<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.demo"
android:versionCode="1"
android:versionName="1.0.0">
<application>
</application>
</manifest>

public static int getVerCode(Context context) {
int verCode = -1;
try {
verCode = context.getPackageManager().getPackageInfo(
"com.demo", 0).versionCode;
} catch (NameNotFoundException e) {
Log.e(TAG, e.getMessage());
}
return verCode;
}
public static String getVerName(Context context) {
String verName = "";
try {
verName = context.getPackageManager().getPackageInfo(
"com.demo", 0).versionName;
} catch (NameNotFoundException e) {
Log.e(TAG, e.getMessage());
}
return verName;
}

private boolean getServerVer () {
try {
String verjson = NetworkTool.getContent(Config.UPDATE_SERVER + Config.UPDATE_VERJSON);
JSONArray array = new JSONArray(verjson);
if (array.length() > 0) {
JSONObject obj = array.getJSONObject(0);
try {
newVerCode = Integer.parseInt(obj.getString("verCode"));
newVerName = obj.getString("verName");
} catch (Exception e) {
newVerCode = -1;
newVerName = "";
return false;
}
}
} catch (Exception e) {
Log.e(TAG, e.getMessage());
return false;
}
return true;
}

if (getServerVerCode()) {
int vercode = Config.getVerCode(this); // 用到前面第一节写的方法
if (newVerCode > vercode) {
doNewVersionUpdate(); // 更新新版本
} else {
notNewVersionShow(); // 提示当前为最新版本
}
}

private void notNewVersionShow() {
int verCode = Config.getVerCode(this);
String verName = Config.getVerName(this);
StringBuffer sb = new StringBuffer();
sb.append("当前版本:");
sb.append(verName);
sb.append(" Code:");
sb.append(verCode);
sb.append(",\n已是最新版,无需更新!");
Dialog dialog = new AlertDialog.Builder(Update.this).setTitle("软件更新")
.setMessage(sb.toString())// 设置内容
.setPositiveButton("确定",// 设置确定按钮
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
finish();
}
}).create();// 创建
// 显示对话框
dialog.show();
}
private void doNewVersionUpdate() {
int verCode = Config.getVerCode(this);
String verName = Config.getVerName(this);
StringBuffer sb = new StringBuffer();
sb.append("当前版本:");
sb.append(verName);
sb.append(" Code:");
sb.append(verCode);
sb.append(", 发现新版本:");
sb.append(newVerName);
sb.append(" Code:");
sb.append(newVerCode);
sb.append(", 是否更新?");
Dialog dialog = new AlertDialog.Builder(Update.this)
.setTitle("软件更新")
.setMessage(sb.toString())
// 设置内容
.setPositiveButton("更新",// 设置确定按钮
new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,
int which) {
pBar = new ProgressDialog(Update.this);
pBar.setTitle("正在下载");
pBar.setMessage("请稍候...");
pBar.setProgressStyle(ProgressDialog.STYLE_SPINNER);
downFile(Config.UPDATE_SERVER + Config.UPDATE_APKNAME);
}
})
.setNegativeButton("暂不更新",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
// 点击"取消"按钮之后退出程序
finish();
}
}).create();// 创建
// 显示对话框
dialog.show();
}

void downFile(final String url) {
pBar.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();
InputStream is = entity.getContent();
FileOutputStream fileOutputStream = null;
if (is != null) {
File file = new File(
Environment.getExternalStorageDirectory(),
Config.UPDATE_SAVENAME);
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) {
}
}
}
fileOutputStream.flush();
if (fileOutputStream != null) {
fileOutputStream.close();
}
down();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();
}

void down() {
handler.post(new Runnable() {
public void run() {
pBar.cancel();
update();
}
});
}

void update() {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(Environment
.getExternalStorageDirectory(), Config.UPDATE_SAVENAME)),
"application/vnd.android.package-archive");
startActivity(intent);
}