Question

我创建了两个xml文件，activity_main其他一个是activity_main_land。两者都有2个EditText字段。两者都有ID，并且两个XML ID都相同。调用onConfigchange()方法时，我更改了XML文件。现在当我旋转设备时，EditText丢失了数据。你能帮我解决这个问题。

public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    Toast.makeText(MainActivity.this, "simple", Toast.LENGTH_SHORT).show();
    if(newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE){
        Toast.makeText(MainActivity.this, "Landscape", Toast.LENGTH_SHORT).show();

        setContentView(R.layout.activity_main_land);
    }else if(newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){
        Toast.makeText(MainActivity.this, "portreate", Toast.LENGTH_SHORT).show();

        setContentView(R.layout.activity_main);
    }

我也试过参考：

How to retain EditText data on orientation change?

Answer 1

@Override
protected void onCreate (Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.login_screen);
...
...
String userName, password;
if(savedInstanceState!=null)
{
    userName = savedInstanceState.getString("user_name");
    password= savedInstanceState.getString("password");
}

if(userName != null)
    userNameEdtTxt.setText(userName);
if(password != null)
    passEdtTxt.setText(password);
}
....

@Override
protected void onSaveInstanceState (Bundle outState)
{
    outState.putString("user_name", userNameEdtTxt.getText().toString());
    outState.putString("password",  passEdtTxt.getText().toString());
}

Answer 2

试试这个对我来说很好。

在你的两个xml文件中，保持edittexts id相同，

public class MainActivity extends Activity {


    EditText userName;

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

        userName = (EditText)findViewById(R.id.edtUserName);
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);

        String storedUsername = userName.getText().toString();

        // landscape mode
        if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE){
            setContentView(R.layout.activity_main);
            userName = (EditText) findViewById(R.id.edtUserName);
        }else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){
            setContentView(R.layout.activity_main1);
            userName = (EditText) findViewById(R.id.edtUserName);
        }
        // set username
        userName.setText(storedUsername);
    }

}

旋转设备android时编辑文本丢失的数据

2 个答案: