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法律研究如何在Android中创建自定义导航抽屉？
此示例演示如何在Android应用程序中调整图像大小。
步骤1 - 在Android Studio中创建一个新项目，转到文件⇒新建项目，并填写所有必需的详细信息以创建新项目。
步骤2 - 将以下代码添加到res/layout/activity_main.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_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" /> </android.support.v4.widget.DrawerLayout>
步骤3 - 将以下代码添加到res/layout/nav_header_main.xml。
<? xml version= "1.0" encoding= "utf-8" ?> <LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" xmlns: app = "http://schemas.android.com/apk/res-auto" android :layout_width= "match_parent" android :layout_height= "@dimen/nav_header_height" android :background= "@drawable/side_nav_bar" android :gravity= "bottom" android :orientation= "vertical" android :paddingLeft= "@dimen/activity_horizontal_margin" android :paddingTop= "@dimen/activity_vertical_margin" android :paddingRight= "@dimen/activity_horizontal_margin" android :paddingBottom= "@dimen/activity_vertical_margin" android :theme= "@style/ThemeOverlay.AppCompat.Dark" > <ImageView android :id= "@+id/imageView" android :layout_width= "wrap_content" android :layout_height= "wrap_content" android :contentDescription= "@string/nav_header_desc" android :paddingTop= "@dimen/nav_header_vertical_spacing" app :srcCompat= "@mipmap/ic_launcher_round" /> <TextView android :layout_width= "match_parent" android :layout_height= "wrap_content" android :paddingTop= "@dimen/nav_header_vertical_spacing" android :text= "@string/nav_header_title" android :textAppearance= "@style/TextAppearance.AppCompat.Body1" /> <TextView android :id= "@+id/textView" android :layout_width= "wrap_content" android :layout_height= "wrap_content" android :text= "@string/nav_header_subtitle" /> </LinearLayout>
步骤4 - 将以下代码添加到res/layout/app_bar_main.xml。
<? xml version= "1.0" encoding= "utf-8" ?> <android.support.design.widget.CoordinatorLayout 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 :layout_width= "match_parent" android :layout_height= "match_parent" tools :context= ".MainActivity" > <android.support.design.widget.AppBarLayout android :layout_width= "match_parent" android :layout_height= "wrap_content" android :theme= "@style/AppTheme.AppBarOverlay" > <android.support.v7.widget.Toolbar android :id= "@+id/toolbar" android :layout_width= "match_parent" android :layout_height= "?attr/actionBarSize" android :background= "?attr/colorPrimary" app :popupTheme= "@style/AppTheme.PopupOverlay" /> </android.support.design.widget.AppBarLayout> <include layout= "@layout/content_main" /> <android.support.design.widget.FloatingActionButton android :id= "@+id/fab" android :layout_width= "wrap_content" android :layout_height= "wrap_content" android :layout_gravity= "bottom|end" android :layout_margin= "@dimen/fab_margin" app :srcCompat= "@android:drawable/ic_dialog_email" /> </android.support.design.widget.CoordinatorLayout>
步骤5 - 将以下代码添加到res/layout/content_main.xml。
<? xml version= "1.0" encoding= "utf-8" ?> <android.support.constraint.ConstraintLayout 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 :layout_width= "match_parent" android :layout_height= "match_parent" app :layout_behavior= "@string/appbar_scrolling_view_behavior" tools :context= ".MainActivity" tools :showIn= "@layout/app_bar_main" > </android.support.constraint.ConstraintLayout>
步骤6 - 将以下代码添加到res/menu/activity_main_drawer.xml。
<? xml version= "1.0" encoding= "utf-8" ?> <menu xmlns: android = "http://schemas.android.com/apk/res/android" xmlns: tools = "http://schemas.android.com/tools" tools :showIn= "navigation_view" > <group android :checkableBehavior= "single" > <item android :id= "@+id/nav_camera" android :icon= "@drawable/ic_menu_camera" android :title= "Import" /> <item android :id= "@+id/nav_gallery" android :icon= "@drawable/ic_menu_gallery" android :title= "Gallery" /> <item android :id= "@+id/nav_slideshow" android :icon= "@drawable/ic_menu_slideshow" android :title= "Slideshow" /> <item android :id= "@+id/nav_manage" android :icon= "@drawable/ic_menu_manage" android :title= "Tools" /> </group> <item android :title= "Communicate" > <menu> <item android :id= "@+id/nav_share" android :icon= "@drawable/ic_menu_share" android :title= "Share" /> <item android :id= "@+id/nav_send" android :icon= "@drawable/ic_menu_send" android :title= "Send" /> </menu> </item> </menu>
步骤7 - 将以下代码添加到src/MainActivity.java
package app.tutorialspoint.com.sample ;
import android.os.Bundle ;
import android.support.annotation. NonNull ;
import android.support.design.widget.FloatingActionButton ;
import android.support.design.widget.Snackbar ;
import android.view.View ;
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 = findViewById(R.id. toolbar ) ;
setSupportActionBar(toolbar) ;
FloatingActionButton fab = findViewById(R.id. fab ) ;
fab.setOnClickListener( new View.OnClickListener() {
@Override
public void onClick (View view) {
Snackbar. make (view , "Replace with your own action" ,
Snackbar. LENGTH_LONG )
.setAction( "Action" , null ).show() ;
}
}) ;
DrawerLayout drawer = 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 = findViewById(R.id. nav_view ) ;
navigationView.setNavigationItemSelectedListener( this ) ;
}
@Override
public void onBackPressed () {
DrawerLayout drawer = 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) {
int id = item.getItemId() ;
if (id == R.id. action_settings ) {
return true;
}
return super .onOptionsItemSelected(item) ;
}
@SuppressWarnings ( "StatementWithEmptyBody" )
@Override
public boolean onNavigationItemSelected ( @NonNull MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId() ;
if (id == R.id. nav_camera ) {
// Handle the camera action
} else if (id == R.id. nav_gallery ) {
} else if (id == R.id. nav_slideshow ) {
} else if (id == R.id. nav_manage ) {
} else if (id == R.id. nav_share ) {
} else if (id == R.id. nav_send ) {
}
DrawerLayout drawer = findViewById(R.id. drawer_layout ) ;
drawer.closeDrawer(GravityCompat. START ) ;
return true;
}
}步骤8 - 将以下代码添加到androidManifest.xml
<? xml version= "1.0" encoding= "utf-8" ?> <manifest xmlns: android = "http://schemas.android.com/apk/res/android" package= "app.tutorialspoint.com.sample" > <application android :allowBackup= "true" android :icon= "@mipmap/ic_launcher" android :label= "@string/app_name" android :roundIcon= "@mipmap/ic_launcher_round" android :supportsRtl= "true" android :theme= "@style/AppTheme" > <activity android :name= ".MainActivity" android :theme= "@style/AppTheme.NoActionBar" > <intent-filter> <action android :name= "android.intent.action.MAIN" /> <category android :name= "android.intent.category.LAUNCHER" /> </intent-filter> </activity> </application> </manifest>
让我们尝试运行您的应用程序。我假设您已将您的实际Android移动设备连接到您的计算机。要在Android Studio中运行应用程序，请打开项目中的一个活动文件，然后单击工具栏中的运行
图标。选择您的移动设备作为选项，然后检查您的移动设备，它将显示您的默认屏幕 -
更新于：2019年7月30日
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