1. 检查设备安全级别

在AndroidManifest.xml文件中添加以下权限：

使用以下代码检查设备的安全级别是否符合要求：

MediaDrm mediaDrm = new MediaDrm(WIDEVINE_UUID);
String securityLevel = mediaDrm.getPropertyString("securityLevel");
if (securityLevel.equals("L1")) {
    // Device is Widevine L1 certified
} else {
    // Device is NOT Widevine L1 certified
}

2. 检查设备是否处于compliant状态

使用以下代码检查设备是否处于compliant状态：

MediaDrm mediaDrm = new MediaDrm(WIDEVINE_UUID);
String provider = mediaDrm.getPropertyString("vendor");
if (provider.equals("widevine")) {
    String drmVersion = mediaDrm.getPropertyString("version");
    int level = Integer.parseInt(drmVersion.split("\\.")[0]);
    if (level >= 6) {
        String status = mediaDrm.getPropertyString("com.widevine.alpha.drm.info");
        if (status.contains("Compliant")) {
            // Device is compliant
        } else {
            // Device is NOT compliant
        }
    }
}

3. 检查是否安装了正确的Widevine CDM

使用以下代码检查设备是否安装了正确的Widevine CDM：

private boolean isWidevineCDMInstalled(Context context) {
    PackageManager manager = context.getPackageManager();
    List apps = manager.getInstalledApplications(PackageManager.GET_META_DATA);
    for (ApplicationInfo app : apps) {
        if (app.packageName.equals("com.google.android.exoplayer2.demo")) {
            try {
                PackageInfo packageInfo = manager.getPackageInfo(app.packageName, PackageManager.GET_ACTIVITIES);
                String path = packageInfo.applicationInfo.dataDir + "/widevine";
                File file = new File(path);
                if (file.exists()) {
                    // Widevine CDM is installed
                    return true;
                }
            } catch (PackageManager.NameNotFoundException e) {
                e.printStackTrace();
            }
        }
    }
    return false;
}

如果Widevine CDM未正确安装，请按照以下步骤解决问题：

1. 在app的build.gradle中添加以下依赖项：

implementation 'com.google.android.exoplayer:exoplayer-core:[version_number]'

2. 在设备上安装Widevine CDM

Default