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法律研究Android 中 ActionBar 中的導航檢視
在進入導航檢視示例之前，我們應該瞭解導航檢視。導航檢視就像 HTML 中的滑動選單。導航檢視由導航抽屜擴充套件。導航檢視的大多數用例用於重定向不同的活動或顯示個人資料資訊。
此示例演示瞭如何在 ActionBar 中整合 NavigationView
步驟 1 - 在 Android Studio 中建立一個新專案，轉到檔案 ⇒ 新建專案，並填寫所有必需的詳細資訊以建立新專案。
步驟 2 - 建立專案時，我們應選擇導航抽屜活動，如下所示
選擇導航抽屜活動後，單擊下一步按鈕完成專案建立。
步驟 3 - 開啟專案結構以查詢佈局資料夾。Android Studio 生成不同的佈局，如下所示
activity_main.xml - 這是一個 MainActivity 佈局。它將建立抽屜佈局作為父佈局，子佈局包含導航檢視，如下所示
<?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>
在導航檢視中，它包含兩個佈局：標題佈局和選單佈局。標題佈局包含有關導航檢視標題的資訊，選單佈局包含有關選單列表的資訊。
app_bar_main.xml - 它是我們看到的普通佈局的佈局檔案。但它包含有關應用欄佈局（操作欄）、中心佈局的資訊。
<?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.CoordinatorLayout>
在上面的佈局中，我們包含了 content_main 佈局。它是使用者可以自定義自己的檢視的主佈局，如下所示
<?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"> <TextView android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:text = "Hello World!" app:layout_constraintBottom_toBottomOf = "parent" app:layout_constraintLeft_toLeftOf = "parent" app:layout_constraintRight_toRightOf = "parent" app:layout_constraintTop_toTopOf = "parent" /> </android.support.constraint.ConstraintLayout>
nav_header_main - 這是一個導航標題檢視，它包含有關導航標題的資訊。我們自定義了導航標題，如下所示
<?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 = "100dp" android:contentDescription = "@string/nav_header_desc" android:paddingTop = "@dimen/nav_header_vertical_spacing" app:srcCompat = "@drawable/logo" /> <TextView android:layout_width = "match_parent" android:layout_height = "wrap_content" android:paddingTop = "@dimen/nav_header_vertical_spacing" android:textColor = "#FFF" android:textStyle = "bold" android:text = "Tutorials Point" android:textAppearance = "@style/TextAppearance.AppCompat.Body1" /> <TextView android:id = "@+id/textView" android:textColor = "#FFF" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:text = "Father of all educational website" /> </LinearLayout>
注意 - 我們添加了 drawable/logo，在您開發應用程式時，請新增您自己的 logo。
activity_main_drawer - 這是一個選單佈局，位於 menu/activity_main_drawer.xml 中，如下所示
<?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>
步驟 4 - 將以下程式碼新增到 src/MainActivity.java 中
import android.os.Bundle;
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 = (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.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.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 = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}要關閉導航檢視，我們必須關閉抽屜，如下所示
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
}要更改導航檢視的位置，請使用以下程式碼
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout); drawer.closeDrawer(GravityCompat.END);
讓我們嘗試執行您的應用程式。我假設您已將您的實際 Android 移動裝置連線到您的計算機。要從 Android Studio 執行應用程式，請開啟專案中的一個活動檔案，然後單擊工具欄中的執行 
圖示。選擇您的移動裝置作為選項，然後檢查您的移動裝置，它將顯示您的預設螢幕
點選 此處 下載專案程式碼
更新於： 2019-07-30
899 次瀏覽
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