andorid 配置器组件和提示消息

.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.application3.UIActivity7"
    android:orientation="vertical">

    <AutoCompleteTextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="自动完成文本编辑框"
        android:id="@+id/actv_1"/>
    <Spinner
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/sp_1">

    </Spinner>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="状态栏提示"
        android:onClick="notification_onClick"/>

</LinearLayout>

.java

package com.hanqi.application3;

import android.app.Notification;
import android.app.NotificationManager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
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","Ddp"};
        ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(this,R.layout.layout_array,strings);

        actv_1.setAdapter(arrayAdapter);

        //下拉列表
        Spinner sp1= (Spinner)findViewById(R.id.sp_1);

        sp1.setAdapter(arrayAdapter);

        sp1.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
        NotificationManager nm  = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);


        //
        Notification nt = new Notification.Builder(this)
                .setContentTitle("这是一个通知")
                .setContentText("这是通知内容：明天休息 ")
                .setTicker("新通知")
                .setSmallIcon(R.drawable.da1)
                .setAutoCancel(true)
                .setDefaults(Notification.DEFAULT_SOUND)

                .build();
        //交给管理器，发出消息
        nm.notify(0,nt);

    }
}

layout_array.xml

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="50dp"
    android:textSize="30sp"
    android:gravity="center_vertical"
    android:paddingLeft="10dp">

</TextView>