1 files changed, 108 insertions, 0 deletions
diff --git a/android/examples/CameraTest/src/net/sourceforge/zbar/android/CameraTest/CameraPreview.java b/android/examples/CameraTest/src/net/sourceforge/zbar/android/CameraTest/CameraPreview.java
new file mode 100644
index 0000000..41efe68
--- /dev/null
+++ b/android/examples/CameraTest/src/net/sourceforge/zbar/android/CameraTest/CameraPreview.java
@@ -0,0 +1,108 @@
+/*
+ * Barebones implementation of displaying camera preview.
+ *
+ * Created by lisah0 on 2012-02-24
+ */
+package net.sourceforge.zbar.android.CameraTest;
+
+import java.io.IOException;
+
+import android.app.Activity;
+import android.os.Bundle;
+
+import android.util.Log;
+
+import android.view.View;
+import android.view.Surface;
+import android.view.SurfaceView;
+import android.view.SurfaceHolder;
+
+import android.content.Context;
+
+import android.hardware.Camera;
+import android.hardware.Camera.PreviewCallback;
+import android.hardware.Camera.AutoFocusCallback;
+import android.hardware.Camera.Parameters;
+
+/** 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;
+
+    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());
+        }
+    }
+}