方向的激活开关更改了吗? [英] Switch activiy on orientation changed?

问题描述

旋转手机时如何切换到其他活动?

How can I switch to another activity when rotating the phone?

我的要求:

• 活动A和活动B仅是纵向
• Acitvity L仅用于风景
• 当将显示A或B的风景模式时，将启动L.当显示L的肖像时，将显示A或B.

我可以创建此行为，期望返回按钮.按下该按钮时，我要避免横向使用A/B或纵向使用L，这是我想避免的.

I can create this behaviour, expect for the back button. When it is pressed I'm either getting A/B in landscape or L in portrait, which I want to prevent.

我在做什么(活动A和B，但L相似)

What I'm doing (Activities A & B, but L is similar)

要在定向更改时触发活动调用:

To trigger the activity call on orientation change:

@Override
public void onConfigurationChanged(Configuration newConfig) {
    int newOrientation = newConfig.orientation;
    if (newOrientation == Configuration.ORIENTATION_LANDSCAPE) {
        Intent intent = new Intent(this, ActivityL.class);
        startActivity(intent);
    }

    super.onConfigurationChanged(newConfig);
}

我想要类似以下的内容.但是手动(重新)设置方向完全无法调用onConfigurationChanged():

I want something like the following. But manually (re)setting the orientation prevents onConfigurationChanged() from being called at all:

@Override
public void onResume(){
    super.onResume();

    int currentOrientation = this.getResources().getConfiguration().orientation;
    if (currentOrientation == Configuration.ORIENTATION_LANDSCAPE) {
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
    }
}

当然，如果我在其他生命周期方法或onCreate(...)中执行此操作，也会发生同样的情况.

On course the same happens if I do it in other lifecycle methods or onCreate(...).

所有活动都有:

  android:screenOrientation="sensor"

我还尝试使用旋转角度来模拟方向变化，但是这种行为似乎主要是随机的，甚至与正常的方向变化都不接近.

I also tried imitating the orientation change using the rotationg angle, but then the behavior seems mostly random and not even close to the normal orientation change.

推荐答案

我想setRequestedOrientation()会覆盖我在AndroidManifest中定义的内容:

I suppose setRequestedOrientation() overrides what I had defined in the AndroidManifest:

android:screenOrientation="sensor"

我需要将其重置为传感器以恢复自动方向更改:

I need to reset it to sensor to get the automated orientation changes back:

@Override
public void onConfigurationChanged(Configuration newConfig) {
    int newOrientation = newConfig.orientation;
    if (newOrientation == Configuration.ORIENTATION_LANDSCAPE) {
        Intent intent = new Intent(this, ActivityL.class);
        startActivity(intent);
    }
    super.onConfigurationChanged(newConfig);

    // Reset to sensor:
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);
}

我对在onConfigurationChanged(..)中调用它感到惊讶，因为该方法不再通过方向更改来调用.但是我想当活动恢复时(按下后退按钮时)，配置会以其他方式更改.

I'm a bit surprised that calling it within onConfigurationChanged(..) works, since that method is no longer called by orientation changes. But I guess the configuration is changed in some other way when the activity is resumed(when back button is pressed).

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