android版本更新代码

package com.itheima.mobilesafe104;

import android.app.Activity;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AlertDialog;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

import org.json.JSONException;
import org.json.JSONObject;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.concurrent.TimeUnit;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okhttp3.ResponseBody;

/**
* Created by HASEE.
*/

public class SplashActivity extends Activity {
private static final String TAG = "SplashActivity";
@BindView(R.id.tv_version_name)//注解,就等同于findViewById(R.id.xxx)找的过程
TextView tvVersionName;//将findViewById(R.id.xxx)找到的控件赋值给tvVersionName
private int localVersionCode;
private String desc;
private String downloadUrl;
private ProgressDialog progressDialog;

// private TextView tvVersionName;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
ButterKnife.bind(this);

//获取主线程id
// Log.i(TAG,"主线程id = "+Thread.currentThread().getId());

//ButterKnife------->替代findViewById
// tvVersionName = (TextView) findViewById(R.id.tv_version_name);
/*tvVersionName.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {

}
});*/

//获取版本名称方法
String packageVersionName = getPackageVersionName();
tvVersionName.setText(packageVersionName);
//在应用程序上,有一个versioncode,将本地的versioncode和服务器上的versioncode做一个比对
//本地versionCode(localVersionCode)<服务器versionCode(remoteVersionCode),则需要下载更新.
checkVersion();
}

private void checkVersion() {
//1.获取本地VersionCode
localVersionCode = getPackageVersionCode();
//2.发送网络请求,获取服务器的versionCode,okhttp加jar包 okhttp和okio这2个jar包
//通过分析,服务器必须提供,versionCode,downloadUrl,新版本的描述,新版本的版本名称,json
//2.1 创建一个客户端,此客户端可以给服务器发请求
OkHttpClient okHttpClient = new OkHttpClient.Builder()
.readTimeout(20, TimeUnit.SECONDS)
.connectTimeout(20,TimeUnit.SECONDS).
build();
//2.2 请求对象创建
String url = "http://10.0.2.2:8080/update.json";
Request request = new Request.Builder()
.get()
.url(url)
.build();
//2.3 通过客户端把请求发出去
Call call = okHttpClient.newCall(request);
//2.4 处理请求的结果
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
//请求失败
// Log.i(TAG,"onFailure........");
}

@Override
public void onResponse(Call call, Response response) throws IOException {
//请求有结果,成功
// Log.i(TAG,"onResponse........");
//子线程中触发onResponse方法,不能够操作UI
// Log.i(TAG,"onResponse方法所在线程的id = "+Thread.currentThread().getId());
//获取服务器中的json里面的数据
ResponseBody body = response.body();
String json = body.string();
// Log.i(TAG,"json = "+json);
//手动解析,gson概率高
try {
JSONObject jsonObject = new JSONObject(json);

desc = jsonObject.getString("desc");
downloadUrl = jsonObject.getString("downloadUrl");
int remoteVersionCode = jsonObject.getInt("versionCode");

//服务器和本地的versionCode进行比对
if (remoteVersionCode>localVersionCode){
//服务器有新版本,可供下载
runOnUiThread(new Runnable() {
@Override
public void run() {
showDialog();
}
});
}else{
//服务器没有更新的版本,可以直接进入应用程序的后一个界面
}
} catch (JSONException e) {
e.printStackTrace();
}
}
});
}

private void showDialog() {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("是否下载新版本?");
builder.setMessage(desc);//设置对话框除标题外的描述内容
builder.setPositiveButton("立即更新", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
//下载apk,下载路径downloadUrl,考虑在何处存储 files cache() sd卡
downloadApk();
}
});
builder.setNegativeButton("稍后再说", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
//跳转到应用程序的后一个界面
enterHome();
}
});
builder.show();
}

private void downloadApk() {
//下载apk,并且指定放置下载文件的路径,sd卡
if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)){
//创建一个进度条对话框,用于显示下载进度
progressDialog = new ProgressDialog(this);
//默认情况下对话框进度条圆形转圈的
progressDialog.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
progressDialog.show();

//手机的sd卡可用
//sd卡存储文件的路径
final String path = Environment.getExternalStorageDirectory().getAbsolutePath()
+File.separator+"mobilesafe.apk";
//如何根据downloadUrl进行下载,okhttp下载
OkHttpClient okHttpClient = new OkHttpClient.Builder()
.connectTimeout(20, TimeUnit.SECONDS)
.readTimeout(20, TimeUnit.SECONDS)
.build();
Request request = new Request.Builder()
.get()
.url(downloadUrl)
.build();
okHttpClient.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
//请求失败
}
@Override
public void onResponse(Call call, Response response) throws IOException {
//请求成功,从服务器的响应对象中获取apk,流(服务器输入流(提供数据) 本地输出流(写入文件))
ResponseBody body = response.body();
//告知progressDialog总进度,不变
progressDialog.setMax((int) body.contentLength());

//inputStream就是服务器把需要下载的apk以流的形式提供给客户端
InputStream inputStream = body.byteStream();
File file = new File(path);
FileOutputStream fos = new FileOutputStream(file);

byte[] bytes = new byte[1024];
int len = 0;
int temp = 0;//用于记录目前下载的到的位置
while((len = inputStream.read(bytes))!=-1){
//将读过的数据写入文件中
fos.write(bytes,0,len);
//告知progressDialog在下载过程中的当前进度
temp += len;
//将当前的下载位置,设置给progressDialog
progressDialog.setProgress(temp);
//没下载一段数据,睡眠一段时间
try {
Thread.sleep(1);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
//一旦循环结束,则sd卡中就有一个从服务器下载下来的apk
//下载完成后,则隐藏对话框
progressDialog.dismiss();
//安装apk,这个要装的apk在哪里
installApk(file);
}
});
}
}

/**
* 安装指定路径下的apk
* @param file 需要安装文件的路径
*/
private void installApk(File file) {
//找到系统的安装界面,把安装过程中要用到的东西传递进去,让系统帮助我们安装.
/*

*/
Intent intent = new Intent("android.intent.action.VIEW");
intent.addCategory("android.intent.category.DEFAULT");
intent.setDataAndType(Uri.fromFile(file),"application/vnd.android.package-archive");
//通过隐式意图开启系统的安装apk界面
startActivity(intent);
}

private void enterHome() {
Intent intent = new Intent(this, HomeActivity.class);
startActivity(intent);
finish();
}

private String getPackageVersionName() {
//1.PackageManager 包的管理者对象
PackageManager pm = getPackageManager();
//2.获取应用的配置信息,在此处传递0获取的是基本信息(包名,版本名称,版本号)
try {
PackageInfo packageInfo = pm.getPackageInfo(getPackageName(),0);
String versionName = packageInfo.versionName;
return versionName;
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
return "";
}

private int getPackageVersionCode() {
//1.PackageManager 包的管理者对象
PackageManager pm = getPackageManager();
//2.获取应用的配置信息,在此处传递0获取的是基本信息(包名,版本名称,版本号)
try {
PackageInfo packageInfo = pm.getPackageInfo(getPackageName(),0);
int versionCode = packageInfo.versionCode;
return versionCode;
} catch (PackageManager.NameNotFoundException e) {
e.printStackTrace();
}
return 0;
}
//给tvVersionName注册上了点击事件
@OnClick(R.id.tv_version_name)
public void onViewClicked() {
//此方法中的代码,就等同于onClick中的代码
}
}

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