请问andorid为何我用删除文件的代码删不掉
我设置的权限:
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
---------------------------------
我删除的代码
import package java.io;
File f = new File(path); // 输入要删除的文件位置
if(f.exists()) {
if(f.delete())
{
System.out.println("删除成功");
}
else {
System.out.println("删除失败");
}
}
-------------------------------
包括这方法也不好用
file.createNewFile()
---------------------------------
删除文件的代码不抛出异常,直接返回false;
file.createNewFile()代码直接抛出异常
--------
异常如下:
08-17 15:31:12.052 13234-13234/phoneinfoupdate.com.phoneinfoupdate E/AndroidRuntime: FATAL EXCEPTION: main
Process: phoneinfoupdate.com.phoneinfoupdate, PID: 13234
java.lang.IllegalStateException: Could not execute method for android:onClick
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:4438)
at android.view.View$PerformClick.run(View.java:18422)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5001)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:785)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:601)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.io.IOException: open failed: EACCES (Permission denied)
at java.io.File.createNewFile(File.java:946)
百度了好久,感觉已经绝望了,求大神指教..
我删除的目录是/data/local/tmp/123.txt 没有root手机是小米2s,测了google手机也不行.