我一直很郁闷怎么能把我之前做过的东西发扬光大...于是想到了写博客
今天写的啥？
好，首先介绍一下应用场景，每次用视频app的时候全屏会根据手机的旋转改变方向，怎么做到的呢？
来，我没来看一下Android重力感应Sensor
它是一个坐标系，它长这个样子：
0_1311854016j3VK.gif.png
不知道你看多久能看懂，反正我看明白了，特别抽象的说.....
那怎么实现呢？我觉得还是贴代码比较好
package com.*****.player.util;
import android.app.Activity;
import android.content.Context;
import android.content.pm.ActivityInfo;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Handler;
import android.os.Message;
import android.provider.Settings;
import android.util.Log;
import java.lang.ref.WeakReference;
/**
* Created by GONGPENG on 2017/2/16.
*/
public class ScreenSwitchUtils {
private volatile static ScreenSwitchUtils mInstance;
private WeakReference mActivity;
private boolean isLock = false;
// 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;
public void setLock(boolean lock) {
isLock = lock;
}
private Handler mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case 888:
int orientation = msg.arg1;
boolean autoRotateOn = false;
try {
autoRotateOn = (Settings.System.getInt(mActivity.get().getContentResolver(),
Settings.System.ACCELEROMETER_ROTATION, 0) == 1);
} catch (Exception e) {
e.printStackTrace();
}
if (orientation > 45 && orientation < 135) {
//屏幕反方向
if (!isLock && !isPortrait) {
mActivity.get().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE);
isPortrait = false;
}
} else if (orientation > 135 && orientation < 225) {
Log.e("orientation 2", orientation + ">>>>>>");
} else if (orientation > 225 && orientation < 315) {
Log.e("orientation 3", orientation + ">>>>>>");
if (!isLock && !isPortrait) {
//屏幕正方向
mActivity.get().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
isPortrait = false;
}
} else if (orientation > 315 && orientation < 340 && autoRotateOn) {
Log.e("orientation", orientation + ">>>>>>");
if (isPortrait) {
mActivity.get().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
isPortrait = false;
}
} else if (orientation > 0 && orientation < 45 && autoRotateOn) {
if (!isLock && !isPortrait){
mActivity.get().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
isPortrait = true;
}else {
// mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
// isPortrait = false;
}
}
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) {
// 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) {
mActivity = new WeakReference<>(activity);
sm.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_UI);
}
/**
* 停止监听
*/
public void stop() {
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.get().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
} else {
isPortrait = true;
// 切换成竖屏
mActivity.get().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;
}
@Override
public void onAccuracyChanged(Sensor arg0, int arg1) {
}
@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];
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() {
}
@Override
public void onAccuracyChanged(Sensor arg0, int arg1) {
}
@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];
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);
}
}
}
}
}