版本更新

<span style="background-color: rgb(255, 0, 0);">
///MainActivity中</span>
package test.bwie.com.gaoxuge20160701;

import android.app.AlertDialog;
import android.app.DownloadManager;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.List;

import test.bwie.com.gaoxuge20160701.adapter.MyAdapter;
import test.bwie.com.gaoxuge20160701.bean.NewsBean;
import test.bwie.com.gaoxuge20160701.bean.VersionBean;
import test.bwie.com.gaoxuge20160701.utils.NetWorkUtils;
import test.bwie.com.gaoxuge20160701.utils.PullUtils;
import test.bwie.com.gaoxuge20160701.utils.VerSionUtils;

public class MainActivity extends AppCompatActivity {

private Button newcode;
private ListView lv;
private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);
//            Toast.makeText(MainActivity.this, "====="+list.toString(), Toast.LENGTH_SHORT).show();
switch (msg.what) {
case 0:
//给listview设置适配器
MyAdapter adapter = new MyAdapter(MainActivity.this, list);
lv.setAdapter(adapter);
break;
case 1:
try {
//判断版本号并弹出是否更新的提示框
updataInfo = VerSionUtils.getUpdataInfo(inputstreams);
int verCode = VerSionUtils.getVerCode(MainActivity.this);
//打印当前的版本号
System.out.println("当前版本号====="+verCode);
if (verCode < Integer.parseInt(updataInfo.getVersionCode())) {
//弹出是否更新的提示框
showUpdataDialog();
} else {
Toast.makeText(MainActivity.this, "已经是最新版本，无须更新", Toast.LENGTH_SHORT).show();
}
} catch (Exception e) {
e.printStackTrace();
}
break;
}

}
};
private String path = "http://www.oschina.net/action/api/news_list?catalog=1&pageIndex=0&pageSize=20";
private PullUtils utils = new PullUtils();
private List<NewsBean> list;
private InputStream inputstreams;
private VersionBean updataInfo;
private DownloadManager downloadManager;
private ProgressDialog pd;    //进度条对话框

private Handler m_mainHandler =new Handler();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

//创建ProgressDialog对象
pd = new  ProgressDialog(this);
pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pd.setMessage("正在下载更新");
//找控件
initView();
//请求数据
initData();
//控件的点击事件
setlistener();
}

private void setlistener() {
//版本更新的点击事件
newcode.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
updatasapk();
}
});

}

//从网络请求数据返回流 并给handler发送消息，进行解析判断
private void updatasapk() {
new Thread() {
@Override
public void run() {
super.run();
inputstreams = NetWorkUtils.getInputstreams("http://www.oschina.net/MobileAppVersion.xml");
handler.sendEmptyMessage(1);
}
}.start();
}

/**
* 从网络请求数据
*/
private void initData() {
new Thread() {
@Override
public void run() {
super.run();
String string = NetWorkUtils.getString(path);
//                System.out.println("======"+string);
//解析xml
list = utils.getlist(string);
//给handler发送消息进行适配器的设置
handler.sendEmptyMessage(0);

}
}.start();
}

/**
* 找控件
*/
private void initView() {
newcode = (Button) findViewById(R.id.newcode);
lv = (ListView) findViewById(R.id.lv);
}

/*
*
* 弹出对话框通知用户更新程序
*
* 弹出对话框的步骤：
*  1.创建alertDialog的builder.
*  2.要给builder设置属性, 对话框的内容,样式,按钮
*  3.通过builder 创建一个对话框
*  4.对话框show()出来
*/
protected void showUpdataDialog() {
AlertDialog.Builder builer = new AlertDialog.Builder(this);
builer.setTitle("版本升级");
builer.setMessage(updataInfo.getUpdateLog());
//当点确定按钮时从服务器上下载 新的apk 然后安装
builer.setPositiveButton("确定", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
Log.i("sss", "下载apk,更新");
//                downLoadApk();
downFile(updataInfo.getDownloadUrl());
}
});
//当点取消按钮时进行登录
builer.setNegativeButton("取消", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {

}
});
AlertDialog dialog = builer.create();
dialog.show();
}

private void downFile(final String url)
{
//提示框显示
pd.show();
//开启子线程下载apk
new Thread() {
public void run() {
//创建HttpClient
HttpClient client = new DefaultHttpClient();
//请求方式
HttpGet get = new HttpGet(url);
HttpResponse response;
try {
//请求网络
response = client.execute(get);
HttpEntity entity = response.getEntity();
long length = entity.getContentLength();

//设置进度条的最大值
pd.setMax((int)length);
//获取流
InputStream is = entity.getContent();
FileOutputStream fileOutputStream = null;
//将流写到sd卡中
if (is != null) {
File file = new File(
Environment.getExternalStorageDirectory(),
"updata.spk");
fileOutputStream = new FileOutputStream(file);
byte[] buf = new byte[1024];
int ch = -1;
int count = 0;
//循环将请求的数据写到sd卡
while ((ch = is.read(buf)) != -1) {
fileOutputStream.write(buf, 0, ch);
count += ch;
if (length > 0) {
pd.setProgress(count);//设置当前进度
}
}
}
fileOutputStream.flush();
if (fileOutputStream != null) {
fileOutputStream.close();
}
//告诉HANDER已经下载完成了，可以安装了
down();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
}
//提示框消失，进行安装
private void down() {
m_mainHandler.post(new Runnable() {

4000
public void run() {
pd.cancel();
update();
}
});
}
/**
* 安装程序
*/
void update() {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(Environment
.getExternalStorageDirectory(),"updata.spk")),"application/vnd.android.package-archive");
startActivity(intent);
}

}