从应用程序退出后，用户定义的按钮重命名不起作用

Question

//这是我重命名按钮的方法，但退出后它不起作用意味着它没有显示用户重命名的原因？

void changeNameOne(){
    newNmOne ="";
    lidOne=btn.getText().toString();
    AlertDialog.Builder alert = new AlertDialog.Builder(this);
    alert.setTitle("Change Name");
    alert.setMessage("Type in the text you want to set.");
    final EditText ec = new EditText(this);
    alert.setView(ec);
    ec.setText(lidOne);
    alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            newNmOne = ec.getText().toString();
            btn.setText(newNmOne);
        }
    });
    alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            btn.setText(lidOne);
        }

    });
    alert.show();
}

Answer 1

尝试以下更改：

private static final String MYKEY = "myEditText1";
private static final String DEFAULT_TEXT = "I'm a button";

private String newNmOne = DEFAULT_TEXT;

void changeNameOne(){
        lidOne=btn.getText().toString();
        AlertDialog.Builder alert = new AlertDialog.Builder(this);
        alert.setTitle("Change Name");
        alert.setMessage("Type in the text you want to set.");
        final EditText ec = new EditText(this);
        alert.setView(ec);
        ec.setText(lidOne);
        alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                newNmOne = ec.getText().toString();
                btn.setText(newNmOne);
                prefs.putString(MYKEY, newNmOne);////////////here this can be done in onpause too
            }
        });
        alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                btn.setText(lidOne); //not needed
            }

        });
        alert.show();
    }

    public void onResume(){
         newNmOne = prefs.getString(MYKEY, DEFAULT_TEXT);//if not found set default text
    btn.setText(newNmOne);
    }

根据您的需求进行调整

Answer 2

如果您需要在app退出后保留文本，请使用SharedPreferences。请参阅https://developer.android.com/training/basics/data-storage/shared-preferences.html。