在播放视频的时候，可能要做横竖屏的切换，但是，用户可以设置自己的手机关掉屏幕旋转，这个时候就需要想其他的办法了，比如：加速传感器或者OrientationEventListener。
1、这是用加速传感器来实现：
public class ScreenSwitchUtils {
private static final String TAG = ScreenSwitchUtils.class.getSimpleName();
private volatile static ScreenSwitchUtils mInstance;
private Activity mActivity;
// 是否是竖屏
private boolean isPortrait = true;
private SensorManager sm;
private OrientationSensorListener listener;
private Sensor sensor;
private SensorManager sm1;
private Sensor sensor1;
private OrientationSensorListener1 listener1;
private Handler mHandler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case 888:
int orientation = msg.arg1;
if (orientation > 45 && orientation < 135) {
} else if (orientation > 135 && orientation < 225) {
} else if (orientation > 225 && orientation < 315) {
if (isPortrait) {
Log.e("test", "切换成横屏");
mActivity.setRequestedOrientation(0);
isPortrait = false;
}
} else if ((orientation > 315 && orientation < 360) || (orientation > 0 && orientation < 45)) {
if (!isPortrait) {
Log.e("test","切换成竖屏");
mActivity.setRequestedOrientation(1);
isPortrait = true;
}
}
break;
default:
break;
}
};
};
/** 返回ScreenSwitchUtils单例 **/
public static ScreenSwitchUtils init(Context context) {
if (mInstance == null) {
synchronized (ScreenSwitchUtils.class) {
if (mInstance == null) {
mInstance = new ScreenSwitchUtils(context);
}
}
}
return mInstance;
}
private ScreenSwitchUtils(Context context) {
Log.d(TAG, "init orientation listener.");
// 注册重力感应器,监听屏幕旋转
sm = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
sensor = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
listener = new OrientationSensorListener(mHandler);
// 根据 旋转之后/点击全屏之后 两者方向一致,激活sm.
sm1 = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
sensor1 = sm1.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
listener1 = new OrientationSensorListener1();
}
/** 开始监听 */
public void start(Activity activity) {
Log.d(TAG, "start orientation listener.");
mActivity = activity;
sm.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_UI);
}
/** 停止监听 */
public void stop() {
Log.d(TAG, "stop orientation listener.");
sm.unregisterListener(listener);
sm1.unregisterListener(listener1);
}
/**
* 手动横竖屏切换方向
*/
public void toggleScreen() {
sm.unregisterListener(listener);
sm1.registerListener(listener1, sensor1,SensorManager.SENSOR_DELAY_UI);
if (isPortrait) {
isPortrait = false;
// 切换成横屏
mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
} else {
isPortrait = true;
// 切换成竖屏
mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}
}
public boolean isPortrait(){
return this.isPortrait;
}
/**
* 重力感应监听者
*/
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 Handler rotateHandler;
public OrientationSensorListener(Handler handler) {
rotateHandler = handler;
}
public void onAccuracyChanged(Sensor arg0, int arg1) {
}
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];
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 (rotateHandler != null) {
rotateHandler.obtainMessage(888, orientation, 0).sendToTarget();
}
}
}
public class OrientationSensorListener1 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;
public OrientationSensorListener1() {
}
public void onAccuracyChanged(Sensor arg0, int arg1) {
}
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];
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) {// 检测到当前实际是横屏
if (!isPortrait) {
sm.registerListener(listener, sensor,SensorManager.SENSOR_DELAY_UI);
sm1.unregisterListener(listener1);
}
} else if ((orientation > 315 && orientation < 360) || (orientation > 0 && orientation < 45)) {// 检测到当前实际是竖屏
if (isPortrait) {
sm.registerListener(listener, sensor,SensorManager.SENSOR_DELAY_UI);
sm1.unregisterListener(listener1);
}
}
}
}
}
转载请标明出处：http://blog.csdn.net/goldenfish1919/article/details/47423131
使用的时候：
public class MainActivity extends Activity implements OnClickListener {
private ScreenSwitchUtils instance;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
instance = ScreenSwitchUtils.init(this.getApplicationContext());
}
@Override
protected void onStart() {
super.onStart();
instance.start(this);
}
@Override
protected void onStop() {
super.onStop();
instance.stop();
}
@SuppressLint("NewApi")
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
Log.e("test", "onConfigurationChanged");
if (instance.isPortrait()) {
// 切换成竖屏
LayoutParams params1 = new RelativeLayout.LayoutParams(screenWidth, DensityUtil.dip2px(this, 160));
videoView.setLayoutParams(params1);
Toast.makeText(getApplicationContext(), "竖屏", 0).show();
Log.e("test", "竖屏");
} else {
// 切换成横屏
LayoutParams params1 = new RelativeLayout.LayoutParams(screenHeight, screenWidth);
videoView.setLayoutParams(params1);
Toast.makeText(getApplicationContext(), "横屏", 0).show();
Log.e("test", "横屏");
}
}
@Override
public void onClick(View arg0) {
switch (arg0.getId()) {
case R.id.iv_stretch:
instance.toggleScreen();
break;
}
}
}
调用了activity.setRequestedOrientation()以后，会触发activity.onConfigurationChanged();可以在这里面重新设置播放界面的大小。
参考：http://download.csdn.net/download/liubo080852/8446445
2.还有一种更简单的方式OrientationEventListener：
public class ScreenOrientationUtil {
private int mOrientation;
private OrientationEventListener mOrEventListener;
private int mOrientation1;
private OrientationEventListener mOrEventListener1;
private Activity mActivity;
private static ScreenOrientationUtil instance = new ScreenOrientationUtil();
public static ScreenOrientationUtil getInstance(){
return instance;
}
public void start(Activity activity){
this.mActivity = activity;
if(mOrEventListener == null){
initListener();
}
mOrEventListener.enable();
}
public void stop(){
if(mOrEventListener != null){
mOrEventListener.disable();
}
if(mOrEventListener1 != null){
mOrEventListener1.disable();
}
}
private void initListener(){
mOrEventListener = new OrientationEventListener(mActivity) {
@Override
public void onOrientationChanged(int rotation) {
Log.e("test", ""+rotation);
if (rotation == OrientationEventListener.ORIENTATION_UNKNOWN) {
return;
}
int orientation = convert2Orientation(rotation);
// 方向没有变化,跳过
if (orientation == mOrientation) {
return;
}
mOrientation = orientation;
mActivity.setRequestedOrientation(mOrientation);
}
};
mOrEventListener1 = new OrientationEventListener(mActivity) {
@Override
public void onOrientationChanged(int rotation) {
if (rotation == OrientationEventListener.ORIENTATION_UNKNOWN) {
return;
}
int orientation = convert2Orientation(rotation);
// 方向没有变化,跳过
if (orientation == mOrientation1) {
return;
}
mOrientation1 = orientation;
if(mOrientation1 == mOrientation){
mOrEventListener1.disable();
mOrEventListener.enable();
}
}
};
}
public boolean isPortrait(){
if(mOrientation == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT || mOrientation == ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT){
return true;
}
return false;
}
public int getOrientation(){
return mOrientation;
}
public void toggleScreen(){
mOrEventListener.disable();
mOrEventListener1.enable();
int orientation = 0 ;
if(mOrientation == ActivityInfo.SCREEN_ORIENTATION_PORTRAIT){
orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
}else if(mOrientation == ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE){
orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
}else if(mOrientation == ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE){
orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
}else if(mOrientation == ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT){
orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
}
mOrientation = orientation;
mActivity.setRequestedOrientation(mOrientation);
}
private int convert2Orientation(int rotation){
int orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
if (((rotation >= 0) && (rotation <= 45)) || (rotation > 315)) {
orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
} else if ((rotation > 45) && (rotation <= 135)) {
orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE;
} else if ((rotation > 135) && (rotation <= 225)) {
orientation = ActivityInfo.SCREEN_ORIENTATION_REVERSE_PORTRAIT;
} else if ((rotation > 225) && (rotation <= 315)) {
orientation = ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE;
} else {
orientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT;
}
return orientation;
}
}