2a8a237a97
There was no need to completely change our implementation and remove the top and bottom text views
368 lines
12 KiB
Java
368 lines
12 KiB
Java
package org.cloudsky.cordovaPlugins;
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import java.io.IOException;
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import java.lang.RuntimeException;
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import org.json.JSONException;
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import org.json.JSONObject;
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import android.app.Activity;
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import android.content.Intent;
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import android.content.res.Resources;
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import android.hardware.Camera;
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import android.hardware.Camera.CameraInfo;
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import android.hardware.Camera.PreviewCallback;
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import android.hardware.Camera.AutoFocusCallback;
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import android.os.Bundle;
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import android.os.Handler;
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import android.util.Log;
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import android.view.Gravity;
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import android.view.SurfaceHolder;
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import android.view.SurfaceView;
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import android.view.View;
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import android.view.ViewGroup;
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import android.widget.FrameLayout;
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import android.widget.TextView;
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import net.sourceforge.zbar.ImageScanner;
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import net.sourceforge.zbar.Image;
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import net.sourceforge.zbar.Symbol;
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import net.sourceforge.zbar.SymbolSet;
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import net.sourceforge.zbar.Config;
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public class ZBarScannerActivity extends Activity
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implements SurfaceHolder.Callback {
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// Config ----------------------------------------------------------
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private static int autoFocusInterval = 500; // Interval between AFcallback and next AF attempt.
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// Public Constants ------------------------------------------------
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public static final String EXTRA_QRVALUE = "qrValue";
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public static final String EXTRA_PARAMS = "params";
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public static final int RESULT_ERROR = RESULT_FIRST_USER + 1;
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// State -----------------------------------------------------------
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private Camera camera;
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private Handler autoFocusHandler;
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private SurfaceView scannerSurface;
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private SurfaceHolder holder;
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private ImageScanner scanner;
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private int surfW, surfH;
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// Customisable stuff
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String whichCamera;
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String flashMode;
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// For retrieving R.* resources, from the actual app package
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// (we can't use actual.application.package.R.* in our code as we
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// don't know the applciation package name when writing this plugin).
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private String package_name;
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private Resources resources;
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// Static initialisers (class) -------------------------------------
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static {
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// Needed by ZBar??
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System.loadLibrary("iconv");
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}
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// Activity Lifecycle ----------------------------------------------
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@Override
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public void onCreate (Bundle savedInstanceState)
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{
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super.onCreate(savedInstanceState);
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// Get parameters from JS
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Intent startIntent = getIntent();
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String paramStr = startIntent.getStringExtra(EXTRA_PARAMS);
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JSONObject params;
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try { params = new JSONObject(paramStr); }
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catch (JSONException e) { params = new JSONObject(); }
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String textTitle = params.optString("text_title");
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String textInstructions = params.optString("text_instructions");
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Boolean drawSight = params.optBoolean("drawSight", true);
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whichCamera = params.optString("camera");
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flashMode = params.optString("flash");
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// Initiate instance variables
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autoFocusHandler = new Handler();
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scanner = new ImageScanner();
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scanner.setConfig(0, Config.X_DENSITY, 3);
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scanner.setConfig(0, Config.Y_DENSITY, 3);
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// Set content view
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setContentView(getResourceId("layout/cszbarscanner"));
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// Update view with customisable strings
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TextView view_textTitle = (TextView) findViewById(getResourceId("id/csZbarScannerTitle"));
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TextView view_textInstructions = (TextView) findViewById(getResourceId("id/csZbarScannerInstructions"));
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view_textTitle.setText(textTitle);
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view_textInstructions.setText(textInstructions);
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// Draw/hide the sight
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if(!drawSight) {
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findViewById(getResourceId("id/csZbarScannerSight")).setVisibility(View.INVISIBLE);
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}
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// Create preview SurfaceView
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scannerSurface = new SurfaceView (this) {
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@Override
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public void onSizeChanged (int w, int h, int oldW, int oldH) {
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surfW = w;
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surfH = h;
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matchSurfaceToPreviewRatio();
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}
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};
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scannerSurface.setLayoutParams(new FrameLayout.LayoutParams(
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ViewGroup.LayoutParams.MATCH_PARENT,
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ViewGroup.LayoutParams.MATCH_PARENT,
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Gravity.CENTER
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));
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scannerSurface.getHolder().addCallback(this);
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// Add preview SurfaceView to the screen
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FrameLayout scannerView = (FrameLayout) findViewById(getResourceId("id/csZbarScannerView"));
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scannerView.addView(scannerSurface);
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findViewById(getResourceId("id/csZbarScannerTitle")).bringToFront();
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findViewById(getResourceId("id/csZbarScannerInstructions")).bringToFront();
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findViewById(getResourceId("id/csZbarScannerSightContainer")).bringToFront();
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findViewById(getResourceId("id/csZbarScannerSight")).bringToFront();
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scannerView.requestLayout();
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scannerView.invalidate();
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}
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@Override
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public void onResume ()
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{
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super.onResume();
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try {
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if(whichCamera.equals("front")) {
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int numCams = Camera.getNumberOfCameras();
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CameraInfo cameraInfo = new CameraInfo();
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for(int i=0; i<numCams; i++) {
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Camera.getCameraInfo(i, cameraInfo);
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if(cameraInfo.facing == CameraInfo.CAMERA_FACING_FRONT) {
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camera = Camera.open(i);
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}
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}
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} else {
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camera = Camera.open();
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}
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if(camera == null) throw new Exception ("Error: No suitable camera found.");
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} catch (RuntimeException e) {
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die("Error: Could not open the camera.");
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return;
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} catch (Exception e) {
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die(e.getMessage());
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return;
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}
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Camera.Parameters camParams = camera.getParameters();
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if(flashMode.equals("on")) {
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camParams.setFlashMode(Camera.Parameters.FLASH_MODE_ON);
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} else if(flashMode.equals("off")) {
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camParams.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
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} else {
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camParams.setFlashMode(Camera.Parameters.FLASH_MODE_AUTO);
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}
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try { camera.setParameters(camParams); }
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catch (RuntimeException e) {
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Log.d("csZBar", "Unsupported camera parameter reported for flash mode: "+flashMode);
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}
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tryStartPreview();
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}
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@Override
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public void onPause ()
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{
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releaseCamera();
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super.onPause();
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}
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@Override
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public void onDestroy ()
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{
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scanner.destroy();
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super.onDestroy();
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}
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// Event handlers --------------------------------------------------
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@Override
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public void onBackPressed ()
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{
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setResult(RESULT_CANCELED);
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super.onBackPressed();
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}
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// SurfaceHolder.Callback implementation ---------------------------
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@Override
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public void surfaceCreated (SurfaceHolder hld)
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{
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tryStopPreview();
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holder = hld;
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tryStartPreview();
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}
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@Override
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public void surfaceDestroyed (SurfaceHolder holder)
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{
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// No surface == no preview == no point being in this Activity.
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die("The camera surface was destroyed");
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}
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@Override
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public void surfaceChanged (SurfaceHolder hld, int fmt, int w, int h)
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{
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// Sanity check - holder must have a surface...
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if(hld.getSurface() == null) die("There is no camera surface");
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surfW = w;
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surfH = h;
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matchSurfaceToPreviewRatio();
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tryStopPreview();
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holder = hld;
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tryStartPreview();
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}
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// Continuously auto-focus -----------------------------------------
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private AutoFocusCallback autoFocusCb = new AutoFocusCallback()
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{
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public void onAutoFocus(boolean success, Camera camera) {
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autoFocusHandler.postDelayed(doAutoFocus, autoFocusInterval);
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}
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};
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private Runnable doAutoFocus = new Runnable()
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{
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public void run() {
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if(camera != null) camera.autoFocus(autoFocusCb);
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}
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};
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// Camera callbacks ------------------------------------------------
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// Receives frames from the camera and checks for barcodes.
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private PreviewCallback previewCb = new PreviewCallback()
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{
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public void onPreviewFrame(byte[] data, Camera camera) {
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Camera.Parameters parameters = camera.getParameters();
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Camera.Size size = parameters.getPreviewSize();
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Image barcode = new Image(size.width, size.height, "Y800");
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barcode.setData(data);
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if (scanner.scanImage(barcode) != 0) {
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String qrValue = "";
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SymbolSet syms = scanner.getResults();
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for (Symbol sym : syms) {
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qrValue = sym.getData();
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// Return 1st found QR code value to the calling Activity.
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Intent result = new Intent ();
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result.putExtra(EXTRA_QRVALUE, qrValue);
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setResult(Activity.RESULT_OK, result);
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finish();
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}
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}
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}
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};
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// Misc ------------------------------------------------------------
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// finish() due to error
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private void die (String msg)
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{
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setResult(RESULT_ERROR);
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finish();
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}
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private int getResourceId (String typeAndName)
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{
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if(package_name == null) package_name = getApplication().getPackageName();
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if(resources == null) resources = getApplication().getResources();
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return resources.getIdentifier(typeAndName, null, package_name);
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}
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// Release the camera resources and state.
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private void releaseCamera ()
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{
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if (camera != null) {
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autoFocusHandler.removeCallbacks(doAutoFocus);
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camera.setPreviewCallback(null);
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camera.release();
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camera = null;
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}
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}
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// Match the aspect ratio of the preview SurfaceView with the camera's preview aspect ratio,
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// so that the displayed preview is not stretched/squashed.
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private void matchSurfaceToPreviewRatio () {
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if(camera == null) return;
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if(surfW == 0 || surfH == 0) return;
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// Resize SurfaceView to match camera preview ratio (avoid stretching).
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Camera.Parameters params = camera.getParameters();
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Camera.Size size = params.getPreviewSize();
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float previewRatio = (float) size.height / size.width; // swap h and w as the preview is rotated 90 degrees
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float surfaceRatio = (float) surfW / surfH;
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if(previewRatio > surfaceRatio) {
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scannerSurface.setLayoutParams(new FrameLayout.LayoutParams(
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surfW,
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Math.round((float) surfW / previewRatio),
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Gravity.CENTER
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));
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} else if(previewRatio < surfaceRatio) {
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scannerSurface.setLayoutParams(new FrameLayout.LayoutParams(
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Math.round((float) surfH * previewRatio),
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surfH,
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Gravity.CENTER
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));
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}
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}
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// Stop the camera preview safely.
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private void tryStopPreview () {
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// Stop camera preview before making changes.
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try {
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camera.stopPreview();
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} catch (Exception e){
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// Preview was not running. Ignore the error.
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}
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}
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// Start the camera preview if possible.
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// If start is attempted but fails, exit with error message.
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private void tryStartPreview () {
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if(holder != null) {
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try {
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// 90 degrees rotation for Portrait orientation Activity.
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camera.setDisplayOrientation(90);
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camera.setPreviewDisplay(holder);
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camera.setPreviewCallback(previewCb);
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camera.startPreview();
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camera.autoFocus(autoFocusCb); // We are not using any of the
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// continuous autofocus modes as that does not seem to work
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// well with flash setting of "on"... At least with this
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// simple and stupid focus method, we get to turn the flash
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// on during autofocus.
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} catch (IOException e) {
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die("Could not start camera preview: " + e.getMessage());
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}
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}
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}
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}
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