Android课程---关于下拉列表与状态栏提示的学习
activity_ui7.xml
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.hanqi.test5.UIActivity7" android:orientation="vertical"> <AutoCompleteTextView android:layout_width="match_parent" android:layout_height="wrap_content" android:hint="自动完成的文本编辑框" android:id="@+id/actv_1"/> <Spinner android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/sp_1"></Spinner> <!--Spinner:下拉列表--> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="显示状态栏提示" android:onClick="notification_OnClick"/> </LinearLayout>
UIActivity7.java
package com.hanqi.test5; import android.app.Notification; import android.app.NotificationManager; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.AdapterView; import android.widget.ArrayAdapter; import android.widget.AutoCompleteTextView; import android.widget.Spinner; import android.widget.Toast; public class UIActivity7 extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_ui7); AutoCompleteTextView actv_1 = (AutoCompleteTextView)findViewById(R.id.actv_1); //设置自动完成的数据源 String[] strings = {"China","Child","Chile","Chinese","Add","All","Class"}; ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this,R.layout.layout_array,strings); actv_1.setAdapter(arrayAdapter); //下拉列表 Spinner sp_1 = (Spinner)findViewById(R.id.sp_1); sp_1.setAdapter(arrayAdapter); sp_1.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() { @Override public void onItemSelected(AdapterView<?> parent, View view, int position, long id) { Toast.makeText(UIActivity7.this, "position = " + position, Toast.LENGTH_SHORT).show(); } @Override public void onNothingSelected(AdapterView<?> parent) { Toast.makeText(UIActivity7.this, "什么也没选", Toast.LENGTH_SHORT).show(); } }); } public void notification_OnClick(View v) { //获取状态栏消息管理器 产生状态栏提示 NotificationManager nm = (NotificationManager)getSystemService(NOTIFICATION_SERVICE); //构造状态栏消息 Notification nt = new Notification.Builder(this) .setContentTitle("这是一条通知") .setContentText("这是通知内容:明天要休息了") .setTicker("显示在状态栏的新通知") .setSmallIcon(R.drawable.vipflower) .setAutoCancel(true) .setDefaults(Notification.DEFAULT_SOUND) .build(); //交给管理器发通知 nm.notify(0,nt); } }
显示效果如下: