1、获取版本号

public static int getVersionCode(Context context) {
        try {
            PackageManager manager = context.getPackageManager();
            PackageInfo info = manager.getPackageInfo(context.getPackageName(), 0);
            int versionCode = info.versionCode;
            return versionCode;
        } catch (Exception e) {
            return 0;
        }
    }

2、获取版本名称

public static String getVersionName(Context context) {
        try {
            PackageManager manager = context.getPackageManager();
            PackageInfo info = manager.getPackageInfo(context.getPackageName(), 0);
            String versionName = info.versionName;
            return versionName;
        } catch (Exception e) {
            return "未知";
        }
    }

3、检查app是否安装

public static boolean checkAppInstalled(Context context, String pkgName) {
        if (pkgName == null || pkgName.isEmpty()) {
            return false;
        }
        final PackageManager packageManager = context.getPackageManager();
        List<PackageInfo> info = packageManager.getInstalledPackages(0);
        if (info.isEmpty())
            return false;
        for (int i = 0; i < info.size(); i++) {
            if (pkgName.equals(info.get(i).packageName)) {
                return true;
            }
        }
        return false;
    }

4、打开app

public static void openApk(Context mContext,String packagename) {
  Intent intent = mContext.getPackageManager().getLaunchIntentForPackage(packagename);
    if (intent != null) {
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        mContext.startActivity(intent);
     }
  }

5、安装apk,首先要在AndroidManifest.xml中配置fileprovider

AndroidManifest.xml配置如下

 <provider
          android:name=".provider.MyFileProvider"
            android:authorities="${applicationId}.fileprovider"
            android:exported="false"
            android:grantUriPermissions="true">
            <meta-data
                android:name="android.support.FILE_PROVIDER_PATHS"
                android:resource="@xml/file_paths" />
  </provider>

MyFileProvider写法

public class MyFileProvider extends FileProvider {
}`

public static void installApk(Context mContext, File apkFile) {
    if (Build.VERSION.SDK_INT >= 24) {//判读版本是否在7.0以上
            Uri apkUri = FileProvider.getUriForFile(mContext, mContext.getPackageName() + ".fileprovider", apkFile);//在AndroidManifest中的android:authorities值
            Intent install = new Intent(Intent.ACTION_VIEW);
            install.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            install.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);//对目标应用临时授权该Uri所代表的文件
            install.setDataAndType(apkUri, "application/vnd.android.package-archive");
            mContext.startActivity(install);
        } else {
            Intent install = new Intent(Intent.ACTION_VIEW);
            install.setDataAndType(Uri.fromFile(apkFile), "application/vnd.android.package-archive");
            install.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
            mContext.startActivity(install);
        }
    }