在android中制作一个RTL导航抽屉

我想让我的导航从以下位置打开right to left。但是，一旦我更改这些步骤中的任何一个，我的程序就会在运行应用程序后单击导航后面临错误强制关闭。

我的 main_activity.xml

<include
    layout="@layout/app_bar_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

<android.support.design.widget.NavigationView
    android:id="@+id/nav_view"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="start"
    android:fitsSystemWindows="true"
    app:headerLayout="@layout/nav_header_main"
    app:menu="@menu/activity_main_drawer" />

我的custom_toolbar.xml

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:layout_gravity="right"
    android:background="@color/colorPrimary">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="title"
        android:padding="8dp"
        android:textColor="#fff"
        android:textSize="18sp"
        />

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@drawable/cnews"
        android:tint="#fff"
        android:layout_gravity="right"
        />
</android.support.v7.widget.Toolbar>


//content
<include layout="@layout/content_main" /> </LinearLayout>

我的appbar_main.xml

<include layout="@layout/toolbar_main" />

我的 main_activity.java

import android.app.FragmentManager; import android.os.Bundle;  import android.support.design.widget.NavigationView;  import android.support.v4.view.GravityCompat;  import android.support.v4.widget.DrawerLayout;  import android.support.v7.app.ActionBarDrawerToggle;   import android.support.v7.app.AppCompatActivity;   import android.support.v7.widget.Toolbar; import android.view.Menu;   import android.view.MenuItem;

public class MainActivity extends AppCompatActivity
        implements NavigationView.OnNavigationItemSelectedListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
                this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
        drawer.setDrawerListener(toggle);
        toggle.syncState();

        NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
        navigationView.setNavigationItemSelectedListener(this);
    }

    @Override
    public void onBackPressed() {
        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        if (drawer.isDrawerOpen(GravityCompat.START)) {
            drawer.closeDrawer(GravityCompat.START);
        } else {
            super.onBackPressed();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }

    @SuppressWarnings("StatementWithEmptyBody")
    @Override
    public boolean onNavigationItemSelected(MenuItem item) {
        // Handle navigation view item clicks here.
        int id = item.getItemId();

        if (id == R.id.home_page) {
            Home_page_fragment homeFragment = new Home_page_fragment();
            FragmentManager manager = getFragmentManager();
            manager.beginTransaction().replace(R.id.mainContent , homeFragment, homeFragment.getTag()).commit();
        } else if (id == R.id.tour_page) {
            Tour_page_fragment tourFragment = new Tour_page_fragment();
            FragmentManager manager = getFragmentManager();
            manager.beginTransaction().replace(R.id.mainContent , tourFragment, tourFragment.getTag()).commit();

        } else if (id == R.id.lstour_page) {
            LsTour_page_fragment LstourFragment = new LsTour_page_fragment();
            FragmentManager manager = getFragmentManager();
            manager.beginTransaction().replace(R.id.mainContent , LstourFragment, LstourFragment.getTag()).commit();

        } else if (id == R.id.hotel_page) {

        } else if (id == R.id.agency_page) {

        } else if (id == R.id.news_page) {

        }else if (id == R.id.logbook_page) {

        }else if (id == R.id.message_page) {

        }else if (id == R.id.favorite_page) {

        }

        DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
        drawer.closeDrawer(GravityCompat.START);
        return true;
    } }

我变了"Start" to "end" in .xml主要活动和java主要活动强制关闭！

我将“开始”更改为“正确”强制关闭！

I used RTL library但再次被强制关闭！

提前致谢。

问题是您自定义的 Gravity 未定义并返回 NULL。 首先，您应该更新您的menu.xml并构建一个项目作为右侧菜单的图标，如下所示：

<item
        android:id="@+id/menu_right"
        android:orderInCategory="100"
        android:showAsAction="always"
        android:icon="@android:drawable/ic_dialog_dialer"
        android:title="@string/action_menuright"
/>

And in main_activity.java禁用从左侧打开的默认切换抽屉并更新：

toggle.syncState();
toggle.setDrawerIndicatorEnabled(false);//this is added line

并类似地更新这个：

public class MainActivity extends AppCompatActivity
    implements NavigationView.OnNavigationItemSelectedListener {
         <   here:  add this line:  >
    DrawerLayout drawer;

最后将这个类更改为：

public boolean onOptionsItemSelected(MenuItem item) {
    int id = item.getItemId();

    // noinspection SimplifiableIfStatement
    if (id == R.id.menu_right) {
        if(drawer.isDrawerOpen(Gravity.RIGHT) ) {
             drawer.closeDrawer(Gravity.RIGHT);
        }
        else{
             drawer.openDrawer(Gravity.RIGHT);
        }
        return true;
    }

    return super.onOptionsItemSelected(item);
}

现在一切都很好。