I have the following code:
public static void requestPermissions(final Activity activity){
System.out.println("Permission 0 : " + activity.getPackageName());
int permission = activity.getPackageManager().checkPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE, activity.getPackageName());
if(permission != PackageManager.PERMISSION_GRANTED){
PackageManager pm = activity.getPackageManager();
try {
PackageInfo pi = pm.getPackageInfo(activity.getPackageName(), PackageManager.GET_ACTIVITIES);
System.out.println("Permission package info : " + pi);
} catch (NameNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("Permission 1 : " + activity);
ActivityCompat.requestPermissions(activity, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 0xFFEEDDCC);
}
}
无论我如何尝试,我总是得到以下结果:
10-19 17:35:31.642: I/System.out(27952): Permission 0 : com.example.testappandroid
10-19 17:35:31.643: I/System.out(27952): Permission package info : PackageInfo{7b81ba7 com.example.testappandroid}
10-19 17:35:31.643: I/System.out(27952): Permission 1 : com.example.testappandroid.MainActivity@c40298e
10-19 17:35:31.644: I/ActivityManager(862): START u0 {act=android.content.pm.action.REQUEST_PERMISSIONS pkg=com.google.android.packageinstaller cmp=com.google.android.packageinstaller/com.android.packageinstaller.permission.ui.GrantPermissionsActivity (has extras)} from uid 10109 on display 0
10-19 17:35:31.668: I/GrantPermissionsActivity(4527): No package: null
10-19 17:35:31.668: I/GrantPermissionsActivity(4527): android.content.pm.PackageManager$NameNotFoundException
10-19 17:35:31.668: I/GrantPermissionsActivity(4527): at android.app.ApplicationPackageManager.getPackageInfo(ApplicationPackageManager.java:137)
10-19 17:35:31.668: I/GrantPermissionsActivity(4527): at com.android.packageinstaller.permission.ui.GrantPermissionsActivity.getCallingPackageInfo(GrantPermissionsActivity.java:312)
10-19 17:35:31.668: I/GrantPermissionsActivity(4527): at com.android.packageinstaller.permission.ui.GrantPermissionsActivity.onCreate(GrantPermissionsActivity.java:94)
这可能是一个非常简单的问题。传递给requestPermissions函数的活动是主活动,如您从LogCat日志中可以看到的那样。PackageManager.getPackageInfo()的使用似乎也是正确的,因为如果我将其隔离,它会按预期工作。
此外,Manifest.permission.WRITE_EXTERNAL_STORAGE在清单文件中已定义,正如预期的那样。
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
编辑
一个重要的事实是,我的静态函数requestPermissions(Activity)定义在一个外部库中,例如叫做utils.jar。因此,如果我在MainActivity.java中编写以下内容:
protected void onStart(){
super.onStart();
final Activity act = this;
Utils.requestPermissions(act); // in utils.jar
}
它会失败。如果我写成这样:
protected void onStart(){
super.onStart();
final Activity act = this;
ActivityCompat.requestPermissions(act, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, 1);
}
如预期一样,它会请求权限。
编辑结束
有人之前遇到过这种情况并能提供一些信息吗?非常感谢。