將EditText保存到Android Studio中的ArrayList-編輯1

Question

我試圖從EditText字段中獲取輸入文本，保存String ，然后將其添加/保存到另一個Java class擁有的ArrayList中。 （我的MainActivity顯示了我存儲在ArrayList中的所有facts ，這是可行的。）但是，從EditText向ArrayList添加新的String不起作用。

謝謝您的幫助！

1. FactBook.java

     public class FactBook { public ArrayList<String> mFacts = new ArrayList<String>(Arrays.asList( "Quote 1", "Quote 2")); public String getFact() { String fact = ""; Random randomGenerator = new Random(); int randomNumber = randomGenerator.nextInt(mFacts.size()); fact = mFacts.get(randomNumber); return fact; } public void addFact(String thought) { mFacts.add(thought); }; 

2. InputActivity.java

     public class InputActivity extends AppCompatActivity { private Button mSaveButton; private EditText mTextThought; private FactBook mFactBook = new FactBook(); @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_input); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); setSupportActionBar(toolbar); mSaveButton = (Button) findViewById(R.id.saveButton); mTextThought = (EditText) findViewById(R.id.thoughtText); View.OnClickListener click = new View.OnClickListener() { @Override public void onClick(View view) { String thought = mTextThought.getText().toString().trim(); mFactBook.addFact(thought); Toast.makeText(InputActivity.this, "Your thought has been added!!", Toast.LENGTH_LONG).show(); mTextThought.setText(""); } }; mSaveButton.setOnClickListener(click); } } 

Answer 1

我認為您的代碼有問題。 addFact代碼不應該是這樣的：

public void addFact(String thought) {
        mFacts.addFact(thought);
};

Answer 2

public void addFact(String thought) {
    this.addFact(thought);

也許您應該像這樣更改代碼：

public void addFact(String thought) {
    mFacts.addFact(thought);}

Answer 3

您的addFact方法應該是，

 public void addFact(String thought) {
     this.mFacts.add(thought);
 }