我有一个带有Recyclerview的屏幕和LinearLayout中的其他元素.问题是当我删除RecyclerView的一个项目时,animateLayoutChanges在这种情况下不起作用. anayone知道为什么会这样吗？
XML
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.alvaro.resizetest.MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:animateLayoutChanges="true"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
<LinearLayout
android:id="@+id/test1"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="@color/colorAccent"
android:gravity="center_vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="LinearLayout"
android:textColor="#FFFFFF"
android:textSize="22sp"/>
</LinearLayout>
<LinearLayout
android:id="@+id/test2"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="@color/colorPrimaryDark"
android:gravity="center_vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="LinearLayout"
android:textColor="#FFFFFF"
android:textSize="22sp"/>
</LinearLayout>
<LinearLayout
android:id="@+id/test3"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="@color/colorAccent"
android:gravity="center_vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="LinearLayout"
android:textColor="#FFFFFF"
android:textSize="22sp"/>
</LinearLayout>
<LinearLayout
android:id="@+id/test4"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="@color/colorPrimaryDark"
android:gravity="center_vertical">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="LinearLayout"
android:textColor="#FFFFFF"
android:textSize="22sp"/>
</LinearLayout>
</LinearLayout>
JAVA
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
Adapter adapter = new Adapter();
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);
recyclerView.setNestedScrollingEnabled(true);
View.OnClickListener listener = new View.OnClickListener() {
@Override
public void onClick(View view) {
view.setVisibility(View.GONE);
}
};
findViewById(R.id.test1).setOnClickListener(listener);
findViewById(R.id.test2).setOnClickListener(listener);
findViewById(R.id.test3).setOnClickListener(listener);
findViewById(R.id.test4).setOnClickListener(listener);
}
class Adapter extends RecyclerView.Adapter<Adapter.Holder>{
int size = 3;
public Adapter() {
}
@Override
public Holder onCreateViewHolder(ViewGroup parent,int viewType) {
View view = getLayoutInflater().inflate(R.layout.item,parent,false);
return new Holder(view);
}
@Override
public void onBindViewHolder(Holder holder,int position) {
}
@Override
public int getItemCount() {
return size;
}
class Holder extends RecyclerView.ViewHolder {
public Holder(final View itemView) {
super(itemView);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
size --;
notifyItemRemoved(getAdapterPosition());
}
});
}
}
}
解决方法
过了一会儿我得到了解决方案.我创建了一个函数来设置recyclelerView高度的动画.
JAVA
public class MainActivity extends AppCompatActivity {
private final String TAG = MainActivity.class.getSimpleName();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
Adapter adapter = new Adapter(recyclerView);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this) {
@Override
public boolean canScrollVertically() {
return false;
}
};
recyclerView.setLayoutManager(linearLayoutManager);
recyclerView.setAdapter(adapter);
recyclerView.setNestedScrollingEnabled(true);
View.OnClickListener listener = new View.OnClickListener() {
@Override
public void onClick(View view) {
view.setVisibility(View.GONE);
}
};
findViewById(R.id.test1).setOnClickListener(listener);
findViewById(R.id.test2).setOnClickListener(listener);
findViewById(R.id.test3).setOnClickListener(listener);
findViewById(R.id.test4).setOnClickListener(listener);
}
public void animateHeight(final View v,final int height) {
final int initialHeight = v.getMeasuredHeight();
int duration = 500;
Interpolator interpolator = new AccelerateInterpolator(2);
// I have to set the same height before the animation because there is a glitch
// in the beginning of the animation
v.getLayoutParams().height = initialHeight;
v.requestLayout();
Animation a = new Animation() {
@Override
protected void applyTransformation(float interpolatedTime,Transformation t) {
Log.d(TAG,"InterpolatedTime: " + interpolatedTime);
Log.d(TAG,"Collapsing height: " + (initialHeight - (int) (height * interpolatedTime)));
v.getLayoutParams().height = initialHeight - (int) (height * interpolatedTime);
v.requestLayout();
}
@Override
public boolean willChangeBounds() {
return true;
}
};
a.setDuration(duration);
a.setInterpolator(interpolator);
v.startAnimation(a);
}
class Adapter extends RecyclerView.Adapter<Adapter.Holder> {
RecyclerView mRecyclerView;
int size = 3;
public Adapter(RecyclerView recyclerView) {
mRecyclerView = recyclerView;
}
@Override
public Holder onCreateViewHolder(ViewGroup parent,int position) {
}
@Override
public int getItemCount() {
return size;
}
class Holder extends RecyclerView.ViewHolder {
public Holder(final View itemView) {
super(itemView);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
size--;
notifyItemRemoved(getAdapterPosition());
animateHeight((View) itemView.getParent(),itemView.getMeasuredHeight());
}
});
}
}
}
}
