Android 版本升级

在应用中, 版本升级是每个应用都需要做的功能, 下面介绍下主要代码.首先每次进入应用判断版本号与后台设置是否一致, 不一致即提示用户升级更新.为适配Android6.0加入运行时权限. 添加代码

    if (ContextCompat.checkSelfPermission(MainActivity.this,                                Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {                            ActivityCompat.requestPermissions(MainActivity.this,                                    new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 100);                        } else {                        //这里表示以允许写入权限,                          //这里写下载apk的代码                        }

如果检测为开通权限, 则会出提示框提示开通, 回调的代码

 @Override    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {        super.onRequestPermissionsResult(requestCode, permissions, grantResults);        if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {          //这里写下载apk的代码        }    }

下面是如何下载apk

private NotificationManager notificationManager;private Notification notification;RemoteViews view = null;private void downloadApk(final String url) {        new EasyLocalTask<Void, File>() {            @Override            protected File doInBackground(Void... params) {                File file = new File(CheLiWangApp.CACHE_ROOT_CACHE_DIR + File.separator + CheLiWangConfig.APK_NAME);                try {                    LogUtil.e(url);                    notification();                    HttpUtil.downloadFile(url, file, new HttpUtil.IDownloadCallback() {                        int i = 0;                        @Override                        public void onProgress(long currentSize, long totalSize) {                            progress = (int) (((float) currentSize / totalSize) * 100);                            if ((int) (progress / 10) > i) {                                i = (int) (progress / 10);                                // 更改进度条                                notification.contentView.setProgressBar(R.id.progress, (int) (totalSize / 1024 / 1000),                                        (int) (currentSize / 1024 / 1000), false);                                // 发送消息                                notificationManager.notify(101, notification);                            }                        }                    });                    // HttpUtil.downloadFile(url, file);                } catch (IOException e) {                    file = null;                }                return file;            }            @Override            protected void onPostExecute(File result) {                super.onPostExecute(result);                if (result != null) {                    notificationManager.cancel(101);// notification关闭不显示                    install(MainActivity.this, result);                }            }        }.execute();    } private void notification() {      notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);      notification = new Notification(R.drawable.ic_launcher, "下载新版本", System.currentTimeMillis());        if (view == null) {            view = new RemoteViews(getPackageName(), R.layout.notification);            notification.contentView = view;            notification.contentView.setProgressBar(R.id.progress, 100, 0, false);        }        PendingIntent contentIntent = PendingIntent.getActivity(this, R.string.app_name, new Intent(),                PendingIntent.FLAG_UPDATE_CURRENT);        notification.contentIntent = contentIntent;        notification.flags |= Notification.FLAG_ONGOING_EVENT;// 滑动或者clear都不会清空        notificationManager.notify(101, notification);    }

下面是安装apk的代码, 适配Android7.0, 解决7.0安装下载好的apk闪退bug
首先需在manifest中application 中加上

<provider            android:name="android.support.v4.content.FileProvider"            android:authorities="com.clwapp.test.fileprovider"            android:grantUriPermissions="true"            android:exported="false">            <!--元数据-->            <meta-data                android:name="android.support.FILE_PROVIDER_PATHS"                android:resource="@xml/file_paths" />        </provider>

并在res目录下新建文件夹xml文件夹, 创建file_paths.xml文件
写入代码

<?xml version="1.0" encoding="utf-8"?><resources>    <paths>        <external-path            name="download"            path=""/>    </paths></resources>

在MainActivity 中调用安装方法

public void install(Context context, File file) {        Intent intent = new Intent(Intent.ACTION_VIEW);        // 由于没有在Activity环境下启动Activity,设置下面的标签        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);        if (Build.VERSION.SDK_INT >= 24) { //判读版本是否在7.0以上            //参数1 上下文, 参数2 Provider主机地址 和配置文件中保持一致   参数3  共享的文件            Uri apkUri =                    FileProvider.getUriForFile(context, "com.clwapp.test.fileprovider", file);            //添加这一句表示对目标应用临时授权该Uri所代表的文件            intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);            intent.setDataAndType(apkUri, "application/vnd.android.package-archive");        } else {            intent.setDataAndType(Uri.fromFile(file),                    "application/vnd.android.package-archive");        }        context.startActivity(intent);    }