android 屏幕旋转（横屏、竖屏、反向横屏、反向竖屏）的实现

迈不过友情╰ 2022-06-06 05:13 1015阅读 0赞

## 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>