如何在Android 4.2.2及以上版本中编程清除应用程序缓存

Question

在Android4.0中，我使用这个解决方案来清除我的应用程序缓存，它工作得很好：

public void clearApplicationData()
{
    File cache = getCacheDir();
    File appDir = new File(cache.getParent());
    if (appDir.exists()) {
        String[] children = appDir.list();
        for (String s : children) {
            if (!s.equals("lib")) {
                deleteDir(new File(appDir, s));
            }
        }
    }
}

public static boolean deleteDir(File dir)
{
    if (dir != null && dir.isDirectory()) {
        String[] children = dir.list();
        for (int i = 0; i < children.length; i++) {
            boolean success = deleteDir(new File(dir, children[i]));
            if (!success) {
                return false;
            }
        }
    }
    return dir.delete();
}

我对谷歌地图缓存清除感兴趣，上面写的解决方案适合我在Android 4.0中工作，但不适合Android 4.2.2。如有任何帮助，不胜感激。

我在logcat中没有任何错误。设备：三星Galaxy Tab 2 7.0'

Answer 1

PackageManager  pm = getPackageManager();
     // Get all methods on the PackageManager
Method[] methods = pm.getClass().getDeclaredMethods();
for (Method m : methods) {
    if (m.getName().equals("freeStorage")) {
        try {
            long desiredFreeStorage = 8 * 1024 * 1024 * 1024; 
            m.invoke(pm, desiredFreeStorage , null);
        } catch (Exception e) {
           // Method invocation failed. Could be a permission problem
        }
        break;
    }
}