Disable screen rotation at runtime on Android

public class testScreenRotation extends Activity {
/** Called when the activity is first created. */

private int mRuntimeOrientation;
   private boolean mDisableScreenRotation=true;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mRuntimeOrientation = this.getScreenOrientation();
    setContentView(R.layout.main);


}
protected int getScreenOrientation() {
/*
    Display display = getWindowManager().getDefaultDisplay();
    int orientation = display开发者_StackOverflow中文版.getOrientation();

    if (orientation == Configuration.ORIENTATION_UNDEFINED) {
       orientation = getResources().getConfiguration().orientation;

       if (orientation == Configuration.ORIENTATION_UNDEFINED) {
          if (display.getWidth() == display.getHeight())
             orientation = Configuration.ORIENTATION_SQUARE;
          else if(display.getWidth() < display.getHeight())

             orientation = Configuration.ORIENTATION_PORTRAIT;
          else
             orientation = Configuration.ORIENTATION_LANDSCAPE;
          }
       }


    return orientation;
  */
    return Configuration.ORIENTATION_PORTRAIT;
 }
@Override
public void onConfigurationChanged(Configuration newConfig) {
    // TODO Auto-generated method stub
       if (mDisableScreenRotation) {
             super.onConfigurationChanged(newConfig);
             this.setRequestedOrientation(mRuntimeOrientation);
          } else {
             mRuntimeOrientation = this.getScreenOrientation();
             super.onConfigurationChanged(newConfig);
          }
       }

}

my app as above ,and add android:configChanges="orientation" in the xml.when my app start my screen is PORTRAIT,i press ctrl+F12,the screen also roate,the screen is LANDSCAPE,second i press ctrl+F12,the screen also roate,the screen is PORTRAIT,then i press ctrl+F12,the screen keep PORTRAIT. so i press again,the screen keep PORTRAIT. my question is that why my screen not keep PORTRAIT when the app start.

Edit:i want to use code to control the screen roate, if i can do this?

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If you are trying to get your application to be in Portrait-mode all the time, you can this line to the element in the manifest

android:screenOrientation="portrait"

Add This line in each activity in the AndroidManifest.xml file.

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I believe the method you are looking for is Activity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_<PORTRAIT/LANDSCAPE>)

This together with

android:configChanges="orientation"

for that activity in the manifest to tell the system you will handle the orientation yourself should disable automatic reorientation.

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Change the AndroidManifest.xml file. Thats enough.

<activity android:name="Activity_Name" android:screenOrientation="portrait"/>

Now your app will not change the Orientation.

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http://androidbiancheng.blogspot.com/2010/10/java-setrequestedorientation.html, this link solved my question, setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);and not need add the line android:configChanges="orientation" in xml.so i think i cannot use Configuration to get the screen Orientation,should use ActivityInfo.

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You can disable screen rotation on runtime from java source code as well.
Just try this way

private void setAutoRotation(final boolean autorotate) {
        AsyncTask.execute(new Runnable() {
            public void run() {
                try {
                    IWindowManager wm = IWindowManager.Stub.asInterface(ServiceManager.getService(Context.WINDOW_SERVICE));
                    if (autorotate) {
                        wm.thawRotation();
                    } else {
                        wm.freezeRotation(-1);
                    }
                } catch (RemoteException exc) {
                    Log.secW(TAG, "Unable to save auto-rotate setting");
                }
            }
        });
    }

Now try to call this method during your application runtime. May be in some methods or on some buttons.

setAutoRotation(false);

setAutoRotation(true);