Code: Add javadoc & rename methods

Signed-off-by: Fung <[email protected]>

demo/src/main/java/moe/feng/common/stepperview/demo/fragment/VerticalStepperAdapterDemoFragment.java

@@ -2,6 +2,8 @@
 
 import android.content.Context;
 import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 import android.support.design.widget.Snackbar;
 import android.support.v4.app.Fragment;
 import android.view.LayoutInflater;
@@ -26,16 +28,16 @@ public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle saved
 	@Override
 	public void onViewCreated(View view, Bundle savedInstanceState) {
 		mVerticalStepperView = view.findViewById(R.id.vertical_stepper_view);
-		mVerticalStepperView.setViewAdapter(this);
+		mVerticalStepperView.setStepperAdapter(this);
 	}
 
 	@Override
-	public String getTitle(int index) {
+	public @NonNull String getTitle(int index) {
 		return "Step " + index;
 	}
 
 	@Override
-	public String getSummary(int index) {
+	public @Nullable String getSummary(int index) {
 		switch (index) {
 			case 0:
 				return "Summarized if needed";

library/src/main/java/moe/feng/common/stepperview/IStepperAdapter.java

@@ -1,21 +1,71 @@
 package moe.feng.common.stepperview;
 
 import android.content.Context;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 import android.view.View;
 import android.view.ViewGroup;
 
+/**
+ * Base interface providing the adapter to populate steps inside of
+ * a {@link IStepperAdapter}. You have to implement this and create your
+ * own adapter to configure steps.
+ *
+ * Or you can use a more specific implementation of this, such as
+ * {@link ViewBasedStepperAdapter}.
+ */
 public interface IStepperAdapter {
 
-	String getTitle(int index);
+	/**
+	 * This method will be called by the VerticalStepperView to obtain a title string
+	 * to describe the title of specified step. The string cannot be null.
+	 *
+	 * @param index The index of the title requested
+	 * @return A title for the requested step
+	 */
+	@NonNull String getTitle(int index);
 
-	String getSummary(int index);
+	/**
+	 * This method may be called by the VerticalStepperView to obtain a title string
+	 * to describe the summary of specified step. It may return null indicating
+	 * no summary for this step.
+	 *
+	 * @param index The index of the summary requested
+	 * @return A summary for the requested step
+	 */
+	@Nullable String getSummary(int index);
 
+	/**
+	 * Get the count of steppers
+	 *
+	 * @return The size of adapter
+	 */
 	int size();
 
+	/**
+	 * When the specified step need a custom view, this method will be called
+	 * for creating custom view. If you want to add it to ItemView by yourself,
+	 * it can return null. The returned view will be added to ItemView.
+	 *
+	 * @param index Index
+	 * @param context Context
+	 * @param parent Vertical Stepper Item View
+	 * @return The custom view created
+	 */
 	View onCreateCustomView(int index, Context context, VerticalStepperItemView parent);
 
+	/**
+	 * This method will be called when a stepper is showed.
+	 *
+	 * @param index The index of stepper showed
+	 */
 	void onShow(int index);
 
+	/**
+	 * This method will be called when a stepper is hidden.
+	 *
+	 * @param index The index of stepper hidden
+	 */
 	void onHide(int index);
 
 }

library/src/main/java/moe/feng/common/stepperview/IStepperView.java

@@ -3,14 +3,55 @@
 import android.graphics.drawable.Drawable;
 import android.support.annotation.ColorInt;
 
+/**
+ * Base interface providing a view base of stepper component.
+ * You have to implement this and create your own stepper view.
+ *
+ * We have made some stepper view:
+ * - {@link VerticalStepperView}
+ */
 interface IStepperView {
 
-	IStepperAdapter getViewAdapter();
+	/**
+	 * Get stepper adapter
+	 *
+	 * @return Stepper Adapter
+	 */
+	IStepperAdapter getStepperAdapter();
+
+	/**
+	 * Return the index of current step
+	 *
+	 * @return Index
+	 */
 	int getCurrentStep();
 
+	/**
+	 * Get normal point color
+	 *
+	 * @return Normal Point Color
+	 */
 	@ColorInt int getNormalColor();
+
+	/**
+	 * Get activated point color
+	 *
+	 * @return Activated Point Color
+	 */
 	@ColorInt int getActivatedColor();
+
+	/**
+	 * Get animation duration
+	 *
+	 * @return Animation Duration
+	 */
 	int getAnimationDuration();
+
+	/**
+	 * Get done icon drawable
+	 *
+	 * @return Done icon drawable
+	 */
 	Drawable getDoneIcon();
 
 }