java如何从一个活动访问另一个类的用户输入？

Question

在我的Android Studio项目中，我有一个名为ParticleActivity的活动

public class ParticleActivity extends AppCompatActivity  {

public final static String EXTRA_MESSAGE = "pso.algo.MESSAGE";
private ProgressDialog pd;
private double[] results = {-1.0, -1.0, -1.0};
EditText particles = (EditText) findViewById(R.id.particles);
EditText iterations = (EditText) findViewById(R.id.iterations);
static EditText solution;
public static double userSolution = Double.parseDouble(solution.getText().toString());
static EditText battery;
public static double batteryLevel = Double.parseDouble(battery.getText().toString());

声明了userSolution和batteryLevel，以便另一个类customUseCase可以访问这些字段中的用户输入

public class CustomUseCase extends Test {

public ArrayList<Double> costData = MainActivity.costDATA; //costs that the user enters for each resource
public ArrayList<Double> costWlan = MainActivity.costWLAN;
public ArrayList<Double> costUtilities = MainActivity.costUTILITY;
public double batteryCost = ParticleActivity.batteryLevel; //battery cost user enters
public double userSolution = ParticleActivity.userSolution; //user's predicted solution
private int maxIter;
private int noParticles;

我知道这不是一种编写代码的好方法，因为它在Android Studio上说我会出现内存泄漏，因为Android组件不应该声明为静态变量。但这是唯一的方法（从我对Android的一点了解来看），我可以考虑从ParticleActivity中的EditText字段访问用户输入，以便在我的customUseCase类中使用。有人能给我一个好方法我可以写出来吗？谢谢

Answer 1

我理解您试图将值传递给非活动，但意图不起作用。 为什么不使用共享首选项来存储和更新值呢

Setting values in Preference:

 // MY_PREFS_NAME - a static String variable like: 
 public static final String MY_PREFS_NAME = "MyPrefsFile";
 SharedPreferences.Editor editor = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE).edit();
 editor.putString("userSolution", "test");
 editor.putInt("batteryLevel", 12);
 editor.commit();

Retrieve data from preference:

 SharedPreferences prefs = getSharedPreferences(MY_PREFS_NAME, MODE_PRIVATE); 
 String name = prefs.getString("userSolution", null);//"null" is the default value.
 int idName = prefs.getInt("batteryLevel", 0); //0 is the default value.

Answer 2

尝试使用Intent类及其putExtra方法 看到这里的文档了吗 https://developer.android.com/reference/android/content/Intent.html

示例用法

Intent i = new Intent(ParticleActivity.this,CustomUseCase.class)
                     i.putExtra("myShow","one");

然后在你的CustomUseCase课程上

Intent i=getIntent();
String show=i.getStringExtra("myShow");