Source code
package android.support.v4.content;
import android.content.SharedPreferences.Editor;
import android.os.Build.VERSION;
import android.support.annotation.NonNull;
public class SharedPreferencesCompat {
public static class EditorCompat {
private static EditorCompat sInstance;
private final Helper mHelper;
private interface Helper {
void apply(@NonNull Editor editor);
}
private static class EditorHelperApi9Impl implements Helper {
private EditorHelperApi9Impl() {
}
public void apply(@NonNull Editor editor) {
EditorCompatGingerbread.apply(editor);
}
}
private static class EditorHelperBaseImpl implements Helper {
private EditorHelperBaseImpl() {
}
public void apply(@NonNull Editor editor) {
editor.commit();
}
}
private EditorCompat() {
if (VERSION.SDK_INT >= 9) {
this.mHelper = new EditorHelperApi9Impl();
} else {
this.mHelper = new EditorHelperBaseImpl();
}
}
public static EditorCompat getInstance() {
if (sInstance == null) {
sInstance = new EditorCompat();
}
return sInstance;
}
public void apply(@NonNull Editor editor) {
this.mHelper.apply(editor);
}
}
}