout.getLayoutTransition();
if (transition != null && transition.isRunning()) {
return;
}
// Keep track of the last visible item in the list so we can restore it
// to the bottom when the orientation changes.
mLastScrollPosition = scrollPositionOfMostRecent();
// This has to happen post-layout, so run it "in the future"
post(
new Runnable() {
public void run() {
// Make sure we're still not clobbering the transition-set values, since this
// runnable launches asynchronously
LayoutTransition transition = mLinearLayout.getLayoutTransition();
if (transition == null || !transition.isRunning()) {
scrollTo(mLastScrollPosition, 0);
}
}
});
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_layout_animation);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
rootContainer = (LinearLayout) findViewById(R.id.root_container);
// rootContainer.setOnClickListener(new View.OnClickListener() {
// @Override
// public void onClick(View v) {
// String text = "test view " + (index ++);
// TextView textView = new TextView(LayoutAnimationActivity.this);
// textView.setId(View.generateViewId());
// textView.setText(text);
// LinearLayout.LayoutParams layoutParams = new
// LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,
// ViewGroup.LayoutParams.WRAP_CONTENT);
// layoutParams.setMargins(10, 10, 10, 10);
// rootContainer.addView(textView);
// lastView = textView;
// }
// });
fab.setOnClickListener(
new View.OnClickListener() {
@Override
public void onClick(View view) {
String text = "test view " + (index++);
TextView textView = new TextView(LayoutAnimationActivity.this);
textView.setId(View.generateViewId());
textView.setText(text);
textView.setAlpha(0f);
LinearLayout.LayoutParams layoutParams =
new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(10, 10, 10, 10);
rootContainer.addView(textView);
lastView = textView;
}
});
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
rootContainer.getLayoutTransition().setAnimateParentHierarchy(false);
ObjectAnimator appearingAnimator1 = new ObjectAnimator();
appearingAnimator1.setPropertyName("x");
appearingAnimator1.setFloatValues(rootContainer.getPaddingLeft(), 200);
appearingAnimator1.setDuration(1000);
ObjectAnimator appearingAnimator2 = new ObjectAnimator();
appearingAnimator2.setPropertyName("x");
appearingAnimator2.setFloatValues(200, rootContainer.getPaddingLeft());
appearingAnimator2.setDuration(1000);
ObjectAnimator appearingAnimator3 = new ObjectAnimator();
appearingAnimator3.setPropertyName("alpha");
appearingAnimator3.setFloatValues(0f, 1f);
appearingAnimator3.setDuration(4000);
AnimatorSet set = new AnimatorSet();
set.playTogether(appearingAnimator1, appearingAnimator3);
set.play(appearingAnimator2).after(appearingAnimator1);
rootContainer.getLayoutTransition().setAnimator(LayoutTransition.APPEARING, set);
}
