【发布时间】：2017-03-24 02:56:58
【问题描述】：
我创建了一个带有右侧抽屉的 DrawerLayout。到目前为止，一切都很好。现在，有一个菜单项，单击它会打开一个带有 5 个不同选项的弹出菜单（见屏幕截图）。当单击其中一个选项时，主菜单中的图标应该换成我刚刚单击的图标，然后主菜单应该关闭。但是，我无法创建这种行为。目前，当我尝试单击弹出菜单中的选项之一时，会发生以下情况： 1. 主菜单（抽屉）关闭。 2. 只有当我点击所需的选项再次时，主菜单中的图标才会被交换。 据我了解，这是 DrawerView 中抽屉的默认行为，一旦我单击屏幕中的某个位置，它就会关闭。我试图通过设置锁定模式来解决它：
myDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_OPEN, Gravity.END)
...但没有运气。只要我尝试单击弹出窗口中的一项，抽屉就会关闭。 甚至可以在 DrawerLayout 中实现我想要的吗？
这是我的代码：
activity_main.xml
<android.support.v4.widget.DrawerLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="net.videosc2.activities.VideOSCMainActivity">
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/camera_preview"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<ImageView
android:id="@+id/camera_downscaled"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:antialias="false"
android:contentDescription="@string/preview_image_content_description"
android:scaleType="fitXY"/>
</FrameLayout>
<!-- The navigation drawer that comes from the right (layout_gravity:end) -->
<ListView
android:id="@+id/drawer"
android:layout_width="50dp"
android:layout_height="match_parent"
android:layout_gravity="center_vertical|end"
android:background="#99000000"
android:choiceMode="singleChoice"
android:divider="@android:color/transparent"
android:dividerHeight="10dp"
app:itemTextColor="@android:color/white"/>
</android.support.v4.widget.DrawerLayout>
drawer_item.xml
<?xml version="1.0" encoding="utf-8"?>
<ImageView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/tool"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?android:attr/activatedBackgroundIndicator"
android:contentDescription="@string/a_tools_menu_item"
android:gravity="center_vertical"
android:paddingBottom="8dp"
android:paddingLeft="8dp"
android:paddingRight="8dp"
android:paddingTop="8dp"/>
color_mode_panel.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/color_mode_panel"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end"
android:layout_marginEnd="60dp"
android:layout_marginRight="60dp"
android:layout_marginTop="100dp"
android:background="#99000000"
android:clickable="true"
android:orientation="horizontal">
<ImageButton
android:id="@+id/mode_rgb"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#00000000"
android:contentDescription="@string/color_mode_rgb"
android:padding="8dp"
android:src="@drawable/rgb"/>
<ImageButton
android:id="@+id/mode_rgb_inv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#00000000"
android:clickable="true"
android:contentDescription="@string/color_mode_rgb_neg"
android:padding="8dp"
android:src="@drawable/rgb_inv"/>
<ImageButton
android:id="@+id/mode_r"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#00000000"
android:contentDescription="@string/color_mode_r"
android:padding="8dp"
android:src="@drawable/r"/>
<ImageButton
android:id="@+id/mode_g"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#00000000"
android:contentDescription="@string/color_mode_g"
android:padding="8dp"
android:src="@drawable/g"/>
<ImageButton
android:id="@+id/mode_b"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#00000000"
android:contentDescription="@string/color_mode_b"
android:padding="8dp"
android:src="@drawable/b"/>
</LinearLayout>
MainActivity.java
public class MainActivity extends AppCompatActivity {
static final String TAG = "MainActivity";
View camView;
public static Point dimensions;
private DrawerLayout toolsDrawerLayout;
private FrameLayout mainFrame;
private ActionBarDrawerToggle drawerToggle;
protected ArrayList<View> uiElements = new ArrayList<>();
// is device currently sending OSC?
public boolean isPlaying = false;
// is flashlight on?
public boolean isTorchOn = false;
// don't create more than one color mode panel
private boolean isColorModePanelOpen = false;
public Fragment cameraPreview;
Camera camera;
/**
* Fragment managing the behaviors, interactions and presentation of the navigation drawer.
*/
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_main);
final FragmentManager fragmentManager = getFragmentManager();
if (findViewById(R.id.camera_preview) != null) {
camView = findViewById(R.id.camera_preview);
if (savedInstanceState != null) return;
cameraPreview = new VideOSCCameraFragment();
fragmentManager.beginTransaction()
.replace(R.id.camera_preview, cameraPreview, "CamPreview")
.commit();
}
TypedArray tools = getResources().obtainTypedArray(drawer_icons_id);
toolsDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
toolsDrawerLayout.setScrimColor(Color.TRANSPARENT);
// FIXME: touches seem to get swallowed by the DrawerLayout first
final ListView toolsDrawerList = (ListView) findViewById(R.id.drawer);
List<BitmapDrawable> toolsList = new ArrayList<>();
for (int i = 0; i < tools.length(); i++) {
toolsList.add((BitmapDrawable) tools.getDrawable(i));
}
// set the drawer menu in a custom Adapter
toolsDrawerList.setAdapter(new ToolsMenuAdapter(this, R.layout.drawer_item, R.id.tool, toolsList));
tools.recycle();
toolsDrawerList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
BitmapDrawable img;
final ImageView imgView = (ImageView) view.findViewById(R.id.tool);
Context context = getApplicationContext();
// we can not use 'cameraPreview' to retrieve the 'mCamera' object
VideOSCCameraFragment camPreview = (VideOSCCameraFragment) fragmentManager.findFragmentByTag("CamPreview");
camera = camPreview.mCamera;
LayoutInflater inflater = getLayoutInflater();
switch (i) {
// ... other cases...
case 2:
if (!isColorModePanelOpen) {
int y = (int) view.getY();
// create pop-out
final View modePanel = inflater.inflate(R.layout.color_mode_panel, (FrameLayout) camView, true);
isColorModePanelOpen = true;
// try to lock the main menu drawer - didn't work for me
toolsDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_LOCKED_OPEN, toolsDrawerList);
final View modePanelInner = modePanel.findViewById(R.id.color_mode_panel);
// set the vertical position of the pop-out
ActivityHelpers.setMargins(modePanelInner, 0, y, 0, 0);
// set actions for each item in the pop-out
for (int k = 0; k < ((ViewGroup) modePanelInner).getChildCount(); k++) {
final Context iContext = context;
View button = ((ViewGroup) modePanelInner).getChildAt(k);
button.setOnClickListener(new View.OnClickListener() {
@Override
// FIXME: touches seem to get swallowed by the DrawerLayout first
public void onClick(View view) {
switch (view.getId()) {
case R.id.mode_rgb:
Log.d(TAG, "rgb");
imgView.setImageDrawable(ContextCompat.getDrawable(iContext, R.drawable.rgb));
break;
case R.id.mode_rgb_inv:
Log.d(TAG, "rgb inverted");
imgView.setImageDrawable(ContextCompat.getDrawable(iContext, R.drawable.rgb_inv));
break;
case R.id.mode_r:
Log.d(TAG, "red");
imgView.setImageDrawable(ContextCompat.getDrawable(iContext, R.drawable.r));
break;
case R.id.mode_g:
Log.d(TAG, "green");
imgView.setImageDrawable(ContextCompat.getDrawable(iContext, R.drawable.g));
break;
case R.id.mode_b:
Log.d(TAG, "blue");
imgView.setImageDrawable(ContextCompat.getDrawable(iContext, R.drawable.b));
break;
default:
imgView.setImageDrawable(ContextCompat.getDrawable(iContext, R.drawable.rgb));
}
// remove the pop-out
((ViewGroup) modePanelInner.getParent()).removeView(modePanelInner);
isColorModePanelOpen = false;
// unlock the drawer again
toolsDrawerLayout.setDrawerLockMode(DrawerLayout.LOCK_MODE_UNLOCKED, Gravity.END);
// now the drawer should finally get closed
toolsDrawerLayout.closeDrawer(Gravity.END);
}
});
}
}
break;
// ... other cases ...
}
});
// open drawer on application start
toolsDrawerLayout.openDrawer(Gravity.END);
}
}
}
编辑：
我发现 this post 为我提供了一种简单的方法来防止弹出窗口被关闭，方法是在我的 MainActivity.java 中添加以下内容：
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
// We only want to intercept MotionEvent.ACTION_UP if the pop-out is present
return !(isColorModePanelOpen && event.getAction() == MotionEvent.ACTION_UP) && super.dispatchTouchEvent(event);
}
在尝试单击弹出窗口中的按钮之一时抽屉没有立即关闭的情况下有效。不幸的是，这些按钮也不接受点击（分别使用事件动作 MotionEvent.ACTION_DOWN 进行触摸）。看来，只要抽屉没有再次关闭，整个屏幕就会被阻止任何用户交互。
谁能证实我的怀疑？ （或证明我错了）
谢谢
【问题讨论】：
标签： android drawerlayout