2014年5月8日：
andorid的app应用中都会有版本号更新的操作,今天空暇的时候就花了点心思弄了一下。主要技术方面用到了AsyncTask异步载入、http协议、json解析、获取版本号号等。。
。
以下就来介绍一下大概的流程吧。首先呢：
activity_main.xml：
<Button
android:id="@+id/chek_newest_version"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_margin="5dip"
android:text="检測最新版本号"/>
这里我就仅仅用了一个button了！
接下来mainactivity代码：
启动了异步载入来处理的，假设旧版本号小于新版本号号，就開始运行下载操作，否则就不更新！
一步步看吧！
public class MainActivity extends Activity {
Button m_btnCheckNewestVersion;
long m_newVerCode; //最新版的版本号号
String m_newVerName; //最新版的版本号名
String m_appNameStr; //下载到本地要给这个APP命的名字
Handler m_mainHandler;
ProgressDialog m_progressDlg;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//初始化相关变量
initVariable();
m_btnCheckNewestVersion.setOnClickListener(btnClickListener);
}
private void initVariable()
{
m_btnCheckNewestVersion = (Button)findViewById(R.id.chek_newest_version);
m_mainHandler = new Handler();
m_progressDlg = new ProgressDialog(this);
m_progressDlg.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
// 设置ProgressDialog 的进度条是否不明白 false 就是不设置为不明白
m_progressDlg.setIndeterminate(false);
m_appNameStr = "haha.apk";
}
OnClickListener btnClickListener = new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
new checkNewestVersionAsyncTask().execute();
}
};
class checkNewestVersionAsyncTask extends AsyncTask<Void, Void, Boolean>
{
@Override
protected Boolean doInBackground(Void... params) {
// TODO Auto-generated method stub
if(postCheckNewestVersionCommand2Server())
{
int vercode = Common.getVerCode(getApplicationContext()); // 用到前面第一节写的方法
if (m_newVerCode > vercode) {
return true;
} else {
return false;
}
}
return false;
}
@Override
protected void onPostExecute(Boolean result) {
// TODO Auto-generated method stub
if (result) {//假设有最新版本号
doNewVersionUpdate(); // 更新新版本号
}else {
notNewVersionDlgShow(); // 提示当前为最新版本号
}
super.onPostExecute(result);
}
@Override
protected void onPreExecute() {
// TODO Auto-generated method stub
super.onPreExecute();
}
}
/**
* 从服务器获取当前最新版本号号，假设成功返回TURE，假设失败。返回FALSE
* @return
*/
private Boolean postCheckNewestVersionCommand2Server()
{
StringBuilder builder = new StringBuilder();
JSONArray jsonArray = null;
try {
// 构造POST方法的{name:value} 參数对
List<NameValuePair> vps = new ArrayList<NameValuePair>();
// 将參数传入post方法中
vps.add(new BasicNameValuePair("action", "checkNewestVersion"));
builder = Common.post_to_server(vps);
Log.e("msg", builder.toString());
jsonArray = new JSONArray(builder.toString());
if (jsonArray.length()>0) {
if (jsonArray.getJSONObject(0).getInt("id") == 1) {
m_newVerName = jsonArray.getJSONObject(0).getString("verName");
m_newVerCode = jsonArray.getJSONObject(0).getLong("verCode");
return true;
}
}
return false;
} catch (Exception e) {
Log.e("msg",e.getMessage());
m_newVerName="";
m_newVerCode=-1;
return false;
}
}
/**
* 提示更新新版本号
*/
private void doNewVersionUpdate() {
int verCode = Common.getVerCode(getApplicationContext());
String verName = Common.getVerName(getApplicationContext());
String str= "当前版本号："+verName+" Code:"+verCode+" ,发现新版本号："+m_newVerName+
" Code:"+m_newVerCode+" ,是否更新？";
Dialog dialog = new AlertDialog.Builder(this).setTitle("软件更新").setMessage(str)
// 设置内容
.setPositiveButton("更新",// 设置确定button
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
m_progressDlg.setTitle("正在下载");
m_progressDlg.setMessage("请稍候...");
downFile(Common.UPDATESOFTADDRESS); //開始下载
}
})
.setNegativeButton("暂不更新",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
// 点击"取消"button之后退出程序
finish();
}
}).create();// 创建
// 显示对话框
dialog.show();
}
/**
* 提示当前为最新版本号
*/
private void notNewVersionDlgShow()
{
int verCode = Common.getVerCode(this);
String verName = Common.getVerName(this);
String str="当前版本号:"+verName+" Code:"+verCode+",/n已是最新版,无需更新!";
Dialog dialog = new AlertDialog.Builder(this).setTitle("软件更新")
.setMessage(str)// 设置内容
.setPositiveButton("确定",// 设置确定button
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
finish();
}
}).create();// 创建
// 显示对话框
dialog.show();
}
private void downFile(final String url)
{
m_progressDlg.show();
new Thread() {
public void run() {
HttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet(url);
HttpResponse response;
try {
response = client.execute(get);
HttpEntity entity = response.getEntity();
long length = entity.getContentLength();
m_progressDlg.setMax((int)length);//设置进度条的最大值
InputStream is = entity.getContent();
FileOutputStream fileOutputStream = null;
if (is != null) {
File file = new File(
Environment.getExternalStorageDirectory(),
m_appNameStr);
fileOutputStream = new FileOutputStream(file);
byte[] buf = new byte[1024];
int ch = -1;
int count = 0;
while ((ch = is.read(buf)) != -1) {
fileOutputStream.write(buf, 0, ch);
count += ch;
if (length > 0) {
m_progressDlg.setProgress(count);
}
}
}
fileOutputStream.flush();
if (fileOutputStream != null) {
fileOutputStream.close();
}
down(); //告诉HANDER已经下载完毕了，能够安装了
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
}
/**
* 告诉HANDER已经下载完毕了，能够安装了
*/
private void down() {
m_mainHandler.post(new Runnable() {
public void run() {
m_progressDlg.cancel();
update();
}
});
}
/**
* 安装程序
*/
void update() {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(Environment
.getExternalStorageDirectory(), m_appNameStr)),
"application/vnd.android.package-archive");
startActivity(intent);
}
}
最后是Common.java类:
类似一个工具类。非常多方法都写在这里面。下载完毕后，開始运行安装的操作！
public class Common {
public static final String SERVER_IP="http://192.168.1.105/";
public static final String SERVER_ADDRESS=SERVER_IP+"try_downloadFile_progress_server/index.php";//软件更新包地址
public static final String UPDATESOFTADDRESS=SERVER_IP+"try_downloadFile_progress_server/update_pakage/baidu.apk";//软件更新包地址
/**
* 向服务器发送查询请求，返回查到的StringBuilder类型数据
*
* @param ArrayList
* <NameValuePair> vps POST进来的參值对
* @return StringBuilder builder 返回查到的结果
* @throws Exception
*/
public static StringBuilder post_to_server(List<NameValuePair> vps) {
DefaultHttpClient httpclient = new DefaultHttpClient();
try {
HttpResponse response = null;
// 创建httpost.訪问本地服务器网址
HttpPost httpost = new HttpPost(SERVER_ADDRESS);
StringBuilder builder = new StringBuilder();
httpost.setEntity(new UrlEncodedFormEntity(vps, HTTP.UTF_8));
response = httpclient.execute(httpost); // 运行
if (response.getEntity() != null) {
// 假设服务器端JSON没写对。这句是会出异常。是运行只是去的
BufferedReader reader = new BufferedReader(
new InputStreamReader(response.getEntity().getContent()));
String s = reader.readLine();
for (; s != null; s = reader.readLine()) {
builder.append(s);
}
}
return builder;
} catch (Exception e) {
// TODO: handle exception
Log.e("msg",e.getMessage());
return null;
} finally {
try {
httpclient.getConnectionManager().shutdown();// 关闭连接
// 这两种释放连接的方法都能够
} catch (Exception e) {
// TODO Auto-generated catch block
Log.e("msg",e.getMessage());
}
}
}
/**
* 获取软件版本号号
* @param context
* @return
*/
public static int getVerCode(Context context) {
int verCode = -1;
try {
//注意："com.example.try_downloadfile_progress"相应AndroidManifest.xml里的package="……"部分
verCode = context.getPackageManager().getPackageInfo(
"com.example.try_downloadfile_progress", 0).versionCode;
} catch (NameNotFoundException e) {
Log.e("msg",e.getMessage());
}
return verCode;
}
/**
* 获取版本号名称
* @param context
* @return
*/
public static String getVerName(Context context) {
String verName = "";
try {
verName = context.getPackageManager().getPackageInfo(
"com.example.try_downloadfile_progress", 0).versionName;
} catch (NameNotFoundException e) {
Log.e("msg",e.getMessage());
}
return verName;
}
已经贴完成！
时间： 2024-10-11 23:25:28