android 屏幕旋转（横屏、竖屏、反向横屏、反向竖屏）的实现

前言：根据屏幕的旋转自动实现应用界面旋转，横屏、竖屏、反向横屏、反向竖屏。

布局文件

<?xml version="1.0" encoding="utf-8"?><android.support.constraint.ConstraintLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:app="http://schemas.android.com/apk/res-auto"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent">    <Button        android:id="@+id/btn_ori"        android:text="方向"        android:layout_width="wrap_content"        android:layout_height="wrap_content"/>    <ImageView        android:src="@mipmap/map"        android:layout_width="wrap_content"        android:layout_height="wrap_content"/>android.support.constraint.ConstraintLayout>

监听器类：

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 onSensorChanged(SensorEvent sensorEvent) {        float[] values = sensorEvent.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) {            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();        }    }    @Override    public void onAccuracyChanged(Sensor sensor, int i) {    }}

Activity类

public class OrientationActivity extends AppCompatActivity {    private Button button;    private Handler handler;    private OrientationSensorListener listener;    private SensorManager sm;    private Sensor sensor;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_orientation);        Log.i("mylog:", "onCreate()");        handler = new Handler(){            @Override            public void handleMessage(Message msg) {                if (msg.what == 888) {                    int orientation = msg.arg1;                    if (orientation > 45 && orientation < 135) {                        OrientationActivity.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_REVERSE_LANDSCAPE);                        Log.d("mylog", "横屏翻转: ");                    } else if (orientation > 135 && orientation < 225) {                        OrientationActivity.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_FULL_SENSOR);                        Log.d("mylog", "竖屏翻转: ");                    } else if (orientation > 225 && orientation < 315) {                        OrientationActivity.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);                        Log.d("mylog", "横屏: ");                    } else if ((orientation > 315 && orientation < 360) || (orientation > 0 && orientation < 45)) {                        OrientationActivity.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);                        Log.d("mylog", "竖屏: ");                    }                }                super.handleMessage(msg);            }        };        sm = (SensorManager) getSystemService(Context.SENSOR_SERVICE);        sensor = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);        listener = new OrientationSensorListener(handler);        sm.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_UI);        button = (Button) findViewById(R.id.btn_ori);        button.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                Log.i("mylog:", getResources().getConfiguration().orientation +"");            }        });    }    @Override    protected void onPause() {        super.onPause();        sm.unregisterListener(listener);    }    @Override    protected void onResume() {        super.onResume();        sm.registerListener(listener, sensor, SensorManager.SENSOR_DELAY_UI);    }}

AndroidManifest.xml文件

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"          package="com.ndt.testdemo">    <application        android:allowBackup="true"        android:icon="@mipmap/ic_launcher"        android:label="@string/app_name"        android:roundIcon="@mipmap/ic_launcher_round"        android:supportsRtl="true"        android:theme="@style/AppTheme">        <activity            android:name=".com.OrientationActivity"            android:configChanges="keyboardHidden|screenSize|orientation">            <intent-filter>                <action android:name="android.intent.action.MAIN"/>                <category android:name="android.intent.category.LAUNCHER"/>            intent-filter>        activity>    application>manifest>

android 屏幕旋转（横屏、竖屏、反向横屏、反向竖屏）的实现

android 屏幕旋转（横屏、竖屏、反向横屏、反向竖屏）的实现

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