/* * Barebones implementation of displaying camera preview. * * Created by lisah0 on 2012-02-24 */ package com.fanxin.huangfangyi.main.widget.scan; import android.content.Context; import android.hardware.Camera; import android.hardware.Camera.AutoFocusCallback; import android.hardware.Camera.PreviewCallback; import android.util.Log; import android.view.SurfaceHolder; import android.view.SurfaceView; import java.io.IOException; /** A basic Camera preview class */ public class CameraPreview extends SurfaceView implements SurfaceHolder.Callback { private SurfaceHolder mHolder; private Camera mCamera; private PreviewCallback previewCallback; private AutoFocusCallback autoFocusCallback; @SuppressWarnings("deprecation") public CameraPreview(Context context, Camera camera, PreviewCallback previewCb, AutoFocusCallback autoFocusCb) { super(context); mCamera = camera; previewCallback = previewCb; autoFocusCallback = autoFocusCb; /* * Set camera to continuous focus if supported, otherwise use software * auto-focus. Only works for API level >=9. */ /* * Camera.Parameters parameters = camera.getParameters(); for (String f * : parameters.getSupportedFocusModes()) { if (f == * Parameters.FOCUS_MODE_CONTINUOUS_PICTURE) { * mCamera.setFocusMode(Parameters.FOCUS_MODE_CONTINUOUS_PICTURE); * autoFocusCallback = null; break; } } */ // Install a SurfaceHolder.Callback so we get notified when the // underlying surface is created and destroyed. mHolder = getHolder(); mHolder.addCallback(this); // deprecated setting, but required on Android versions prior to 3.0 mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); } public void surfaceCreated(SurfaceHolder holder) { // The Surface has been created, now tell the camera where to draw the // preview. try { mCamera.setPreviewDisplay(holder); } catch (IOException e) { Log.d("DBG", "Error setting camera preview: " + e.getMessage()); } } public void surfaceDestroyed(SurfaceHolder holder) { // Camera preview released in activity } public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { /* * If your preview can change or rotate, take care of those events here. * Make sure to stop the preview before resizing or reformatting it. */ if (mHolder.getSurface() == null) { // preview surface does not exist return; } // stop preview before making changes try { mCamera.stopPreview(); } catch (Exception e) { // ignore: tried to stop a non-existent preview } try { // Hard code camera surface rotation 90 degs to match Activity view // in portrait mCamera.setDisplayOrientation(90); mCamera.setPreviewDisplay(mHolder); mCamera.setPreviewCallback(previewCallback); mCamera.startPreview(); mCamera.autoFocus(autoFocusCallback); } catch (Exception e) { Log.d("DBG", "Error starting camera preview: " + e.getMessage()); } } }