Java 如何在Android中以编程方式更改xml参数
我一直在开发一款需要根据用户类型更改导航菜单选项的应用程序。要显示导航菜单,我使用NavigationView。我唯一坚持的部分是将Java 如何在Android中以编程方式更改xml参数,java,android,xml,navbar,Java,Android,Xml,Navbar,我一直在开发一款需要根据用户类型更改导航菜单选项的应用程序。要显示导航菜单,我使用NavigationView。我唯一坚持的部分是将app:menu参数更改为另一个菜单设计(activity\u nav\u drawer2.xml) activity_nav.xml <?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.DrawerLayout xmlns:android="http://schem
app:menu
参数更改为另一个菜单设计(activity\u nav\u drawer2.xml)
activity_nav.xml
<?xml version="1.0" encoding="utf-8"?>
<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"
android:fitsSystemWindows="true"
tools:openDrawer="start">
<include
layout="@layout/app_bar_nav"
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_nav"
app:menu="@menu/activity_nav_drawer" />
</android.support.v4.widget.DrawerLayout>
activity_nav_drawer.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<group android:checkableBehavior="single">
<item
android:id="@+id/nav_Home"
android:title="Home" />
<item
android:id="@+id/nav_Festivities"
android:title="Festivities" />
<!--<item-->
<!--android:id="@+id/nav_Announcements"-->
<!--android:title="Announcements" />-->
<!--<item-->
<!--android:id="@+id/nav_Payment"-->
<!--android:title="Payment" />-->
<!--<item-->
<!--android:id="@+id/nav_Settings"-->
<!--android:title="Settings" />-->
<item
android:id="@+id/nav_myCode"
android:title="My Code" />
<item
android:id="@+id/nav_readCode"
android:title="Read Code" />
</group>
<!--<group android:checkableBehavior="single">-->
<!--<item-->
<!--android:id="@+id/nav_organizer"-->
<!--android:title="Become an organizer" />-->
<!--<item-->
<!--android:id="@+id/nav_Legal"-->
<!--android:title="Legal" />-->
<!--</group>-->
</menu>
activity_nav2.xml
<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">
<group android:checkableBehavior="single">
<item
android:id="@+id/nav_Home"
android:title="Home" />
<item
android:id="@+id/nav_Festivities"
android:title="Create an Event" />
<item
android:id="@+id/nav_readCode"
android:title="Read Code" />
</group>
</menu>
MainActivity.java
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener{
public String eventKey;
private final int REQUEST_CAMERA_CODE = 1;
Intent intent = getIntent();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_nav);
MapFragment mapFragment = new MapFragment();
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(
R.id.content_nav,
mapFragment,
mapFragment.getTag()
).commit();
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.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView)
findViewById(R.id.nav_view);
navigationView.set
navigationView.setNavigationItemSelectedListener(this);
askPermissions(Manifest.permission.CAMERA, REQUEST_CAMERA_CODE);
}
@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.nav, 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_signOut){
FirebaseAuth.getInstance().signOut();
LoginManager.getInstance().logOut();
Intent intent = new Intent(MainActivity.this, LoginActivity.class);
startActivity(intent);
}
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.nav_Festivities) {
FestivitiesFragment festivitiesFragment = new FestivitiesFragment();
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(
R.id.content_nav,
festivitiesFragment,
festivitiesFragment.getTag()
).commit();
} else if (id == R.id.nav_myCode) {
getSupportFragmentManager().beginTransaction().replace(R.id.content_nav,new
CodeFragment()).commit();
} else if (id == R.id.nav_Home) {
MapFragment mapFragment = new MapFragment();
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(
R.id.content_nav,
mapFragment,
mapFragment.getTag()
).commit();
} else if (id == R.id.nav_readCode) {
ReadCodeFragment readCodeFragment = new ReadCodeFragment();
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(
R.id.content_nav,
readCodeFragment,
readCodeFragment.getTag()
).commit();
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
private void askPermissions(String permissions, int requestCode) {
if (ContextCompat.checkSelfPermission(this, permissions) !=
PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this, new String[]{permissions},
requestCode);
} else {
Toast.makeText(this, "Camera already Granted",
Toast.LENGTH_SHORT).show();
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[]
permissions, @NonNull int[] grantResults) {
}
}
activity_nav2.xml
MainActivity.java
公共类MainActivity扩展了AppCompatActivity
实现NavigationView.OnNavigationItemSelectedListener{
公共字符串eventKey;
私人最终int请求\摄像机\代码=1;
Intent=getIntent();
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_nav);
MapFragment MapFragment=新的MapFragment();
FragmentManager=getSupportFragmentManager();
manager.beginTransaction().replace(
R.id.content_nav,
地图碎片,
mapFragment.getTag()
).commit();
Toolbar Toolbar=(Toolbar)findViewById(R.id.Toolbar);
设置支持操作栏(工具栏);
抽屉布局抽屉=(抽屉布局)findViewById(R.id.抽屉布局);
ActionBarDrawerToggle切换=新建ActionBarDrawerToggle(
这个,抽屉,工具栏,R.string.navigation\u抽屉\u open,
R.string.navigation\u drawer\u close);
抽屉。添加抽屉链接器(切换);
toggle.syncState();
导航视图导航视图=(导航视图)
findViewById(R.id.nav_视图);
navigationView.set
navigationView.setNavigationItemSelectedListener(此);
askPermissions(Manifest.permission.CAMERA、REQUEST\u CAMERA\u代码);
}
@凌驾
public void onBackPressed(){
抽屉布局抽屉=(抽屉布局)findViewById(R.id.抽屉布局);
if(抽屉isDrawerOpen(重力压缩机启动)){
抽屉。关闭抽屉(重力压缩机启动);
}否则{
super.onBackPressed();
}
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
//为菜单充气;这会将项目添加到操作栏(如果存在)。
getMenuInflater().充气(R.menu.nav,menu);
返回true;
}
@凌驾
公共布尔值onOptionsItemSelected(菜单项项){
//处理操作栏项目单击此处。操作栏将
//自动处理Home/Up按钮上的点击,只要
//在AndroidManifest.xml中指定父活动时。
int id=item.getItemId();
//noinspection SimplifiableIf语句
if(id==R.id.action\u签出){
FirebaseAuth.getInstance().signOut();
LoginManager.getInstance().logOut();
意向意向=新意向(MainActivity.this、LoginActivity.class);
星触觉(意向);
}
返回super.onOptionsItemSelected(项目);
}
@SuppressWarnings(“StatementWithEmptyBody”)
@凌驾
公共布尔值onNavigationItemSelected(MenuItem项){
//处理导航视图项单击此处。
int id=item.getItemId();
if(id==R.id.nav_庆典){
FestitiesFragment FestitiesFragment=新的FestitiesFragment();
FragmentManager=getSupportFragmentManager();
manager.beginTransaction().replace(
R.id.content_nav,
节日片段,
festitiesfragment.getTag()
).commit();
}else if(id==R.id.nav_myCode){
getSupportFragmentManager().beginTransaction().replace(R.id.content\u导航,新
CodeFragment()).commit();
}else if(id==R.id.nav_Home){
MapFragment MapFragment=新的MapFragment();
FragmentManager=getSupportFragmentManager();
manager.beginTransaction().replace(
R.id.content_nav,
地图碎片,
mapFragment.getTag()
).commit();
}else if(id==R.id.nav_readCode){
ReadCodeFragment ReadCodeFragment=新的ReadCodeFragment();
FragmentManager=getSupportFragmentManager();
manager.beginTransaction().replace(
R.id.content_nav,
readCodeFragment,
readCodeFragment.getTag()
).commit();
}
抽屉布局抽屉=(抽屉布局)findViewById(R.id.抽屉布局);
抽屉。关闭抽屉(重力压缩机启动);
返回true;
}
私有void askPermissions(字符串权限,int requestCode){
if(ContextCompat.checkSelfPermission(this,permissions)!=
PackageManager.权限(已授予){
ActivityCompat.requestPermissions(这是新字符串[]{permissions},
请求代码);
}否则{
Toast.makeText(此“相机已授权”,
吐司。长度(短)。show();
}
}
@凌驾
public void onRequestPermissionsResult(int-requestCode,@NonNull字符串[])
权限,@NonNull int[]grantResults){
}
}
您可以根据用户类型设置不同菜单项的可见性。与其清除导航菜单项,不如相应地设置不同项的可见性。
navigationView.getMenu().clear();导航视图.充气菜单(右菜单.菜单id)