android开发getcachedir空指针怎么回事
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解决时间 2021-04-12 18:21
- 提问者网友：wodetian
- 2021-04-12 08:25
android开发getcachedir空指针怎么回事
最佳答案
- 五星知识达人网友：千杯敬自由
- 2021-04-12 09:34
咱想以编程方式清除咱的应用程序数据。但得到 NullPointerEXception 用下面的代码。
这里是咱的代码:-
public class MyApplication extends Application {
private static MyApplication instance;
@Override
public void onCreate() {
super.onCreate();
instance = this;
}
public static MyApplication getInstance(){
return instance;
}
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));
Log.i("TAG", "**************** File /data/data/APP_PACKAGE/" + s +" DELETED *******************");
}
这里是咱的代码:-
public class MyApplication extends Application {
private static MyApplication instance;
@Override
public void onCreate() {
super.onCreate();
instance = this;
}
public static MyApplication getInstance(){
return instance;
}
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));
Log.i("TAG", "**************** File /data/data/APP_PACKAGE/" + s +" DELETED *******************");
}
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