如何以順序方式運行android函數？

Question

我想做一個android應用程序的權限（對於android 6.0及以上）要求在下一個活動被調用之前。但每次我嘗試，它會去下一個活動，並回去，我看到的權限被問到。有沒有辦法首先運行權限，只有一次結束後，才能進入下一個活動？

Answer 1

只有當授予權限時才啓動您的活動，否則請求權限。

if(Build.VERSION.SDK_INT>Build.VERSION_CODES.LOLLIPOP_MR1){ 
    // Use your own required permission here instead of WRITE_EXTERNAL_STORAGE 
    if(!(getActivity().checkSelfPermission("android.permission.WRITE_EXTERNAL_STORAGE") == PackageManager.PERMISSION_GRANTED)){ 
     // Permission not already granted, Asking for permission 
     String[] perms = {"android.permission.WRITE_EXTERNAL_STORAGE"}; 
     requestPermissions(perms, 200); 
    }else { 
     // Permission already granted, starting activity ... 
     Intent i = new Intent(getApplicationContext(), YourActivity.class); 
     startActivity(i); 
    } 
} 

onRequestPermissionsResult()在授權或拒絕來自用戶對話框的權限時被調用。當用戶從權限提示中選擇一個選項時，可以用它來處理事件。

/** 
Called when permission granted or denied 
*/ 
@Override 
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) { 
    super.onRequestPermissionsResult(requestCode, permissions, grantResults); 

    switch (requestCode){ 
     case 200:{ 
      if(grantResults[0] == PackageManager.PERMISSION_GRANTED){ 
       // Permission granted, starting activity ... 
       Intent i = new Intent(getApplicationContext(), YourActivity.class); 
       startActivity(i); 
      }else{ 
       Toast.makeText(ctx, "Permission Denied by user. Please grant access to continue.", Toast.LENGTH_SHORT).show(); 
      } 
     } 
    } 
}