情况如下：我有两种类型的用户，type1 和 type2。两者都必须登录才能进入具有导航抽屉的主要活动。导航抽屉中的项目取决于用户的类型。在知道用户类型后，如何在运行时更改导航抽屉的项目。
MainActivity.java
package com.example.motassem.navdrawer;
import android.content.SharedPreferences;
import android.content.res.Configuration;
import android.preference.PreferenceManager;
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.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
private static final String SELECTED_ITEM_ID = "selected_item_id";
private static final String FIRST_TIME = "first_time";
private Toolbar mToolbar;
private NavigationView mDrawer;
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mDrawerToggle;
private int mSelectedID;
private boolean mUserSawDrawer = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//mMainLayout = (LinearLayout) findViewById(R.id.main_content);
mToolbar = (Toolbar) findViewById(R.id.app_bar);
setSupportActionBar(mToolbar);
mDrawer = (NavigationView) findViewById(R.id.main_drawer);
mDrawer.setNavigationItemSelectedListener(this);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerToggle = new ActionBarDrawerToggle(this,
mDrawerLayout, mToolbar,
R.string.drawer_open,
R.string.drawer_close);
mDrawerLayout.setDrawerListener(mDrawerToggle);
mDrawerToggle.syncState();
if (!didUserSeeDrawer()) {
showDrawer();
markDrawerSeen();
} else {
hideDrawer();
}
mSelectedID = savedInstanceState == null ? R.id.navigation_item_1 : savedInstanceState.getInt(SELECTED_ITEM_ID);
if (mSelectedID == R.id.navigation_item_1) {
// This is the first time i.e. NO FRAGMENTS WERE ADDED BEFORE..?
}
navigate(mSelectedID);
}
private boolean didUserSeeDrawer() {
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
return sharedPreferences.getBoolean(FIRST_TIME, false);
}
private void markDrawerSeen() {
SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
mUserSawDrawer = true;
sharedPreferences.edit().putBoolean(FIRST_TIME, mUserSawDrawer).apply();
}
private void hideDrawer() {
mDrawerLayout.closeDrawer(GravityCompat.START);
}
private void showDrawer() {
mDrawerLayout.openDrawer(GravityCompat.START);
}
private void navigate(int mSelectedID) {
switch (mSelectedID) {
// Edit here to navigate..
case R.id.navigation_item_1: // History was pressed.
mDrawerLayout.closeDrawer(GravityCompat.START);
getSupportFragmentManager().beginTransaction().replace(R.id.main_content, new FragmentTotal()).commit();
break;
case R.id.navigation_item_2: // Stores was pressed.
mDrawerLayout.closeDrawer(GravityCompat.START);
getSupportFragmentManager().beginTransaction().replace(R.id.main_content, new FragmentTransactionComplete()).commit();
break;
case R.id.navigation_item_3: // Settings was pressed.
mDrawerLayout.closeDrawer(GravityCompat.START);
getSupportFragmentManager().beginTransaction().replace(R.id.main_content, new FragmentUpdateCard()).commit();
break;
}
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
mDrawerToggle.onConfigurationChanged(newConfig);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.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);
}
@Override
public boolean onNavigationItemSelected(MenuItem menuItem) {
menuItem.setChecked(true);
mSelectedID = menuItem.getItemId();
navigate(mSelectedID);
return true;
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt(SELECTED_ITEM_ID, mSelectedID);
}
@Override
public void onBackPressed() {
if (mDrawerLayout.isDrawerOpen(GravityCompat.START)) {
mDrawerLayout.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
}
活动_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="com.example.motassem.navdrawer.MainActivity">
<LinearLayout
android:id="@+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
android:id="@+id/app_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/colorPrimary"
android:minHeight="?attr/actionBarSize"
app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
</android.support.v7.widget.Toolbar>
</LinearLayout>
<android.support.design.widget.NavigationView
android:id="@+id/main_drawer"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
app:headerLayout="@layout/drawer_header"
app:itemIconTint="@color/colorAccent"
app:itemTextColor="@color/colorTextSecondary"
app:menu="@menu/menu_drawer">
</android.support.design.widget.NavigationView>
</android.support.v4.widget.DrawerLayout>
菜单项.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:id="@+id/navigation_item_1"
android:icon="@drawable/ic_history"
android:title="@string/navigation_item_1" />
<item
android:id="@+id/navigation_item_2"
android:icon="@drawable/ic_cart"
android:title="@string/navigation_item_2" />
<item
android:id="@+id/navigation_item_3"
android:icon="@drawable/ic_card"
android:title="@string/navigation_item_3" />
</menu>
