如何在Marshmallow中以编程方式清除应用程序缓存

Question

我想在Android Marshmallow 6.0中以编程方式清除我的应用程序缓存。我尝试了下面的代码，但是它在Marshmallow中不起作用。我读了堆栈溢出，代码从API级别19弃用。我在我的Manifests.xml中添加了CLEAR_APP_CACHE权限

 public  void trimCache(Context context) {
        try {
            File dir = context.getCacheDir();
            if (dir != null && dir.isDirectory()) {
                deleteDir(dir);
            }
        } catch (Exception e) {
            // TODO: handle exception
        }
    }

 public  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;
                }
            }
        }

        // The directory is now empty so delete it
        return dir.delete();
    }

Answer 1

在清单中添加以下权限：

<uses-permission android:name="android.permission.CLEAR_APP_CACHE" />

您还应该检查外部缓存目录。

public  void trimCache(Context context) {
        try {
            File dir = context.getCacheDir();
            if (dir != null && dir.isDirectory()) {
                deleteDir(dir);
            }
            File exDir = context.getExternalCacheDir();
            if (exDir != null && exDir.isDirectory()) {
                deleteDir(exDir);
            }
        } catch (Exception e) {
            // TODO: handle exception
        }
    }