android中Activity横竖屏切换的那些事

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

  
    

    
  

在api 3.2 以前，我们只需这样配置即可，android:cOnfigChanges="keyboardHidden|orientation"。


  
    

    
  

public void onConfigurationChanged(Configuration newConfig) { 

  super.onConfigurationChanged(newConfig); 

  if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) { 
    // 加入横屏要处理的代码 
  } else if (this.getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) { 
    // 加入竖屏要处理的代码 
  } 
}

// 去掉ActionBar
requestWindowFeature(Window.FEATURE_NO_TITLE); 
// 设置全屏
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);

public class BaseActivity extends AppCompatActivity {


  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
  }

}

//注册重力感应器 屏幕旋转
mSm = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
mSensor = mSm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
mSm.registerListener(mOrientationSensorListener, mSensor, SensorManager.SENSOR_DELAY_UI);

public class OrientationSensorListener implements SensorEventListener {
  private static final int _DATA_X = 0;
  private static final int _DATA_Y = 1;
  private static final int _DATA_Z = 2;

  public static final int ORIENTATION_UNKNOWN = -1;
  private boolean sensor_flag = true;

  public static final String TAG = "xujun";

  int mLastAngle=-1;
  AngleChangleListener mAngleChangleListener;

  public OrientationSensorListener(AngleChangleListener angleChangleListener){
    mAngleChangleListener=angleChangleListener;
  }

  @Override
  public void onAccuracyChanged(Sensor arg0, int arg1) {
    // TODO Auto-generated method stub

  }


  @Override
  public void onSensorChanged(SensorEvent event) {

    float[] values = event.values;

    int orientation = ORIENTATION_UNKNOWN;
    float X = -values[_DATA_X];
    float Y = -values[_DATA_Y];
    float Z = -values[_DATA_Z];

    /**
     * 这一段据说是 android源码里面拿出来的计算 屏幕旋转的 不懂 先留着 万一以后懂了呢
     */
    float magnitude = X * X + Y * Y;
    // Don't trust the angle if the magnitude is small compared to the y value
    if (magnitude * 4 >= Z * Z) {
      //屏幕旋转时
      float OneEightyOverPi= 57.29577957855f;
      float angle = (float) Math.atan2(-Y, X) * OneEightyOverPi;
      orientation = 90 - (int) Math.round(angle);
      // normalize to 0 - 359 range
      while (orientation >= 360) {
        orientation -= 360;
      }
      while (orientation <0) {
        orientation += 360;
      }
    }

    if (orientation > 225 && orientation <315) { //横屏
      sensor_flag = false;
    } else if ((orientation > 315 && orientation <360) || (orientation > 0 &&
        orientation <45)) { //竖屏
      sensor_flag = true;
    }
//    Log.i(TAG, "onSensorChanged: orientation=" + orientation+"  mLastAngle="+mLastAngle);
    if(mLastAngle!=orientation && mAngleChangleListener!=null){
      mAngleChangleListener.onChange(orientation);
      mLastAngle=orientation;
    }

  }
}

private static final String KEY_INDEX = "index";
private int mCurrentIndex = 0;

@Override
protected void onCreate(Bundle savedInstanceState) {
  if (savedInstanceState != null) {
    mCurrentIndex = savedInstanceState.getInt(KEY_INDEX, 0);
  }
}

@Override
protected void onPause(Bundle outState) {
  super.onSaveInstanceState(outState);
  outState.putInt(KEY_INDEX, mCurrentIndex);
}