Android 计算已安装应用的大小

一、方法一

// 获取PackageManager实例
PackageManager pm = context.getPackageManager();

try {
    // 获取ApplicationInfo
    ApplicationInfo appInfo = pm.getApplicationInfo(packageName, 0);
    
    // 获取应用大小（APK文件大小）
    long apkSize = new File(appInfo.sourceDir).length();
    
    // 获取数据大小（需要API 26+）
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        long dataSize = new File(appInfo.dataDir).length();
        long totalSize = apkSize + dataSize;
    }
    
} catch (PackageManager.NameNotFoundException e) {
    e.printStackTrace();
}

二、方法二

对于Android 8.0 (API 26)及以上版本，可以使用更精确的StorageStatsManager：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    StorageStatsManager storageStatsManager = 
        (StorageStatsManager) context.getSystemService(Context.STORAGE_STATS_SERVICE);
    
    try {
        StorageStats stats = storageStatsManager.queryStatsForUid(
            StorageManager.UUID_DEFAULT, 
            appInfo.uid
        );
        
        long appSize = stats.getAppBytes();
        long dataSize = stats.getDataBytes();
        long cacheSize = stats.getCacheBytes();
        long totalSize = appSize + dataSize + cacheSize;//单位byte
        
    } catch (IOException e) {
        e.printStackTrace();
    }
}

相关权限添加

<uses-permission android:name="android.permission.QUERY_ALL_PACKAGES" />
    <uses-permission android:name="android.permission.PACKAGE_USAGE_STATS"
        tools:ignore="ProtectedPermissions" />