我需要找到一种方法来清除我的应用程序存储在缓存中的数据。基本上我正在使用Fedor的(Lazy load of images in ListView)惰性列表实现,我想在我有例如100时自动清除缓存图片加载。任何想法如何做到这一点?
修改 代码:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
list=(ListView)findViewById(R.id.list);
adapter=new LazyAdapter(this, mStrings);
list.setAdapter(adapter);
deleteCache(this);
adapter.notifyDataSetChanged();
}
public static void deleteCache(Context context) {
try {
File dir = context.getCacheDir();
if (dir != null && dir.isDirectory()) {
deleteDir(dir);
}
} catch (Exception e) {}
}
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();
}
答案 0 :(得分:36)
这将删除缓存
public static void deleteCache(Context context) {
try {
File dir = context.getCacheDir();
if (dir != null && dir.isDirectory()) {
deleteDir(dir);
}
} catch (Exception e) {}
}
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();
}
答案 1 :(得分:4)
我希望这有助于你进一步发展
public static void trimCache(Context context) {
File dir = context.getCacheDir();
if(dir!= null && dir.isDirectory()){
File[] children = dir.listFiles();
if (children == null) {
// Either dir does not exist or is not a directory
} else {
File temp;
for (int i = 0; i < children.length; i++) {
temp = children[i];
temp.delete();
}
}
}
}
答案 2 :(得分:1)
您可以致电系统服务 clearApplicationUserData()(仅适用于&gt; = KitKat版本)
所以你可以检查版本,然后一切都会好起来的:) 这是代码:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
((ActivityManager) getActivity().getSystemService(Context.ACTIVITY_SERVICE))
.clearApplicationUserData();
}
答案 3 :(得分:0)
如果使用Apache Commons IO,您可以使用一行(不包括try-catch)来完成此任务:
getIntent().getStringExtra("notification_tag");
答案 4 :(得分:0)
使用 Kotlin,您只需调用
File(context.cacheDir.path).deleteRecursively()
结果与其他答案相同,但无需手动检查和循环
答案 5 :(得分:-3)
丢弃旧适配器并将listview附加到适配器的新实例(但listview将丢失滚动位置)。例如:
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
m_adapter = new MyAdapter(this);
final ListView listView = (ListView) getView()
.findViewById(R.id.my_list);
listView.setAdapter(m_adapter);
}
}