Android 更改布局问题

我是一名android应用程序开发人员。我想在我的应用程序中执行以下操作

当我点击一个布局按钮时，它会变成横向。如果我再点击这个按钮，它会变成纵向。我知道这很简单

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

但有一个陷阱

当点击按钮后，它处于横向模式，我旋转设备，它也检测到设备旋转，并应更改为纵向视图

我们知道，在设置setRequestedOrientation OnConfiguration之后，从未调用过Changed。那我该怎么做呢

我添加了以下代码：

toggleButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
     if (toggleButton.getText().toString().trim().equalsIgnoreCase("landscape")){
        landscapeMode(true);
        toggleButton.setText("portrait");
     } else {
        landscapeMode(false);
        toggleButton.setText("landscape");
    }
  }
});    


  public void toggleScreen(boolean fullscreen) {
    if (landscapeMode) {
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
         //After this it is not detecting device rotation but it is called when             I am clicking on the button first time.
    } else {
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);
        //After this it is detecting device rotation but it is called when I am clicking on the button second time.
    }

}

---

这是因为默认情况下，您必须在清单文件中将活动设置为“Potrait”。像这样

 <activity android:name=".MainActivity"
        android:screenOrientation="portrait">
        <intent-filter>
            <action android:name="android.intent.action.MAIN"/>

            <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>
    </activity>

此外，您还可以在屏幕方向更改时保存数据。使用

 @Override
public void onSaveInstanceState(final Bundle outState, PersistableBundle outPersistentState) {
    super.onSaveInstanceState(outState, outPersistentState);
  // Save UI state changes to the savedInstanceState.
  // This bundle will be passed to onCreate if the process is
  // killed and restarted.
  outState.putBoolean("landscape", true);
  // etc.
}

并将保存的数据保存到-

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
  super.onRestoreInstanceState(savedInstanceState);
  // Restore UI state from the savedInstanceState.
  // This bundle has also been passed to onCreate.
  boolean myBoolean = savedInstanceState.getBoolean("landscape");
}

---

这是因为默认情况下，您必须在清单文件中将活动设置为“Potrait”。像这样

 <activity android:name=".MainActivity"
        android:screenOrientation="portrait">
        <intent-filter>
            <action android:name="android.intent.action.MAIN"/>

            <category android:name="android.intent.category.LAUNCHER"/>
        </intent-filter>
    </activity>

此外，您还可以在屏幕方向更改时保存数据。使用

 @Override
public void onSaveInstanceState(final Bundle outState, PersistableBundle outPersistentState) {
    super.onSaveInstanceState(outState, outPersistentState);
  // Save UI state changes to the savedInstanceState.
  // This bundle will be passed to onCreate if the process is
  // killed and restarted.
  outState.putBoolean("landscape", true);
  // etc.
}

并将保存的数据保存到-

@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
  super.onRestoreInstanceState(savedInstanceState);
  // Restore UI state from the savedInstanceState.
  // This bundle has also been passed to onCreate.
  boolean myBoolean = savedInstanceState.getBoolean("landscape");
}

---

首先，非常感谢你的回复。但是它不起作用。首先，非常感谢你的回复。但是它不起作用