使用按钮以编程方式更改屏幕方向

Question

我认为这是可实现的,因为屏幕旋转行为可以达到应用程序级别.

Answer 1

是的它是可实施的!

ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

ActivityInfo.SCREEN_ORIENTATION_PORTRAIT

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

ActivityInfo

http://developer.android.com/reference/android/content/pm/ActivityInfo.html

参考链接:

Button buttonSetPortrait = (Button)findViewById(R.id.setPortrait);
Button buttonSetLandscape = (Button)findViewById(R.id.setLandscape);

buttonSetPortrait.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
   }

});

buttonSetLandscape.setOnClickListener(new Button.OnClickListener(){

   @Override
   public void onClick(View arg0) {
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
   }

});

http://android-er.blogspot.in/2011/08/set-screen-orientation-programmatically.html

Answer 2

是的,您可以随时以编程方式设置屏幕方向:

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

分别用于横向和纵向模式.setRequestedOrientation()方法可用于Activity类,因此可以在Activity中使用它.

这就是你如何获得当前的屏幕方向并根据其当前状态充分设置它:

Display display = ((WindowManager) getSystemService(WINDOW_SERVICE)).getDefaultDisplay();
final int orientation = display.getOrientation(); 
 // OR: orientation = getRequestedOrientation(); // inside an Activity

// set the screen orientation on button click
Button btn = (Button) findViewById(R.id.yourbutton);
btn.setOnClickListener(new View.OnClickListener() {
          public void onClick(View v) {

              switch(orientation) {
                   case Configuration.ORIENTATION_PORTRAIT:
                       setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
                       break;
                   case Configuration.ORIENTATION_LANDSCAPE:
                       setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
                       break;                   
               }
          }
   });

摘自此处:http://techblogon.com/android-screen-orientation-change-rotation-example/

编辑

此外,您可以使用以下方式获取屏幕方向Configuration:

Activity.getResources().getConfiguration().orientation

Answer 3

如果可能,请不要使用SCREEN_ORIENTATION_LANDSCAPE或SCREEN_ORIENTATION_PORTRAIT.而是使用:

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT);

这些允许用户将设备分别定向到横向或纵向.如果你曾经不得不用充电线进入你的肚子来玩游戏,那么你就知道为什么同时拥有两个方向对用户来说很重要.

注意:对于手机,至少有几个我已经检查过,它只允许"正面朝上"的纵向模式,但是,SENSOR_PORTRAIT在平板电脑上正常工作.

注意:此功能是在API级别9中引入的,因此如果您必须支持8或更低(此时不太可能),请改为使用:

setRequestedOrientation(Build.VERSION.SDK_INT < 9 ?
                        ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE :
                        ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);
setRequestedOrientation(Build.VERSION.SDK_INT < 9 ?
                        ActivityInfo.SCREEN_ORIENTATION_PORTRAIT :
                        ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT);

Answer 4

使用此选项设置屏幕的方向:

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

要么

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

并且不要忘记将其添加到您的清单中:

android:configChanges = "orientation"

Answer 5

工作代码：

private void changeScreenOrientation() {
    int orientation = yourActivityName.this.getResources().getConfiguration().orientation;
    if (orientation == Configuration.ORIENTATION_LANDSCAPE) {
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        showMediaDescription();
    } else {
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
        hideMediaDescription();
    }
    if (Settings.System.getInt(getContentResolver(),
            Settings.System.ACCELEROMETER_ROTATION, 0) == 1) {
        Handler handler = new Handler();
        handler.postDelayed(new Runnable() {
            @Override
            public void run() {
                setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR);
            }
        }, 4000);
    }
}

在您的按钮中单击调用此方法