java - 动态创建首选项

Question

我正在使用此代码获取特定应用程序所需的权限列表。我想为请求的每个权限创建一个首选项。我怎样才能做到这一点？代码是:

try {
        PackageInfo packageInfo = getPackageManager().getPackageInfo(myPackageName, PackageManager.GET_PERMISSIONS);

        String[] requestedPermissions = packageInfo.requestedPermissions;
        if ( requestedPermissions != null ) {
            for (int i = 0; i < requestedPermissions.length; i++) {
                permission.setSummary(requestedPermissions[i] + "\n");
            }

        }
    }
    catch ( PackageManager.NameNotFoundException e ) {
        e.printStackTrace();
    }

Answer 1

Mario 我想知道您要为什么创建带有应用权限名称的首选项，但在这里您有一个解决方案。

try { 
        PackageInfo packageInfo = getPackageManager().getPackageInfo(myPackageName, PackageManager.GET_PERMISSIONS);

        String[] requestedPermissions = packageInfo.requestedPermissions;
        if ( requestedPermissions != null ) {
            for (int i = 0; i < requestedPermissions.length; i++) {
              //permission.setSummary(requestedPermissions[i] + "\n");
              //method to create a preference with the name of your permission.  
              setPreference(this, requestedPermissions[i]);
            } 

        } 
    } 
    catch ( PackageManager.NameNotFoundException e ) {
        e.printStackTrace();
    } 

创建首选项的方法。

public static void setPreference(Context context, String preferenceName)
{
    SharedPreferences settings = context.getSharedPreferences(preferenceName, 0);
    SharedPreferences.Editor editor = settings.edit();
    //Add a key to this preference and his value.
    editor.putString(preferenceName+"_value", "Value stored in preference called: " + preferenceName);
    editor.commit();
}

创建一个方法来读取存储在您的首选项中的值

public static String getPreference(Context context,  String preferenceName){
            SharedPreferences settings = context.getSharedPreferences(preferenceName, 0);
            return settings.getString(preferenceName+"_value", "");
        }

然后你可以读取存储在你的首选项中的值，例如，读取存储在名为

的首选项中的值

"android.permission.INTERNET"

:

   Log.i("Preferences", getPreference(this,"android.permission.INTERNET"));

在 Toast 中显示数据的示例:

Toast.makeText(this, "the value stored in \"android.permission.INTERNET\" preference is: " + getPreference(this,"android.permission.INTERNET"), Toast.LENGTH_LONG).show();