在配置改变布局没有在android中自动更改

Question

我在android 清单中使用了android:configChanges="orientation|screenSize"，因为当我旋转设备时，我的设备不会在layout-land文件夹中选择布局XML文件我有什么问题？

Answer 1

如果你选择使用android：configChanges =＆＃34; orientation | screenSize＆＃34;然后你在屏幕旋转时手动更新布局。

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

    if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT)
    {
        setContentView(R.layout.portrait);
    }
    if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE)
    {
        setContentView(R.layout.landscape);
    }
}

修改 使用片段使事情复杂化并使用android：configChanges =＆＃34; orientation | screenSize＆＃34;反正它不推荐。您应该在片段中使用onSaveInstanceState来保存片段的状态，然后在onCreateView中恢复片段状态：

public class DetailsFragment extends Fragment
{
    private EditText ed;

    public static DetailsFragment newInstance(int index)
    {
        return new DetailsFragment();
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
    {
        View view = inflater.inflate(R.layout.fragment_layout, container, false);
        ed = (EditText) view.findViewById(R.id.fragment_edit);

        if(null != savedInstanceState)
        {
            //restore the text if null != savedInstanceState -> fragment is recreated
            ed.setText(savedInstanceState.getString("RESTORE_TEXT"));
        }

        return view;
    }

    @Override
    public void onSaveInstanceState(Bundle outState)
    {
        if(null != ed)
        {
            //save the text written in the edittext
            outState.putString("RESTORE_TEXT", ed.getText().toString());
        }

        super.onSaveInstanceState(outState);
    }
}

我已经在您可以找到here的项目中编写了上述示例，您可以更好地了解它的工作原理。希望它有所帮助。