【android编程】 第六讲-Android菜单实践题
16lz
2021-01-23
【android编程】 第六讲-Android菜单实践题
笔记链接：https://blog.csdn.net/xbean1028/article/details/104797732
文章目录
- 【android编程】 第六讲-Android菜单实践题
- 1. 带子菜单的选项菜单练习
- 1. 效果展示
- 2. menu\menu_main.xml
- 2. MainActivity.java
- 2. 上下文菜单（长按）练习
- 1. 效果展示
- 2. activity_main.xml
- 3. MainActivity.java
1. 带子菜单的选项菜单练习
1. 效果展示
2. menu\menu_main.xml
<?xml version="1.0" encoding="utf-8"?><menu xmlns:android="http://schemas.android.com/apk/res/android" android:checkableBehavior="all"> <item android:id="@+id/item1" android:alphabeticShortcut="e" android:title="File"> <menu> <group android:id="@+id/file"> <item android:id="@+id/open" android:title="Open">item> <item android:id="@+id/close" android:title="Close">item> group> menu> item> <group android:checkableBehavior="all"> <item android:id="@+id/item2" android:title="文本文件" android:alphabeticShortcut="r">item> <item android:id="@+id/item3" android:alphabeticShortcut="g" android:title="二进制文件">item> group>menu>2. MainActivity.java
package com.example.bean.myapplicationv0;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.Menu;import android.view.MenuItem;import android.widget.Toast;public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); } public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu_main,menu); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()){ case R.id.item1: Toast.makeText(this,"File", Toast.LENGTH_SHORT).show(); break; case R.id.item2: Toast.makeText(this,"文本文件", Toast.LENGTH_SHORT).show(); break; case R.id.item3: Toast.makeText(this,"二进制文件", Toast.LENGTH_SHORT).show(); break; case R.id.open: Toast.makeText(this,"Open", Toast.LENGTH_SHORT).show(); break; case R.id.close: Toast.makeText(this,"Close", Toast.LENGTH_SHORT).show(); break; default: break; } return super.onOptionsItemSelected(item); }}2. 上下文菜单（长按）练习
1. 效果展示
2. activity_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" tools:context="com.example.bean.myapplicationv2.MainActivity"> <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:id="@+id/textView" app:layout_constraintVertical_bias="0.658" /> <ImageView android:id="@+id/imageView" android:layout_width="368dp" android:layout_height="wrap_content" app:srcCompat="@drawable/y20" app:layout_constraintTop_toTopOf="parent" android:layout_marginTop="8dp" android:layout_marginLeft="8dp" app:layout_constraintLeft_toLeftOf="parent" android:layout_marginRight="8dp" app:layout_constraintRight_toRightOf="parent" />android.support.constraint.ConstraintLayout>3. MainActivity.java
package com.example.bean.myapplicationv2;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.view.ContextMenu;import android.view.MenuItem;import android.view.View;import android.widget.ImageView;import android.widget.Toast;public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ImageView image = (ImageView)findViewById(R.id.imageView); registerForContextMenu(image); } @Override public boolean onContextItemSelected(MenuItem item) { Toast.makeText(this,item.getTitle(),Toast.LENGTH_SHORT).show(); return super.onOptionsItemSelected(item); } @Override public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { super.onCreateContextMenu(menu, v, menuInfo); menu.setHeaderTitle("图中的飞机是"); menu.add(1,1,1,"轰战机"); menu.add(1,2,1,"运输机"); }}更多相关文章
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