Question

在我的Android应用中，我需要请求在外部存储上写入的权限。从Android 6开始，您必须在运行时请求权限。

我的问题是，我不知道如何在请求权限后恢复我的原始任务，因为我的函数传递了一个参数（soundId），该参数在请求权限后“丢失”。请求权限时如何传递参数？

我的代码如下所示：

MainActivity.java

static final int REQ_CODE_EXTERNAL_STORAGE_PERMISSION = 45;

public static void sharesound(int soundId, final Context context){
if (ActivityCompat.checkSelfPermission(context,    Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED)
{
  CopyRAWtoSDCard(soundId, soundpath,context);
} 

else 
{
  ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQ_CODE_EXTERNAL_STORAGE_PERMISSION);
}
}



@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    if (requestCode == REQ_CODE_EXTERNAL_STORAGE_PERMISSION && grantResults.length >0 && grantResults[0] == PackageManager.PERMISSION_GRANTED )
    {
      sharesound(soundId,getApplicationContext()); **I cannot access soundId from here !** 
    }
}

Answer 1

编辑：//这已经过时了，最好使用ContentProvider或Fileprovider，因为它们不需要任何权限！

我现在已经找到了解决方案：

首先，我们需要一个全局变量：

 int lastsharedsound;

然后，sharesound函数将最后一个共享声音保存到该变量中。

public static void sharesound(int soundId)
{
    lastsharedsound=soundId;
    if (ActivityCompat.checkSelfPermission(context,Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED)
    {
      CopyRAWtoSDCard(soundId, soundpath,context);
      ***do the intent sharing stuff here***
    } 

    else 
    {
      ActivityCompat.requestPermissions((Activity) context, new String[]{Manifest.permission.WRITE_EXTERNAL_STORAGE},     5);
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) 
{
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    if (requestCode == 5 && grantResults.length >0 && grantResults[0] == PackageManager.PERMISSION_GRANTED )
    {
       sharesound(lastsharedsound); ***Here we call our function again*** 
    }
}

Answer 2

public static void sharesound(int soundId, final Context context){
if (ActivityCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED)
{
  CopyRAWtoSDCard(soundId, soundpath,context);
} 

else 
{
  ActivityCompat.requestPermissions((Activity) context, new String[ {Manifest.permission.WRITE_EXTERNAL_STORAGE}, REQ_CODE_EXTERNAL_STORAGE_PERMISSION);
  if(ActivityCompat.checkSelfPermission(context, Manifest.permission.WRITE_EXTERNAL_STORAGE) == PackageManager.PERMISSION_GRANTED){
      sharesound(soundId, context);
  }
}
}

修改在再次调用方法之前，我添加了对权限的检查

Android：请求权限时传递参数（Android 6）

2 个答案: