ADD week 5

02-Easy5/E5/sources/androidx/viewpager/widget/PagerAdapter.java

@@ -0,0 +1,104 @@
+package androidx.viewpager.widget;
+
+import android.database.DataSetObservable;
+import android.database.DataSetObserver;
+import android.os.Parcelable;
+import android.view.View;
+import android.view.ViewGroup;
+
+/* loaded from: classes.dex */
+public abstract class PagerAdapter {
+    public static final int POSITION_NONE = -2;
+    public static final int POSITION_UNCHANGED = -1;
+    private final DataSetObservable mObservable = new DataSetObservable();
+    private DataSetObserver mViewPagerObserver;
+
+    @Deprecated
+    public void finishUpdate(View view) {
+    }
+
+    public abstract int getCount();
+
+    public int getItemPosition(Object obj) {
+        return -1;
+    }
+
+    public CharSequence getPageTitle(int i) {
+        return null;
+    }
+
+    public float getPageWidth(int i) {
+        return 1.0f;
+    }
+
+    public abstract boolean isViewFromObject(View view, Object obj);
+
+    public void restoreState(Parcelable parcelable, ClassLoader classLoader) {
+    }
+
+    public Parcelable saveState() {
+        return null;
+    }
+
+    @Deprecated
+    public void setPrimaryItem(View view, int i, Object obj) {
+    }
+
+    @Deprecated
+    public void startUpdate(View view) {
+    }
+
+    public void startUpdate(ViewGroup viewGroup) {
+        startUpdate((View) viewGroup);
+    }
+
+    public Object instantiateItem(ViewGroup viewGroup, int i) {
+        return instantiateItem((View) viewGroup, i);
+    }
+
+    public void destroyItem(ViewGroup viewGroup, int i, Object obj) {
+        destroyItem((View) viewGroup, i, obj);
+    }
+
+    public void setPrimaryItem(ViewGroup viewGroup, int i, Object obj) {
+        setPrimaryItem((View) viewGroup, i, obj);
+    }
+
+    public void finishUpdate(ViewGroup viewGroup) {
+        finishUpdate((View) viewGroup);
+    }
+
+    @Deprecated
+    public Object instantiateItem(View view, int i) {
+        throw new UnsupportedOperationException("Required method instantiateItem was not overridden");
+    }
+
+    @Deprecated
+    public void destroyItem(View view, int i, Object obj) {
+        throw new UnsupportedOperationException("Required method destroyItem was not overridden");
+    }
+
+    public void notifyDataSetChanged() {
+        synchronized (this) {
+            DataSetObserver dataSetObserver = this.mViewPagerObserver;
+            if (dataSetObserver != null) {
+                dataSetObserver.onChanged();
+            }
+        }
+        this.mObservable.notifyChanged();
+    }
+
+    public void registerDataSetObserver(DataSetObserver dataSetObserver) {
+        this.mObservable.registerObserver(dataSetObserver);
+    }
+
+    public void unregisterDataSetObserver(DataSetObserver dataSetObserver) {
+        this.mObservable.unregisterObserver(dataSetObserver);
+    }
+
+    void setViewPagerObserver(DataSetObserver dataSetObserver) {
+        synchronized (this) {
+            this.mViewPagerObserver = dataSetObserver;
+        }
+    }
+}