andorid 多线程handler用法

.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"

        android:completionThreshold="1"/>

    <!--completionThreshold 提示所需要的字符-->

    <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"/>

    <ImageView

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:src="@drawable/da2"

        android:id="@+id/iv_3"/>

</LinearLayout>

.java

package com.hanqi.application3;

import android.app.Notification;

import android.app.NotificationManager;

import android.app.PendingIntent;

import android.content.Intent;

import android.os.Handler;

import android.os.Message;

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.ImageView;

import android.widget.Spinner;

import android.widget.Toast;

import java.util.Timer;

import java.util.TimerTask;

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

        String[] strings1 = {"China","Child","Chile","Chinese","Add","All","Class","Ddp"};

        ArrayAdapter<String> arrayAdapter1 = new ArrayAdapter<String>(this,R.layout.layout_array,strings1);

        Spinner sp1= (Spinner)findViewById(R.id.sp_1);

        sp1.setAdapter(arrayAdapter1);

        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();

            }

        });

        //handler

        final ImageView iv3 = (ImageView)findViewById(R.id.iv_3);

        final int[] iImageid = {R.drawable.da1,R.drawable.da2,R.drawable.da3,R.drawable.da4};

        //继承Handler

        final Handler handler = new Handler()

        {

            int i = 0;

            //处理消息的回调方法

            //重写

            @Override

            public void handleMessage(Message msg) {

                super.handleMessage(msg);

                //判断消息的类别

                if(msg.what ==1)

                {

                    //切换图片

                    iv3.setImageResource(iImageid[i++ % iImageid.length]);

//                    i++;

//                    if(i==10)

//                    {

//                        i=0;

//                    }

                }

            }

        };

        //在新线程发送消息

        //定式循环发送

        //定时器：启动新线程，定时执行代码

        new Timer().schedule(new TimerTask() {

            @Override

            public void run() {

                //发送消息

                //空消息

                handler.sendEmptyMessage(1);

            }

        },1000,2000);

    }

    public void notification_onClick(View v)

    {

        //1.获取状态栏消息管理器

        NotificationManager nm  = (NotificationManager)getSystemService(NOTIFICATION_SERVICE);

        //3.构建意图

        Intent intent = new Intent(this,UIActivity2.class);

        //4.获取PendingIntent

        PendingIntent pendingIntent = PendingIntent.getActivity(this,0,intent,0);

        //2.构建消息   方法链调用

        Notification nt = new Notification.Builder(this)

                .setContentTitle("这是一个通知")

                .setContentText("这是通知内容：点击打开新的界面 ")

                .setTicker("新通知")

                .setSmallIcon(R.drawable.da1)//图片

                .setAutoCancel(true)

                .setDefaults(Notification.DEFAULT_ALL)//声音

                .setContentIntent(pendingIntent)

                .build();

        //交给管理器，发出消息

        nm.notify(0,nt);

    }

}

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andorid 多线程handler用法

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