Update

app/src/main/java/com/hippo/widget/Appbar.java

@@ -0,0 +1,80 @@
+/*
+ * Copyright (C) 2015 Hippo Seven
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.hippo.widget;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.os.Build;
+import android.util.AttributeSet;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.widget.FrameLayout;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import com.hippo.ehviewer.R;
+import com.hippo.util.ViewUtils;
+
+public class Appbar extends FrameLayout {
+
+    private Context mContext;
+
+    private ImageView mNavigationIcon;
+    private TextView mTitle;
+
+    private String mTitleString;
+
+    public Appbar(Context context) {
+        super(context);
+        init(context);
+    }
+
+    public Appbar(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init(context);
+    }
+
+    public Appbar(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        init(context);
+    }
+
+    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
+    public Appbar(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+        init(context);
+    }
+
+    private void init(Context context) {
+        mContext = context;
+
+        LayoutInflater.from(context).inflate(R.layout.widget_app_bar, this);
+
+        mNavigationIcon = (ImageView) findViewById(R.id.ab_navigation_icon);
+        mTitle = (TextView) findViewById(R.id.ab_title);
+
+        ViewUtils.setVisibility(mNavigationIcon, View.GONE);
+    }
+
+    public void setTitle(int resId) {
+        setTitle(mContext.getString(resId));
+    }
+
+    public void setTitle(String title) {
+        mTitleString = title;
+        mTitle.setText(title);
+    }
+}

app/src/main/java/com/hippo/widget/DrawerFrameLayout.java

@@ -18,16 +18,21 @@ package com.hippo.widget;
 import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.res.TypedArray;
+import android.graphics.Rect;
 import android.os.Build;
 import android.util.AttributeSet;
 import android.widget.FrameLayout;
 
+import org.jetbrains.annotations.NotNull;
+
 public class DrawerFrameLayout extends FrameLayout {
 
     private static final int[] MAX_ATTRS = {android.R.attr.maxWidth};
 
     private int mMaxWidth = -1;
 
+    private OnGetPaddingListener mOnGetPaddingListener;
+
     public DrawerFrameLayout(Context context, AttributeSet attrs) {
         super(context, attrs);
         init(context, attrs, 0, 0);
@@ -50,6 +55,7 @@ public class DrawerFrameLayout extends FrameLayout {
         a.recycle();
     }
 
+
     @Override
     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
         int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);
@@ -62,4 +68,25 @@ public class DrawerFrameLayout extends FrameLayout {
 
         super.onMeasure(widthMeasureSpec, heightMeasureSpec);
     }
+
+    @SuppressWarnings("deprecation")
+    @Override
+    protected boolean fitSystemWindows(@NotNull Rect insets) {
+        if (mOnGetPaddingListener != null) {
+            mOnGetPaddingListener.onGetPadding(insets.left, insets.top,
+                    insets.right, insets.bottom);
+        }
+
+        insets.set(0, 0, 0, 0);
+
+        return super.fitSystemWindows(insets);
+    }
+
+    public void setOnGetPaddingListener(OnGetPaddingListener listener) {
+        mOnGetPaddingListener = listener;
+    }
+
+    public interface OnGetPaddingListener {
+        public void onGetPadding(int l, int t, int r, int b);
+    }
 }

app/src/main/java/com/hippo/widget/PrefixEditText.java

@@ -16,6 +16,8 @@
 package com.hippo.widget;
 
 import android.content.Context;
+import android.os.Bundle;
+import android.os.Parcelable;
 import android.text.Editable;
 import android.text.Selection;
 import android.text.TextWatcher;
@@ -25,6 +27,9 @@ import android.widget.AutoCompleteTextView;
 public class PrefixEditText extends AutoCompleteTextView
         implements TextWatcher {
 
+    private static final String STATE_KEY_SUPER = "super";
+    private static final String STATE_KEY_PREFIX = "prefix";
+
     private Context mContext;
     private String mPrefix;
 
@@ -95,4 +100,21 @@ public class PrefixEditText extends AutoCompleteTextView
         }
     }
 
+    @Override
+    public Parcelable onSaveInstanceState() {
+        final Bundle state = new Bundle();
+        state.putParcelable(STATE_KEY_SUPER, super.onSaveInstanceState());
+        state.putString(STATE_KEY_PREFIX, mPrefix);
+        return state;
+    }
+
+    @Override
+    public void onRestoreInstanceState(Parcelable state) {
+        if (state instanceof Bundle) {
+            final Bundle savedState = (Bundle) state;
+            super.onRestoreInstanceState(savedState.getParcelable(STATE_KEY_SUPER));
+            setPrefix(savedState.getString(STATE_KEY_PREFIX));
+        }
+    }
+
 }