Question

我制作的游戏将允许用户选择不同的类型，在MainActivity中将有一个警报对话框供用户选择。有2个元素（speed_1和speed_2）是影响GameActivity难度的数字

我希望如果用户检查＆＃34; Easy＆＃34;在警报对话框中，speed_1和speed_2将更改为1（在GameActivity中）

如果用户检查＆＃34;困难＆＃34;在警报对话框中，speed_1和speed_2将更改为3（在GameActivity中）

谢谢！

void generateLevelListDialog() {
    // Instantiate an AlertDialog.Builder with its constructor
    AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);

    // Specify the list in the dialog using the array
    builder.setTitle("Difficulty").setItems(R.array.levels_array,
            new DialogInterface.OnClickListener() {
                // Chain together various setter methods to set the list
                // items
                // The index of the item selected is passed by the parameter
                // which
                public void onClick(DialogInterface dialog, int which) {
                    //switch to game activity
                    Intent gameIntent = new Intent(MainActivity.this, GameActivity.class);
                    //change ball speed and racket length
                    switch (which) {
                        case 0:

                            break;

                        case 1:
                            break;

                        case 2:
                            break;

                        default:
                            break;
                    }
                    //start activity
                    startActivity(gameIntent);

                }
            });
    //create and show list dialog
    AlertDialog dialog = builder.create();
    dialog.show();
}

Answer 1

通常，您有两种选择：

1）将所选值保存到首选项中，稍后在GameActivity：

中阅读

SharedPreferences preferences = PreferenceManager.getDefaultSharedPreferences(this);

写入MainActivity

preferences.edit().putInt("speed_1", speed_1).apply();

阅读GameActivity

int speed_1 = preferences.getInt("speed_1", 0);

作为下次用户玩游戏时的奖励，它将使用之前选择的难度级别。

2）使用附加内容通过GameActivity将难度等级值（speed_1..speed_3）传递给gameIntent：

写入MainActivity

Intent gameIntent = new Intent(MainActivity.this, GameActivity.class);
gameIntent.putExtra("speed_1", speed_1);

阅读GameActivity

Bundle extras = getIntent().getExtras();
String speed_1 = extras.getInt("speed_1");

Answer 2

您可以使用Intent传递值，如下所示

int level;

Intent intent = new Intent(MainActivity.this, GameActivity.class);
          switch (which) {
                    case 0:
                        level = 1;
                        break;
                    case 1:
                        level = 2;
                        break;
                    case 2:
                        level = 3;
                        break;
                    default:
                        level = 1;      // Default Value
                        break;
                }

intent.putExtra("DIFFICULTY_LEVEL", level);
startActivity(intent);

在GameActivity.java中，您可以简单地获得如下所示的值

int level = getIntent().getIntExtra()("DIFFICULTY_LEVEL", 1); // where '1' is default value

谢谢！

将数据更改为其他活动

2 个答案: