步骤:
1.检测当前版本的信息AndroidManifest.xml–>manifest–>[Android]
2.从服务器获取版本号(版本号存在于xml文件中)并与当前检测到的版本进行匹配,如果不匹配,提示用户进行升级,如果匹配则进入程序主界面。(demo中假设需要更新)
3.当提示用户进行版本升级时,如果用户点击了“更新”,系统将自动从服务器上下载安装包并进行自动升级,如果点击取消将进入程序主界面。
效果图如下:
下面介绍一下代码的实现:
1.获取应用的当前版本号,我是封装了一个工具类来获取
// 获取本版本号,是否更新
int vision = Tools.getVersion(this);
获取当前版本号工具类:
public class Tools {
/**
* 检查是否存在SDCard
*
* @return
*/
public static boolean hasSdcard() {
String state = Environment.getExternalStorageState();
if (state.equals(Environment.MEDIA_MOUNTED)) {
return true;
} else {
return false;
}
}
/**
* 2 * 获取版本号 3 * @return 当前应用的版本号 4
*/
public static int getVersion(Context context) {
try {
PackageManager manager = context.getPackageManager();
PackageInfo info = manager.getPackageInfo(context.getPackageName(),
0);
String version = info.versionName;
int versioncode = info.versionCode;
return versioncode;
} catch (Exception e) {
e.printStackTrace();
}
return 0;
}
}
2.获取服务器版本号,是否要更新(此处就是简单的网络请求拿到需要的数据即可,我是写了固定值)
// 获取更新版本号
private void getVersion(final int vision) {
// {"data":{"content":"其他bug修复。","id":"2","api_key":"android",
// // "version":"2.1"},"msg":"获取成功","status":1}
String data = "";
//网络请求获取当前版本号和下载链接
//实际操作是从服务器获取
//demo写死了
String newversion = "2.1";//更新新的版本号
String content = "\n" +
"就不告诉你我们更新了什么-。-\n" +
"\n" +
"----------万能的分割线-----------\n" +
"\n" +
"(ㄒoㄒ) 被老板打了一顿,还是来告诉你吧:\n" +
"1.下架商品误买了?恩。。。我搞了点小动作就不会出现了\n" +
"2.侧边栏、弹框优化 —— 这个你自己去探索吧,总得留点悬念嘛-。-\n";//更新内容
String url = "http://openbox.mobilem.360.cn/index/d/sid/3429345";//安装包下载地址
double newversioncode = Double
.parseDouble(newversion);
int cc = (int) (newversioncode);
System.out.println(newversion + "v" + vision + ",,"
+ cc);
if (cc != vision) {
if (vision < cc) {
System.out.println(newversion + "v"
+ vision);
// 版本号不同
ShowDialog(vision, newversion, content, url);
}
}
}
3.接下来就是下载文件了
(1) 显示下载
此处用的是自定义按钮:
/**
* 升级系统
*
* @param content
* @param url
*/
private void ShowDialog(int vision, String newversion, String content,
final String url) {
final MaterialDialog dialog = new MaterialDialog(this);
dialog.content(content).btnText("取消", "更新").title("版本更新 ")
.titleTextSize(15f).show();
dialog.setCanceledOnTouchOutside(false);
dialog.setOnBtnClickL(new OnBtnClickL() {// left btn click listener
@Override
public void onBtnClick() {
dialog.dismiss();
}
}, new OnBtnClickL() {// right btn click listener
@Override
public void onBtnClick() {
dialog.dismiss();
// pBar = new ProgressDialog(MainActivity.this,
// R.style.dialog);
pBar = new CommonProgressDialog(MainActivity.this);
pBar.setCanceledOnTouchOutside(false);
pBar.setTitle("正在下载");
pBar.setCustomTitle(LayoutInflater.from(
MainActivity.this).inflate(
R.layout.title_dialog, null));
pBar.setMessage("正在下载");
pBar.setIndeterminate(true);
pBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pBar.setCancelable(true);
// downFile(URLData.DOWNLOAD_URL);
final DownloadTask downloadTask = new DownloadTask(
MainActivity.this);
downloadTask.execute(url);
pBar.setOnCancelListener(new DialogInterface.OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
downloadTask.cancel(true);
}
});
}
});
}
原生的按钮:
new android.app.AlertDialog.Builder(this)
.setTitle("版本更新")
.setMessage(content)
.setPositiveButton("更新", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
pBar = new CommonProgressDialog(MainActivity.this);
pBar.setCanceledOnTouchOutside(false);
pBar.setTitle("正在下载");
pBar.setCustomTitle(LayoutInflater.from(
MainActivity.this).inflate(
R.layout.title_dialog, null));
pBar.setMessage("正在下载");
pBar.setIndeterminate(true);
pBar.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pBar.setCancelable(true);
// downFile(URLData.DOWNLOAD_URL);
final DownloadTask downloadTask = new DownloadTask(
MainActivity.this);
downloadTask.execute(url);
pBar.setOnCancelListener(new DialogInterface.OnCancelListener() {
@Override
public void onCancel(DialogInterface dialog) {
downloadTask.cancel(true);
}
});
}
})
.setNegativeButton("取消", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
})
.show();
(2)通过异步任务实现进度++
/**
* 下载应用
*
* @author Administrator
*/
class DownloadTask extends AsyncTask<String, Integer, String> {
private Context context;
private PowerManager.WakeLock mWakeLock;
public DownloadTask(Context context) {
this.context = context;
}
@Override
protected String doInBackground(String... sUrl) {
InputStream input = null;
OutputStream output = null;
HttpURLConnection connection = null;
File file = null;
try {
URL url = new URL(sUrl[0]);
connection = (HttpURLConnection) url.openConnection();
connection.connect();
// expect HTTP 200 OK, so we don't mistakenly save error
// report
// instead of the file
if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
return "Server returned HTTP "
+ connection.getResponseCode() + " "
+ connection.getResponseMessage();
}
// this will be useful to display download percentage
// might be -1: server did not report the length
int fileLength = connection.getContentLength();
if (Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED)) {
file = new File(Environment.getExternalStorageDirectory(),
DOWNLOAD_NAME);
if (!file.exists()) {
// 判断父文件夹是否存在
if (!file.getParentFile().exists()) {
file.getParentFile().mkdirs();
}
}
} else {
Toast.makeText(MainActivity.this, "sd卡未挂载",
Toast.LENGTH_LONG).show();
}
input = connection.getInputStream();
output = new FileOutputStream(file);
byte data[] = new byte[4096];
long total = 0;
int count;
while ((count = input.read(data)) != -1) {
// allow canceling with back button
if (isCancelled()) {
input.close();
return null;
}
total += count;
// publishing the progress....
if (fileLength > 0) // only if total length is known
publishProgress((int) (total * 100 / fileLength));
output.write(data, 0, count);
}
} catch (Exception e) {
System.out.println(e.toString());
return e.toString();
} finally {
try {
if (output != null)
output.close();
if (input != null)
input.close();
} catch (IOException ignored) {
}
if (connection != null)
connection.disconnect();
}
return null;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
// take CPU lock to prevent CPU from going off if the user
// presses the power button during download
PowerManager pm = (PowerManager) context
.getSystemService(Context.POWER_SERVICE);
mWakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK,
getClass().getName());
mWakeLock.acquire();
pBar.show();
}
@Override
protected void onProgressUpdate(Integer... progress) {
super.onProgressUpdate(progress);
// if we get here, length is known, now set indeterminate to false
pBar.setIndeterminate(false);
pBar.setMax(100);
pBar.setProgress(progress[0]);
}
@Override
protected void onPostExecute(String result) {
mWakeLock.release();
pBar.dismiss();
if (result != null) {
// // 申请多个权限。大神的界面
// AndPermission.with(MainActivity.this)
// .requestCode(REQUEST_CODE_PERMISSION_OTHER)
// .permission(Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE)
// // rationale作用是:用户拒绝一次权限,再次申请时先征求用户同意,再打开授权对话框,避免用户勾选不再提示。
// .rationale(new RationaleListener() {
// @Override
// public void showRequestPermissionRationale(int requestCode, Rationale rationale) {
// // 这里的对话框可以自定义,只要调用rationale.resume()就可以继续申请。
// AndPermission.rationaleDialog(MainActivity.this, rationale).show();
// }
// }
// )
// .send();
// 申请多个权限。
AndPermission.with(MainActivity.this)
.requestCode(REQUEST_CODE_PERMISSION_SD)
.permission(Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.READ_EXTERNAL_STORAGE)
// rationale作用是:用户拒绝一次权限,再次申请时先征求用户同意,再打开授权对话框,避免用户勾选不再提示。
.rationale(rationaleListener
)
.send();
Toast.makeText(context, "您未打开SD卡权限" + result, Toast.LENGTH_LONG).show();
} else {
// Toast.makeText(context, "File downloaded",
// Toast.LENGTH_SHORT)
// .show();
update();
}
}
}
此处下载apk文件,需要获取SD的读写权限(用的是严大的权限库)
权限库GitHub
private static final int REQUEST_CODE_PERMISSION_SD = 101;
private static final int REQUEST_CODE_SETTING = 300;
private RationaleListener rationaleListener = new RationaleListener() {
@Override
public void showRequestPermissionRationale(int requestCode, final Rationale rationale) {
// 这里使用自定义对话框,如果不想自定义,用AndPermission默认对话框:
// AndPermission.rationaleDialog(Context, Rationale).show();
// 自定义对话框。
AlertDialog.build(MainActivity.this)
.setTitle(R.string.title_dialog)
.setMessage(R.string.message_permission_rationale)
.setPositiveButton(R.string.btn_dialog_yes_permission, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
rationale.resume();
}
})
.setNegativeButton(R.string.btn_dialog_no_permission, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
rationale.cancel();
}
})
.show();
}
};
//----------------------------------SD权限----------------------------------//
@PermissionYes(REQUEST_CODE_PERMISSION_SD)
private void getMultiYes(List<String> grantedPermissions) {
Toast.makeText(this, R.string.message_post_succeed, Toast.LENGTH_SHORT).show();
}
@PermissionNo(REQUEST_CODE_PERMISSION_SD)
private void getMultiNo(List<String> deniedPermissions) {
Toast.makeText(this, R.string.message_post_failed, Toast.LENGTH_SHORT).show();
// 用户否勾选了不再提示并且拒绝了权限,那么提示用户到设置中授权。
if (AndPermission.hasAlwaysDeniedPermission(this, deniedPermissions)) {
AndPermission.defaultSettingDialog(this, REQUEST_CODE_SETTING)
.setTitle(R.string.title_dialog)
.setMessage(R.string.message_permission_failed)
.setPositiveButton(R.string.btn_dialog_yes_permission)
.setNegativeButton(R.string.btn_dialog_no_permission, null)
.show();
// 更多自定dialog,请看上面。
}
}
//----------------------------------权限回调处理----------------------------------//
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[]
grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
/**
* 转给AndPermission分析结果。
*
* @param object 要接受结果的Activity、Fragment。
* @param requestCode 请求码。
* @param permissions 权限数组,一个或者多个。
* @param grantResults 请求结果。
*/
AndPermission.onRequestPermissionsResult(this, requestCode, permissions, grantResults);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
switch (requestCode) {
case REQUEST_CODE_SETTING: {
Toast.makeText(this, R.string.message_setting_back, Toast.LENGTH_LONG).show();
//设置成功,再次请求更新
getVersion(Tools.getVersion(MainActivity.this));
break;
}
}
}
(3) 当apk文件下载完毕时,打开安装
private void update() {
//安装应用
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(Environment
.getExternalStorageDirectory(), DOWNLOAD_NAME)),
"application/vnd.android.package-archive");
startActivity(intent);
}
源码
此demo已经上传到GitHub,如有需要自行下载
GitHub: 链接地址
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