android - 如何使用 fragment 处理方向变化？

Question

我现在有 2 个 fragment ，一个 fragment 处理纵向模式，然后另一个 fragment 处理横向模式。但问题是，当从纵向旋转到横向然后再回到纵向时。它不会显示与第一个肖像模式相同的内容。有什么代码可以解决这个问题吗？

此代码位于 fragment 容器内:

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

    FragmentManager fm = getSupportFragmentManager();

    final Fragment fragment = Frag.newInstance(); //Portrait layout
    final Fragment fragment2 = Frag2.newInstance(); //Landscape layout

    int orientation = getResources().getConfiguration().orientation; //check whether is it portrait or landscape


    if(orientation == Configuration.ORIENTATION_PORTRAIT){
        Fragment fragTAG = fm.findFragmentByTag(TAG_P);
        if(fragTAG == null){
            Log.i("test","test");
                fm.beginTransaction()
                        .replace(R.id.fragPlaceHolder, fragment, TAG_P)
                        .commit(); //Portrait
        }
        else{
            fm.beginTransaction().replace(R.id.fragPlaceHolder,fragTAG).commit();
        }

    }
    if(orientation == Configuration.ORIENTATION_LANDSCAPE){
        Fragment fragTAG = fm.findFragmentByTag(TAG_L);
        if(fragTAG == null){
                fm.beginTransaction()
                        .replace(R.id.fragPlaceHolder, fragment2, TAG_L)
                        .commit(); //Landscape
        }
        else{
            fm.beginTransaction().replace(R.id.fragPlaceHolder,fragTAG).commit();
        }
    }

}

Answer 1

第 1 步:在您的 Activity 中添加配置更改

    <activity android:name=".ui.createtasks.CreateTaskActivity"
        android:configChanges="orientation|screenSize|keyboardHidden" > </activity>

第 2 步: 将您的编辑文本值添加到 onSaveInstanceState

 @Override
public void onSaveInstanceState(@NonNull Bundle outState) {
    super.onSaveInstanceState(outState);
     outState.putCharSequence(KEY_TITLE, et_text.getText().toString());
 }

第 3 步: 通过 onViewStateRestored

获取您保存的编辑文本值

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

    String savedTitle = null;
    if (savedInstanceState != null) {
        savedTitle = savedInstanceState.getString(KEY_TITLE);
        et_text.setText(savedTitle);

    }

}