我正在使用 android studio 3.1，我想更改抽屉以便从右侧显示。我试过android:layout_gravity="end"了，从 rtl 滑动时效果很好，但是当我单击左侧的菜单按钮时，我仍然遇到一个问题，应用程序停止
我想我必须把它改到右边，但我不知道怎么做
MainActivity.java ：
public class MainActivity extends AppCompatActivity {
private final String TAG = MainActivity.class.getSimpleName();
private static final int PLAY_SERVICES_RESOLUTION_REQUEST = 9000;
//Defining Variables
private Toolbar toolbar;
private NavigationView navigationView;
private DrawerLayout drawerLayout;
private int previousDrawerItemChecked;
private SearchView searchView;
private BroadcastReceiver mRegistrationBroadcastReceiver;
//private ProgressBar mRegistrationProgressBar;
//private TextView mInformationTextView;
private boolean isReceiverRegistered;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initializing Toolbar and setting it as the actionbar
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//Initializing NavigationView
navigationView = (NavigationView) findViewById(R.id.navigation_view);
//Setting Navigation View Item Selected Listener to handle the item click of the navigation menu
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
// This method will trigger on item Click of navigation menu
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
//Checking if the item is in checked state or not, if not make it in checked state
if(menuItem.isChecked()) menuItem.setChecked(false);
else menuItem.setChecked(true);
//Closing drawer on item click
drawerLayout.closeDrawers();
//Check to see which item was being clicked and perform appropriate action
switch (menuItem.getItemId()){
//Replacing the main content with ContentFragment Which is our Inbox View;
case R.id.recently_added:
sub_recently_added();
previousDrawerItemChecked = 0;
return true;
case R.id.categories:
sub_labels_results();
previousDrawerItemChecked = 1;
return true;
case R.id.popular:
sub_label_results(Const.BLOGGER_FEATURED_CATEGORY);
previousDrawerItemChecked = 2;
return true;
case R.id.about:
sub_about_fragment();
previousDrawerItemChecked = 3;
return true;
case R.id.rate_app:
Uri uri = Uri.parse("market://details?id=" + getApplicationContext().getPackageName());
Intent goToMarket = new Intent(Intent.ACTION_VIEW, uri);
// To count with Play market backstack, After pressing back button,
// to taken back to our application, we need to add following flags to intent.
goToMarket.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY |
Intent.FLAG_ACTIVITY_NEW_DOCUMENT |
Intent.FLAG_ACTIVITY_MULTIPLE_TASK);
try {
startActivity(goToMarket);
} catch (ActivityNotFoundException e) {
startActivity(new Intent(Intent.ACTION_VIEW,
Uri.parse("http://play.google.com/store/apps/details?id=" + getApplicationContext().getPackageName())));
}
return true;
default:
Toast.makeText(getApplicationContext(),"Somethings Wrong",Toast.LENGTH_SHORT).show();
return true;
}
}
});
// Initializing Drawer Layout and ActionBarToggle
drawerLayout = (DrawerLayout) findViewById(R.id.drawer);
ActionBarDrawerToggle actionBarDrawerToggle = new ActionBarDrawerToggle(this,drawerLayout,toolbar,R.string.openDrawer, R.string.closeDrawer){
@Override
public void onDrawerClosed(View drawerView) {
// Code here will be triggered once the drawer closes as we dont want anything to happen so we leave this blank
super.onDrawerClosed(drawerView);
}
@Override
public void onDrawerOpened(View drawerView) {
// Code here will be triggered once the drawer open as we dont want anything to happen so we leave this blank
super.onDrawerOpened(drawerView);
}
};
//Setting the actionbarToggle to drawer layout
drawerLayout.setDrawerListener(actionBarDrawerToggle);
//calling sync state is necessay or else your hamburger icon wont show up
actionBarDrawerToggle.syncState();
if (savedInstanceState == null) {
sub_recently_added();
previousDrawerItemChecked = 0;
}
if (AppController.getInstance().getPrefManger().getFirstLaunched()){
//Sending Broadcast to LabelsController
Intent intent = new Intent();
intent.setAction(Const.PACKAGE_INTENT);
sendBroadcast(intent);
AppController.getInstance().getPrefManger().setFirstLaunched(false);
}
}
@Override
public boolean onCreateOptionsMenu(final Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
// Associate searchable configuration with the SearchView
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
searchView.setQueryHint(getString(R.string.search_hint));
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextChange(String newText) {
return false;
}
@Override
public boolean onQueryTextSubmit(String query) {
toolbar.setSubtitle("Search Results for: " + query);
searchView.onActionViewCollapsed();
searchView.setQuery("", false);
searchView.clearFocus();
//menu.findItem(R.id.action_search).collapseActionView();
sub_search_results(query);
return true;
}
});
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
return super.onOptionsItemSelected(item);
}
@Override
public void onBackPressed(){
FragmentManager fm = getSupportFragmentManager();
if (fm.getBackStackEntryCount()>0){
String title = fm.getBackStackEntryAt(fm.getBackStackEntryCount()-1).getName();
fm.addOnBackStackChangedListener(new FragmentManager.OnBackStackChangedListener() {
@Override
public void onBackStackChanged() {
FragmentManager manager = getSupportFragmentManager();
if (manager != null) {
int backStackEntryCount = manager.getBackStackEntryCount();
if (backStackEntryCount == 0) {
finish();
}
if ((backStackEntryCount - 1)>=0) {
Fragment fragment = manager.getFragments().get(backStackEntryCount - 1);
fragment.onResume();
}
}
}
});
fm.getBackStackEntryAt(fm.getBackStackEntryCount() - 1);
int pos = Integer.parseInt(title);
navigationView.getMenu().getItem(pos).setChecked(true);
fm.popBackStack();
}else{
getSupportActionBar().setSubtitle(null);
super.onBackPressed();
}
}
private void sub_recently_added(){
toolbar.setSubtitle(R.string.menu_recently_added);
Fragment fragment = RecentFragment.newInstance(0, getString(R.string.menu_recently_added));
android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.frame, fragment);
fragmentTransaction.addToBackStack("" + previousDrawerItemChecked).commit();
}
private void sub_search_results(String searchQuery){
Fragment fragment = SearchFragment.newInstance(searchQuery);
android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.frame, fragment);
fragmentTransaction.addToBackStack("" + previousDrawerItemChecked).commit();
}
public void sub_label_results(String label){
toolbar.setSubtitle("Category: " + label);
Fragment fragment = LabelsFragment.newInstance(label);
android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.frame, fragment);
fragmentTransaction.addToBackStack("" + previousDrawerItemChecked).commit();
}
private void sub_labels_results(){
toolbar.setSubtitle("Categories");
Fragment fragment = LabelsListFragment.newInstance();
android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.frame, fragment);
fragmentTransaction.addToBackStack("" + previousDrawerItemChecked).commit();
}
private void sub_about_fragment(){
toolbar.setSubtitle(R.string.menu_about);
Fragment fragment = AboutFragment.newInstance();
android.support.v4.app.FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.frame, fragment);
fragmentTransaction.addToBackStack("" + previousDrawerItemChecked).commit();
}
@Override
protected void onResume() {
super.onResume();
//registerReceiver();
}
@Override
protected void onPause() {
//LocalBroadcastManager.getInstance(this).unregisterReceiver(mRegistrationBroadcastReceiver);
//isReceiverRegistered = false;
super.onPause();
}
private void registerReceiver(){
/*if(!isReceiverRegistered) {
LocalBroadcastManager.getInstance(this).registerReceiver(mRegistrationBroadcastReceiver,
new IntentFilter(Const.GCM_REGISTRATION_COMPLETE));
isReceiverRegistered = true;
}*/
}
/**
* Check the device to make sure it has the Google Play Services APK. If
* it doesn't, display a dialog that allows users to download the APK from
* the Google Play Store or enable it in the device's system settings.
*/
private boolean checkPlayServices() {
GoogleApiAvailability apiAvailability = GoogleApiAvailability.getInstance();
int resultCode = apiAvailability.isGooglePlayServicesAvailable(this);
if (resultCode != ConnectionResult.SUCCESS) {
if (apiAvailability.isUserResolvableError(resultCode)) {
apiAvailability.getErrorDialog(this, resultCode, PLAY_SERVICES_RESOLUTION_REQUEST)
.show();
} else {
Log.i(TAG, "This device is not supported.");
finish();
}
return false;
}
return true;
}
}
活动主.xml：
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:id="@+id/drawer"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".MainActivity">
<LinearLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:orientation="vertical">
<include
android:id="@+id/toolbar"
layout="@layout/toolbar"/>
<FrameLayout
android:id="@+id/frame"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</LinearLayout>
<!--app:itemBackground="@color/primary"-->
<android.support.design.widget.NavigationView
android:id="@+id/navigation_view"
android:layout_height="match_parent"
android:layout_width="wrap_content"
android:layout_gravity="end"
app:headerLayout="@layout/drawer_header"
app:itemIconTint="@drawable/navview_selected"
app:itemTextColor="@drawable/navview_selected"
app:menu="@menu/drawer_menu"
/>
</android.support.v4.widget.DrawerLayout>