Animer vue à glisser sur un autre point de vue, en poussant des vues au-dessous de la route

Je crois que l'approche la plus simple est d'étendre Animation classe et substituer applyTransformation() pour changer la vue de la hauteur comme suit:

import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.view.animation.Animation;
import android.view.animation.Transformation;
import android.widget.LinearLayout;
public class MyCustomAnimation extends Animation {
public final static int COLLAPSE = 1;
public final static int EXPAND = 0;
private View mView;
private int mEndHeight;
private int mType;
private LinearLayout.LayoutParams mLayoutParams;
public MyCustomAnimation(View view, int duration, int type) {
setDuration(duration);
mView = view;
mEndHeight = mView.getHeight();
mLayoutParams = ((LinearLayout.LayoutParams) view.getLayoutParams());
mType = type;
if(mType == EXPAND) {
mLayoutParams.height = 0;
} else {
mLayoutParams.height = LayoutParams.WRAP_CONTENT;
}
view.setVisibility(View.VISIBLE);
}
public int getHeight(){
return mView.getHeight();
}
public void setHeight(int height){
mEndHeight = height;
}
@Override
protected void applyTransformation(float interpolatedTime, Transformation t) {
super.applyTransformation(interpolatedTime, t);
if (interpolatedTime < 1.0f) {
if(mType == EXPAND) {
mLayoutParams.height =  (int)(mEndHeight * interpolatedTime);
} else {
mLayoutParams.height = (int) (mEndHeight * (1 - interpolatedTime));
}
mView.requestLayout();
} else {
if(mType == EXPAND) {
mLayoutParams.height = LayoutParams.WRAP_CONTENT;
mView.requestLayout();
}else{
mView.setVisibility(View.GONE);
}
}
}
}

À utiliser, il suffit de mettre votre onclick() comme suit:

int height;
@Override
public void onClick(View v) {
if(view2.getVisibility() == View.VISIBLE){
MyCustomAnimation a = new MyCustomAnimation(view2, 1000, MyCustomAnimation.COLLAPSE);
height = a.getHeight();
view2.startAnimation(a);
}else{
MyCustomAnimation a = new MyCustomAnimation(view2, 1000, MyCustomAnimation.EXPAND);
a.setHeight(height);
view2.startAnimation(a);
}
}

Ce qui concerne.

Ici est simple exemple de la main-d'animation, qui fournissent ce que vous voulez. Il travaille en application de test, mais je ne suis pas sûr qu'il n'y a pas de bugs:

public class MainActivity extends Activity implements OnClickListener {
private Timer timer;
private TimerTask animationTask;
private View view1;
private View view2;
boolean animating;
boolean increasing = true;
int initHeight = -1;
private LayoutParams params;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
timer = new Timer();
view1 = findViewById(R.id.view1);//clickable view
view1.setOnClickListener(this); 
view2 = findViewById(R.id.view2);//animated view
params = view2.getLayoutParams();
}
@Override
protected void onDestroy() {
super.onDestroy();
timer.cancel();
}
@Override
public void onClick(View v) {
Toast.makeText(this, "start animating...", Toast.LENGTH_SHORT).show();
animationTask = new TimerTask() {
@Override
public void run() {
runOnUiThread(new Runnable() {
@Override
public void run() {
if (animationFinished()) {
animating = false;
cancel();//canceling animating task
return;
}
params.height += increasing ? 1 : -1;
view2.setLayoutParams(params);
}
});
}
private boolean animationFinished() {
int viewHeight = view2.getHeight();
if (increasing && viewHeight >= initHeight) {
return true;
}
if (!increasing && viewHeight <= 0) {
return true;
}
return false;
}
};
//if we already animating - we just change direction of animation
increasing = !increasing;
if (!animating) {
animating = true;
int height = view2.getHeight();
params.height = height;
view2.setLayoutParams(params);//change param "height" from "wrap_conent" to real height
if (initHeight < 0) {//height of view - we setup it only once
initHeight = height;
}
timer.schedule(animationTask, 0, 10);//changing repeat time here will fasten or slow down animation
}
}
}

Je le ferais comme ça. D'abord la mise en page de l'ensemble du panneau réductible composant: (pseudo xml)

RelativeLayout (id=panel, clip)
LinearLayout (id=content, alignParentBottom=true)
LinearLayout (id=handle, above=content)

Ce qui devrait garantir que le contenu est toujours en dessous de la poignée.

Puis, quand vous avez besoin de l'effondrement:

• Animer la marge supérieure de contenu de 0 à-de contenu.hauteur
• Animer la hauteur du panneau de courant de courant de contenu.hauteur

Simplement passer android:animateLayoutChanges à LinearLayout qui détient tous les points de vue, vous permettra d'atteindre le résultat souhaité.