在处理DocumentsUI的时候，由于是不带触屏的设备，遇到了一个问题，Toolbar按键焦点无法获取。我尝试通过改frameworks中的 一些参数，但是最终都没有解决。最后的解决办法还是自定义控件。
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/coordinator_layout">
<android.support.v4.widget.DrawerLayout
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?android:attr/actionBarSize"
android:background="?android:attr/colorPrimary"
android:elevation="8dp"
android:theme="?actionBarTheme"
android:popupTheme="?actionBarPopupTheme">
<com.android.documentsui.DropdownBreadcrumb
android:id="@+id/dropdown_breadcrumb"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="4dp"
android:popupTheme="?actionBarPopupTheme"
android:background="@android:color/transparent"
android:overlapAnchor="true" />
</Toolbar>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<include layout="@layout/directory_cluster"/>
<!-- Drawer edge is a dummy view used to capture hovering event
on view edge to open the drawer. (b/28345294) -->
<View
android:id="@+id/drawer_edge"
android:background="@android:color/transparent"
android:layout_width="@dimen/drawer_edge_width"
android:layout_height="match_parent"/>
</FrameLayout>
</LinearLayout>
<LinearLayout
android:id="@+id/drawer_roots"
android:layout_width="256dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:orientation="vertical"
android:elevation="16dp"
android:background="@color/drawer_background">
<Toolbar
android:id="@+id/roots_toolbar"
android:layout_width="match_parent"
android:layout_height="?android:attr/actionBarSize"
android:background="?android:attr/colorPrimary"
android:elevation="8dp"
android:theme="?actionBarTheme"
android:popupTheme="?actionBarPopupTheme" />
<FrameLayout
android:id="@+id/container_roots"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
</android.support.v4.widget.DrawerLayout>
</android.support.design.widget.CoordinatorLayout>
将Toolbar这个控件设置为invisible，以及 android:layout_height="0dp"。
这里没有设置为gone的原因在于如果设置为gone的话处理菜单栏的时候弹窗会在左侧显示，设置为invisible的话菜单栏的弹窗才会显示在右侧，但是由于invisible依旧占有高度所以需要把height修改为0dp。
然后在后面加一个<include layout="@layout/tool_bar" />。
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/coordinator_layout">
<android.support.v4.widget.DrawerLayout
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="?android:attr/colorPrimary"
android:elevation="8dp"
android:theme="?actionBarTheme"
android:popupTheme="?actionBarPopupTheme"
android:visibility="invisible">
<com.android.documentsui.DropdownBreadcrumb
android:id="@+id/dropdown_breadcrumb"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="4dp"
android:popupTheme="?actionBarPopupTheme"
android:background="@android:color/transparent"
android:overlapAnchor="true" />
</Toolbar>
<include layout="@layout/tool_bar" />
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<include layout="@layout/directory_cluster"/>
<!-- Drawer edge is a dummy view used to capture hovering event
on view edge to open the drawer. (b/28345294) -->
<View
android:id="@+id/drawer_edge"
android:background="@android:color/transparent"
android:layout_width="@dimen/drawer_edge_width"
android:layout_height="match_parent"/>
</FrameLayout>
</LinearLayout>
<LinearLayout
android:id="@+id/drawer_roots"
android:layout_width="256dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:orientation="vertical"
android:elevation="16dp"
android:background="@color/drawer_background">
<Toolbar
android:id="@+id/roots_toolbar"
android:layout_width="match_parent"
android:layout_height="?android:attr/actionBarSize"
android:background="?android:attr/colorPrimary"
android:elevation="8dp"
android:theme="?actionBarTheme"
android:popupTheme="?actionBarPopupTheme" />
<FrameLayout
android:id="@+id/container_roots"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
</android.support.v4.widget.DrawerLayout>
</android.support.design.widget.CoordinatorLayout>
tool_bar具体如下所示。
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="?android:attr/actionBarSize"
android:orientation="horizontal"
android:background="#303F9F"
android:gravity="center">
<ImageView
android:id="@+id/iamge_menu"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_margin="4dp"
android:focusable="true"
android:focusableInTouchMode="true"
android:src="@drawable/menu" />
<TextView
android:id="@+id/document_text_view"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="4"
android:layout_margin="4dp"
android:text="sdcard" />
<TextView
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="6"
android:layout_margin="4dp" />
<ImageView
android:id="@+id/setting_iamge_view"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_margin="4dp"
android:focusable="true"
android:focusableInTouchMode="true"
android:src="@drawable/setting" />
</LinearLayout>
menu.xml
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="24dp"
android:height="24dp"
android:viewportWidth="24.0"
android:viewportHeight="24.0">
<path
android:fillColor="#FF000000"
android:pathData="M3,18h18v-2L3,16v2zM3,13h18v-2L3,11v2zM3,6v2h18L21,6L3,6z"/>
</vector>
setting.xml
<vector xmlns:android="http://schemas.android.com/apk/res/android"
android:width="24dp"
android:height="24dp"
android:viewportWidth="24"
android:viewportHeight="24">
<path
android:fillColor="#000000"
android:pathData="M19.1,12.9a2.8,2.8 0,0 0,0.1 -0.9,2.8 2.8,0 0,0 -0.1,-0.9l2.1,-1.6a0.7,0.7 0,0 0,0.1 -0.6L19.4,5.5a0.7,0.7 0,0 0,-0.6 -0.2l-2.4,1a6.5,6.5 0,0 0,-1.6 -0.9l-0.4,-2.6a0.5,0.5 0,0 0,-0.5 -0.4H10.1a0.5,0.5 0,0 0,-0.5 0.4L9.3,5.4a5.6,5.6 0,0 0,-1.7 0.9l-2.4,-1a0.4,0.4 0,0 0,-0.5 0.2l-2,3.4c-0.1,0.2 0,0.4 0.2,0.6l2,1.6a2.8,2.8 0,0 0,-0.1 0.9,2.8 2.8,0 0,0 0.1,0.9L2.8,14.5a0.7,0.7 0,0 0,-0.1 0.6l1.9,3.4a0.7,0.7 0,0 0,0.6 0.2l2.4,-1a6.5,6.5 0,0 0,1.6 0.9l0.4,2.6a0.5,0.5 0,0 0,0.5 0.4h3.8a0.5,0.5 0,0 0,0.5 -0.4l0.3,-2.6a5.6,5.6 0,0 0,1.7 -0.9l2.4,1a0.4,0.4 0,0 0,0.5 -0.2l2,-3.4c0.1,-0.2 0,-0.4 -0.2,-0.6ZM12,15.6A3.6,3.6 0,1 1,15.6 12,3.6 3.6,0 0,1 12,15.6Z"/>
</vector>
menu和setting是通过Android studio的vector asset新建的，修改了一下fillColor。
由于FilesActivity使继承于BaseActivity，所以把这个初始化写在BaseActivity中。
//vendor\mediatek\proprietary\packages\xx\xx\src\com\android\documentsui\BaseActivity.java
public abstract class BaseActivity
extends Activity implements CommonAddons, NavigationViewManager.Environment {
...........
protected ImageView mMenuImageView;
protected ImageView mSettingImageView;
protected TextView mDocumentTextView;
...........
@CallSuper
@Override
public void onCreate(Bundle icicle) {
...........
mMenuImageView = (ImageView) findViewById(R.id.iamge_menu);
mMenuImageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
setRootsDrawerOpen(true);
focusSidebar();
}
});
mSettingImageView = (ImageView) findViewById(R.id.setting_iamge_view);
mSettingImageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
openOptionsMenu();
}
});
mDocumentTextView = (TextView) findViewById(R.id.document_text_view);
}
...........
@Override
public void onRootPicked(RootInfo root) {
mDocumentTextView.setText(root.title);
...........
}
...........
}
然后documentsui中还有一个问题就是由于文件内容的显示部分使用的是recyclerview，而由于recyclerview存在一个焦点乱飞的问题因此documentsui源码中定义了FocusManager这个类，FocusManager中有一个ContentScope，限定了按键移动时焦点只能在recyclerview中移动。
public final class FocusManager implements FocusHandler {
...........
@Override
public boolean handleKey(DocumentHolder doc, int keyCode, KeyEvent event) {
// Search helper gets first crack, for doing type-to-focus.
if (mSearchHelper.handleKey(doc, keyCode, event)) {
return true;
}
if (Events.isNavigationKeyCode(keyCode)) {
// Find the target item and focus it.
int endPos = findTargetPosition(doc.itemView, keyCode, event);
if (endPos != RecyclerView.NO_POSITION) {
focusItem(endPos);
}
// Swallow all navigation keystrokes. Otherwise they go to the app's global
// key-handler, which will route them back to the DF and cause focus to be reset.
return true;
}
return false;
}
...........
}
RecyclerView.NO_POSITION是recyclerview的顶部，当按键移动到recyclerview的顶部的时候，return true，消费了事件，因此不会再处理事件，按键无法移动到recyclerview之外的地方，所以需要修改使endPos = RecyclerView.NO_POSITION的时候返回false，把return true移动到判断条件if (endPos != RecyclerView.NO_POSITION)内即可。
修后改如下
public final class FocusManager implements FocusHandler {
...........
@Override
public boolean handleKey(DocumentHolder doc, int keyCode, KeyEvent event) {
// Search helper gets first crack, for doing type-to-focus.
if (mSearchHelper.handleKey(doc, keyCode, event)) {
return true;
}
if (Events.isNavigationKeyCode(keyCode)) {
// Find the target item and focus it.
int endPos = findTargetPosition(doc.itemView, keyCode, event);
if (endPos != RecyclerView.NO_POSITION) {
focusItem(endPos);
return true;
}
// Swallow all navigation keystrokes. Otherwise they go to the app's global
// key-handler, which will route them back to the DF and cause focus to be reset.
}
return false;
}
...........
}
还有 一点，由于FilesActivity中使用的SharedInputHandler实际上定义了当移动按键事件时，直接调用了focusDirectoryList，所以会按键会直接定位到recyclerview中。
//vendor\mediatek\proprietary\packages\xx\xx\src\com\android\documentsui\SharedInputHandler.java
public class SharedInputHandler {
...........
public boolean onKeyDown(int keyCode, KeyEvent event) {
switch (keyCode) {
// Unhandled ESC keys end up being rethrown back at us as BACK keys. So by returning
// true, we make sure it always does no-op.
case KeyEvent.KEYCODE_ESCAPE:
return onEscape();
case KeyEvent.KEYCODE_DEL:
return onDelete();
// This is the Android back button, not backspace.
case KeyEvent.KEYCODE_BACK:
return onBack();
case KeyEvent.KEYCODE_TAB:
return onTab();
default:
// Instead of duplicating the switch-case in #isNavigationKeyCode, best just to
// leave it here.
if (Events.isNavigationKeyCode(keyCode)) {
// Forward all unclaimed navigation keystrokes to the directory list.
// This causes any stray navigation keystrokes to focus the content pane,
// which is probably what the user is trying to do.
mFocusManager.focusDirectoryList();
return true;
}
return false;
}
}
...........
}
由于正常情况下，按键移动不处理事件返回的是false，因此把这一部分屏蔽掉即可。
public boolean onKeyDown(int keyCode, KeyEvent event) {
switch (keyCode) {
// Unhandled ESC keys end up being rethrown back at us as BACK keys. So by returning
// true, we make sure it always does no-op.
case KeyEvent.KEYCODE_ESCAPE:
return onEscape();
case KeyEvent.KEYCODE_DEL:
return onDelete();
// This is the Android back button, not backspace.
case KeyEvent.KEYCODE_BACK:
return onBack();
case KeyEvent.KEYCODE_TAB:
return onTab();
default:
// Instead of duplicating the switch-case in #isNavigationKeyCode, best just to
// leave it here.
/*if (Events.isNavigationKeyCode(keyCode)) {
// Forward all unclaimed navigation keystrokes to the directory list.
// This causes any stray navigation keystrokes to focus the content pane,
// which is probably what the user is trying to do.
mFocusManager.focusDirectoryList();
return true;
}*/
return false;
}
}
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