从 Edittext 保存最新文本并在 onDestroy 之后恢复它

Question

对于我的名言创作者应用程序，如果用户在应用程序中写了一段文字，然后不小心关闭了应用程序并再次启动，那么所有文本都会消失。我当然想阻止这种情况，我已经尝试了一个没有成功的通用解决方案：

这就是我到目前为止所做的。我已经删除了不相关的代码。

public static EditText mEditText;
private String savedText;
private static final String SAVED_TEXT_KEY = "";

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putString(SAVED_TEXT_KEY, mEditText.getText().toString());
    savedText = SAVED_TEXT_KEY;

}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);

    mEditText.setText(SAVED_TEXT_KEY);
    String myString = savedInstanceState.getString(SAVED_TEXT_KEY);
}

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    mEditText = (EditText) findViewById(R.id.edittext);
    mEditText.setTypeface(Style.getTypeface(this, Style.SERIF));
    savedText = mEditText.getText().toString();
    mEditText.setText(SAVED_TEXT_KEY);



    if(savedInstanceState !=null){

        savedText = savedInstanceState.getString(SAVED_TEXT_KEY);

    }
}

Answer 1

如果我没看错，那么你就不要再在 textview 上设置文本了。

@Override
public void onSaveInstanceState(Bundle outState) {
  outState.putString(SAVED_TEXT_KEY, mEditText.getText().toString());
  super.onSaveInstanceState(outState);
}

public void onRestoreInstanceState(Bundle savedInstanceState) {
  super.onRestoreInstanceState(savedInstanceState);
  mEditText.setText(savedInstanceState.getString(SAVED_TEXT_KEY));
}

@Override
public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);

  mEditText = (EditText) findViewById(R.id.edittext);
  mEditText.setTypeface(Style.getTypeface(this, Style.SERIF));
  if (savedInstanceState != null) {
    mEditText.setText(savedInstanceState.getString(SAVED_TEXT_KEY));
  }
}

这应该可以解决问题。

Answer 2

首先，您应该为 SAVED_KEY_TEXT.

提供一个正确的密钥，而不是一个空字符串

private static final String SAVED_TEXT_KEY = "some_key";

然后，您应该将您的 onCreate 更新为：

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);


    mEditText = (EditText) findViewById(R.id.edittext);
    mEditText.setTypeface(Style.getTypeface(this, Style.SERIF));

    if(savedInstanceState !=null){
        mEditText.setText(savedInstanceState.getString(SAVED_TEXT_KEY));
    }
}

你的 onRestoreInstanceState 是这样的：

public void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);

    mEditText.setText(savedInstanceState.getString(SAVED_TEXT_KEY));
}

最后你的 onSaveInstanceState 是这样的：

public void onSaveInstanceState(Bundle outState) {
    outState.putString(SAVED_TEXT_KEY, mEditText.getText().toString());
    super.onSaveInstanceState(outState);
}

Answer 3

试试这个：

通过覆盖此保存您的状态：

@Override
protected void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putString(KEY, mEditText.getText().toString());
}

并恢复它：

public void onCreate(Bundle savedInstanceState) {
    if(savedInstanceState != null)
    {
        mEditText.setText(savedInstanceState.getString(KEY));
    }
}

Answer 4

public EditText mEditText;
private static final String SAVED_TEXT_KEY = "SAVED_TEXT_KEY";
private SharedPreferences prefs;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mEditText = (EditText) findViewById(R.id.editText);
    prefs = PreferenceManager.getDefaultSharedPreferences(this);
    mEditText.setText(prefs.getString(SAVED_TEXT_KEY,""));
}

@Override
public void onSaveInstanceState(Bundle outState) {
    super.onSaveInstanceState(outState);
    outState.putString(SAVED_TEXT_KEY, mEditText.getText().toString());
}

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
    super.onRestoreInstanceState(savedInstanceState);
    mEditText.setText(savedInstanceState.getString(SAVED_TEXT_KEY));
}

@Override
public void onDestroy() {
    super.onDestroy();
    SharedPreferences.Editor editor = prefs.edit();
    editor.putString(SAVED_TEXT_KEY,mEditText.getText().toString());
    editor.commit();
}

Answer 5

使用 IcePick 库：https://github.com/frankiesardo/icepick

@State 字符串用户名； // 这将自动保存和恢复

Answer 6

看来是我处理这个问题的方法不对。根据建议，我使用 SharedPreferences 来保存当前文本。

   public static final String LAST_TEXT = "";

    final SharedPreferences pref = PreferenceManager.getDefaultSharedPreferences(this);
    mEditText.setText(pref.getString(LAST_TEXT, ""));
    mEditText.addTextChangedListener(new TextWatcher() {
        @Override
        public void beforeTextChanged(CharSequence s, int start, int count, int after) {

        }

        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {

        }

        @Override
        public void afterTextChanged(Editable s) {

            pref.edit().putString(LAST_TEXT, s.toString()).commit();


        }
    });

从 Edittext 保存最新文本并在 onDestroy 之后恢复它

Save latest text from Edittext and restore it after onDestroy

android

state

android-edittext