解決 ANDROID 使用 CAMERA 在直立時 90 度問題

在使用 CAMERA Preview 時, 如果不平放. 影像將會旋轉90度. 在其它手機是否也有相同問題, 並不清礎, 但是在 ANDROID 2.2 平台上的華為 U8150 會有這個問題. 附件為 CAMERA 與指南針(COMPASS) 應用實驗作品. package org.ivan.camera; import java.io.IOException; import java.lang.reflect.Method; import android.app.Activity; import android.hardware.Camera; import android.os.Build; import android.os.Bundle; import android.view.SurfaceHolder; import android.view.SurfaceView; import java.util.List; import android.content.Context; import android.content.res.Configuration; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.widget.Toast; public class CameraActivity extends Activity implements SurfaceHolder.Callback { /** Called when the activity is first created. */ Camera myCamera; SurfaceView previewSurfaceView; SurfaceHolder previewSurfaceHolder; boolean previewing = false; private static SensorManager mySensorManager; private boolean sersorrunning; private MyCompassView myCompassView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); previewSurfaceView = (SurfaceView)findViewById(R.id.previewsurface); previewSurfaceHolder = previewSurfaceView.getHolder(); previewSurfaceHolder.addCallback(this); previewSurfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); myCompassView = (MyCompassView)findViewById(R.id.mycompassview); mySensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE); List<Sensor> mySensors = mySensorManager.getSensorList(Sensor.TYPE_ORIENTATION); if(mySensors.size() > 0){ mySensorManager.registerListener(mySensorEventListener, mySensors.get(0), SensorManager.SENSOR_DELAY_NORMAL); sersorrunning = true; Toast.makeText(this, "Start ORIENTATION Sensor", Toast.LENGTH_LONG).show(); } else{ Toast.makeText(this, "No ORIENTATION Sensor", Toast.LENGTH_LONG).show(); sersorrunning = false; finish(); } } @Override public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) { // TODO Auto-generated method stub if(previewing){ myCamera.stopPreview(); previewing = false; } try { myCamera.setPreviewDisplay(arg0); Camera.Parameters parameters = myCamera.getParameters(); if (Integer.parseInt(Build.VERSION.SDK) >= 8) setDisplayOrientation(myCamera, 90); else { if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT) { parameters.set("orientation", "portrait"); parameters.set("rotation", 90); } if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) { parameters.set("orientation", "landscape"); parameters.set("rotation", 90); } } myCamera.setParameters(parameters); myCamera.startPreview(); previewing = true; } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } } protected void setDisplayOrientation(Camera camera, int angle) { Method downPolymorphic; try { downPolymorphic = camera.getClass().getMethod( "setDisplayOrientation", new Class[] { int.class }); if (downPolymorphic != null) downPolymorphic.invoke(camera, new Object[] { angle }); } catch (Exception e1) { } } @Override public void surfaceCreated(SurfaceHolder arg0) { // TODO Auto-generated method stub myCamera = Camera.open(); } @Override public void surfaceDestroyed(SurfaceHolder arg0) { // TODO Auto-generated method stub myCamera.stopPreview(); myCamera.release(); myCamera = null; previewing = false; } private SensorEventListener mySensorEventListener = new SensorEventListener(){ @Override public void onAccuracyChanged(Sensor sensor, int accuracy) { // TODO Auto-generated method stub } @Override public void onSensorChanged(SensorEvent event) { // TODO Auto-generated method stub myCompassView.updateDirection((float)event.values[0]); } }; @Override protected void onDestroy() { //TODO Auto-generated method stub super.onDestroy(); if(sersorrunning){ mySensorManager.unregisterListener(mySensorEventListener); } } }