Question

我有activity_password_change.xml和PasswordChangeActivity。看起来像这样：

public class PasswordChangeActivity extends BaseActivity {

private AutoCompleteTextView mNiu;
private EditText mPassword;
private TextView mCurrentPassword;
private TextView mNewPassword;
private TextView mRepeatPassword;
private Button mChange;
private PasswordChangeViewModel mPasswordChangeViewModel;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_password_change);

    mNiu = (AutoCompleteTextView) findViewById(R.id.NIU);
    mPassword = (EditText) findViewById(R.id.password);
    mCurrentPassword = (TextView) findViewById(R.id.current_password);
    mNewPassword = (TextView) findViewById(R.id.new_password);
    mRepeatPassword = (TextView) findViewById(R.id.repeat_password);
    mChange = (Button) findViewById(R.id.Change);

    mPasswordChangeViewModel = ViewModelProviders.of(this).get(PasswordChangeViewModel.class);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);

    mChange.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            mPasswordChangeViewModel.changePassword(mNiu, mPassword, mCurrentPassword, mNewPassword, mRepeatPassword);
        }
    });
}

....

void changePassword(AutoCompleteTextView niu, EditText password, TextView currentPassword, TextView newPassword, TextView repeatPassword){
    if(password.getText().toString().equals(currentPassword.getText().toString()) &&
            newPassword.getText().toString().equals(repeatPassword.getText().toString())){
        int yourNiu = Integer.parseInt(niu.getText().toString());
        if (yourNiu < 10) {
            mRepository.changePassword(yourNiu, newPassword.getText().toString());
        } else if(yourNiu >= 10 && yourNiu < 20) {
        }else{
        }
    }
}

，我使用来自其他.xml文件（activity_login.xml）的R.id.NIU和R.id.password。我的问题是password.getText（）。toString（）为null。有没有简单的解决方案？

Answer 1

，我使用来自其他.xml文件的R.id.NIU和R.id.password （activity_login.xml）

这是您的问题所在。只需在activity_password_change.xml中创建此视图

P.S。您不能使用另一视图层次结构中一个视图层次结构中的视图。

UPD

我假设您正在从LoginActivity启动PasswordChangeActivity。将此代码放在LoginActivity中，而不是启动PasswordChangeActivity的代码

Intent intent = new Intent(this, PasswordChangeActivity.class);
intent.putExtra("pass", mPassword.getText.toString());
intent.putExtra("niu", mNiu.getText.toString());
startActivity(intent);

在setContentView（）方法之后的PasswordChangeActivity中

String pass = getIntent().getStringExtra("pass");
String niu = getIntent().getStringExtra("niu");

删除该行，因为您不再需要

mNiu = (AutoCompleteTextView) findViewById(R.id.NIU);
mPassword = (EditText) findViewById(R.id.password);

将changePassword（）签名更改为

void changePassword(String niu, String password, String currentPassword, String newPassword, String repeatPassword)

P.P.S。不要将视图传递给ViewModel，仅将数据传递给ViewModel

AutoCompleteTextView和EditText在其他活动中为null

1 个答案: