Question

我已设置am活动来处理配置更改并且它有效，这意味着在方向更改时调用onConfigurationChanged()。

活动有一个显示更改方向的按钮。点击后，它会调用setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT)。

然后不确定地设置了方向，并且不再调用onConfigurationChanged()。

当用户点击按钮而不丢失onConfigurationChanged()回调时，如何更改方向？

Answer 1

这就是我解决它的方式。我知道它正在重新发明轮子，但它符合我的要求，我找不到用标准sdk工具处理这个问题的正确方法。

首先，创建一个听取方向变化的OrientationManager类

public class OrientationManager extends OrientationEventListener{
private static final String TAG = OrientationManager.class.getName();

private int previousAngle;
private int previousOrientation;
private Context context;
private OrientationChangeListener orientationChangeListener;
private static OrientationManager instance;
private OrientationManager(Context context) {
    super(context);
    this.context = context;
}

public static OrientationManager  getInstance(Context context){
    if (instance == null){
        instance = new OrientationManager(context);
    }
    return instance;
}

public int getOrientation(){
    return previousOrientation;
}

public void setOrientation(int orientation){
    this.previousOrientation = orientation;
}


@Override
public void onOrientationChanged(int orientation) {
    if (orientation == -1)
        return;
    if(previousOrientation == 0){
        previousOrientation = context.getResources().getConfiguration().orientation;
        if (orientationChangeListener != null){
            orientationChangeListener.onOrientationChanged(previousOrientation);
        }           
    }
    if (previousOrientation == Configuration.ORIENTATION_LANDSCAPE &&
            ((previousAngle > 10 && orientation <= 10) ||
            (previousAngle < 350 && previousAngle > 270 && orientation >= 350)) ){
        if (orientationChangeListener != null){
            orientationChangeListener.onOrientationChanged(Configuration.ORIENTATION_PORTRAIT);
        }
        previousOrientation = Configuration.ORIENTATION_PORTRAIT;
    }

    if (previousOrientation == Configuration.ORIENTATION_PORTRAIT &&
            ((previousAngle <90 && orientation >= 90 && orientation <270) ||
            (previousAngle > 280 && orientation <= 280 && orientation > 180))   ){
        if (orientationChangeListener != null){
            orientationChangeListener.onOrientationChanged(Configuration.ORIENTATION_LANDSCAPE);
        }
        previousOrientation = Configuration.ORIENTATION_LANDSCAPE;
    }
    previousAngle = orientation;
}

public void setOrientationChangedListener(OrientationChangeListener l){
    this.orientationChangeListener = l;
}

public interface OrientationChangeListener{
    public void onOrientationChanged(int newOrientation);
}
}

然后在您的活动工具中OrientationChangeListener并覆盖onOrientationChanged()：

public class MyActivity extends Activity implements OrientationChangeListener{

    private OrientationManager orientationManager;

    @Override
    public void onCreate(Bundle b){
        orientationManager = OrientationManager.getInstance(this);
        orientationManager.setOrientationChangedListener(this);

    }

@Override
public void onOrientationChanged(int newOrientation) {
    orientation = newOrientation;
    if (newOrientation == Configuration.ORIENTATION_LANDSCAPE){
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);
        setLandscapeConfig();
    }else{
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        setPortraitConfig();
    }
}

所以我不再使用onConfigurationChanged了，但在Manifest中保留以下行：机器人：configChanges = “取向|屏幕尺寸”

Answer 2

致电setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);将重新启动onConfigurationChanged。您可以设置这样的计时器：

// Force orientation to portrait
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT);

// Reactivate sensor orientation after delay
Timer mRestoreOrientation = new Timer();
mRestoreOrientation.schedule(new TimerTask() {
    @Override
    public void run() {
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);
    }
}, 2000);

我们只能假设用户会在延迟时间内将设备自动转为强制方向，这可能会导致糟糕的用户体验。

Answer 3

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT)

这会使你的onConfigurationChanged停止工作。如果您希望它起作用，请尝试将其添加到该活动中的清单中：

android:configChanges="orientation|screenSize"

screenSize属性仅适用于API 13+，因此，如果低于此值，则不需要它

Answer 4

..经过多次搜索后找到了解决的正确代码组合。享受！

@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);

OrientationEventListener orientationEventListener = new 
OrientationEventListener(getApplicationContext()) {
    @Override
    public void onOrientationChanged(int orientation) {
        boolean isPortrait = isPortrait(orientation);
        if (!isPortrait && savedOrientation == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) {
            savedOrientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_USER);
        } else if (isPortrait && savedOrientation == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE) {
            savedOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
            setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_USER);
        }
    }
};
orientationEventListener.enable(); 
}

private int savedOrientation;
private boolean isPortrait(int orientation) 
{
    if (orientation < 45 || orientation > 315) {
        return true;
    }
    return false;
}    

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

  if(newConfig.orientation==Configuration.ORIENTATION_LANDSCAPE)
  {
      currentOrientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
      // do what you need in landscape mode....
  }
  else if(newConfig.orientation==Configuration.ORIENTATION_PORTRAIT)
  {
        currentOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
        // do what you need in portrait mode....
  }
}  

public void rotateScreenByUIButton() {
if (currentOrientation == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE)
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
else
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}

Answer 5

您只需要将方向恢复为SCREEN_ORIENTATION_UNSPECIFIED，将再次调用onConfiguration更改

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE)
->
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED)

onConfigurationChanged一旦使用了setRequestedConfiguration就没有被调用

5 个答案: