Java tutorial
/* * Copyright (C) 2008 ZXing authors * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package com.google.zxing.demo; import java.io.IOException; import java.util.Collection; import java.util.EnumSet; import java.util.Map; import org.json.JSONException; import org.json.JSONObject; import android.app.Activity; import android.app.AlertDialog; import android.content.Intent; import android.graphics.Bitmap; import android.os.Build; import android.os.Bundle; import android.os.Handler; import android.text.TextUtils; import android.util.Log; import android.view.KeyEvent; import android.view.SurfaceHolder; import android.view.SurfaceView; import android.view.View; import android.view.View.OnClickListener; import android.view.Window; import android.view.WindowManager; import android.widget.RelativeLayout; import android.widget.Toast; import com.google.zxing.core.BarcodeFormat; import com.google.zxing.core.DecodeHintType; import com.google.zxing.core.Result; import com.google.zxing.core.ResultMetadataType; import com.google.zxing.core.client.result.ParsedResultType; import com.google.zxing.demo.camera.CameraManager; import com.google.zxing.demo.endecode.FinishListener; import com.google.zxing.demo.module.QRCodeTypeDefine; import com.google.zxing.demo.view.ViewfinderView; import com.google.zxing.demo.widge.SystemBarTintManager; import com.micen.focusqrcode.R; /** * This activity opens the camera and does the actual scanning on a background thread. It draws a * viewfinder to help the user place the barcode correctly, shows feedback as the image processing * is happening, and then overlays the results when a scan is successful. * * @author dswitkin@google.com (Daniel Switkin) * @author Sean Owen */ public final class CaptureActivity extends Activity implements SurfaceHolder.Callback, OnClickListener { private static final String TAG = CaptureActivity.class.getSimpleName(); private static final long DEFAULT_INTENT_RESULT_DURATION_MS = 1500L; private static final long BULK_MODE_SCAN_DELAY_MS = 1000L; private static final String[] ZXING_URLS = { "http://zxing.appspot.com/scan", "zxing://scan/" }; public static final int HISTORY_REQUEST_CODE = 0x0000bacc; private static final Collection<ResultMetadataType> DISPLAYABLE_METADATA_TYPES = EnumSet.of( ResultMetadataType.ISSUE_NUMBER, ResultMetadataType.SUGGESTED_PRICE, ResultMetadataType.ERROR_CORRECTION_LEVEL, ResultMetadataType.POSSIBLE_COUNTRY); private CameraManager cameraManager; private CaptureActivityHandler handler; private Result savedResultToShow; private ViewfinderView viewfinderView; private Result lastResult; private boolean hasSurface; private String sourceUrl; private Collection<BarcodeFormat> decodeFormats; private Map<DecodeHintType, ?> decodeHints; private String characterSet; private InactivityTimer inactivityTimer; private BeepManager beepManager; private RelativeLayout zxingCaptureRlBack; public ViewfinderView getViewfinderView() { return viewfinderView; } public Handler getHandler() { return handler; } public CameraManager getCameraManager() { return cameraManager; } @Override public void onCreate(Bundle icicle) { super.onCreate(icicle); requestWindowFeature(Window.FEATURE_NO_TITLE); Window window = getWindow(); window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON); setContentView(R.layout.activity_zxing_capture); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) { SystemBarTintManager tintManager = new SystemBarTintManager(this); tintManager.setStatusBarTintEnabled(true); tintManager.setStatusBarTintColor(getResources().getColor(R.color.color_333333)); } zxingCaptureRlBack = (RelativeLayout) findViewById(R.id.zxing_capture_rl_back); zxingCaptureRlBack.setOnClickListener(this); zxingCaptureRlBack.setBackgroundResource(R.drawable.bg_common_btn); hasSurface = false; inactivityTimer = new InactivityTimer(this); beepManager = new BeepManager(this); } @Override protected void onResume() { super.onResume(); // CameraManager must be initialized here, not in onCreate(). This is necessary because we don't // want to open the camera driver and measure the screen size if we're going to show the help on // first launch. That led to bugs where the scanning rectangle was the wrong size and partially // off screen. cameraManager = new CameraManager(getApplication()); viewfinderView = (ViewfinderView) findViewById(R.id.viewfinder_view); viewfinderView.setCameraManager(cameraManager); handler = null; lastResult = null; resetStatusView(); beepManager.updatePrefs(); // ambientLightManager.start(cameraManager); inactivityTimer.onResume(); sourceUrl = null; // scanFromWebPageManager = null; decodeFormats = null; characterSet = null; SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view); SurfaceHolder surfaceHolder = surfaceView.getHolder(); if (hasSurface) { // The activity was paused but not stopped, so the surface still exists. Therefore // surfaceCreated() won't be called, so init the camera here. initCamera(surfaceHolder); } else { // Install the callback and wait for surfaceCreated() to init the camera. surfaceHolder.addCallback(this); } } private static boolean isZXingURL(String dataString) { if (dataString == null) { return false; } for (String url : ZXING_URLS) { if (dataString.startsWith(url)) { return true; } } return false; } @Override protected void onPause() { if (handler != null) { handler.quitSynchronously(); handler = null; } inactivityTimer.onPause(); // ambientLightManager.stop(); beepManager.close(); cameraManager.closeDriver(); // historyManager = null; // Keep for onActivityResult if (!hasSurface) { SurfaceView surfaceView = (SurfaceView) findViewById(R.id.preview_view); SurfaceHolder surfaceHolder = surfaceView.getHolder(); surfaceHolder.removeCallback(this); } super.onPause(); } @Override protected void onDestroy() { inactivityTimer.shutdown(); super.onDestroy(); } // TODO @Override public boolean onKeyDown(int keyCode, KeyEvent event) { switch (keyCode) { case KeyEvent.KEYCODE_BACK: finish(); return true; case KeyEvent.KEYCODE_FOCUS: case KeyEvent.KEYCODE_CAMERA: // Handle these events so they don't launch the Camera app return true; } return super.onKeyDown(keyCode, event); } @Override public void surfaceCreated(SurfaceHolder holder) { if (holder == null) { Log.e(TAG, "*** WARNING *** surfaceCreated() gave us a null surface!"); } if (!hasSurface) { hasSurface = true; initCamera(holder); } } @Override public void surfaceDestroyed(SurfaceHolder holder) { hasSurface = false; } @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { } /** * A valid barcode has been found, so give an indication of success and show the results. * * @param rawResult The contents of the barcode. * @param scaleFactor amount by which thumbnail was scaled * @param barcode A greyscale bitmap of the camera data which was decoded. */ public void handleDecode(Result rawResult, Bitmap barcode, float scaleFactor) { inactivityTimer.onActivity(); lastResult = rawResult; if (TextUtils.isEmpty(lastResult.getText())) { Toast.makeText(CaptureActivity.this, R.string.scan_failed, Toast.LENGTH_SHORT).show(); restartPreviewAfterDelay(3000); } else { try { JSONObject object = new JSONObject(rawResult.getText()); if (object.has("isMIC") && object.has("action") && object.has("param")) { if (QRCodeTypeDefine.getValue(QRCodeTypeDefine.isMIC).equals(object.getString("isMIC"))) { JSONObject jsonObject = object.getJSONObject("param"); String action = object.getString("action"); // ParsedResultType.MIC setResult(RESULT_OK, new Intent().putExtra("resultType", ParsedResultType.MIC.toString()) .putExtra("action", action).putExtra("resultContent", jsonObject.toString())); finish(); return; } } else { setResultForText(rawResult); } } catch (JSONException e) { e.printStackTrace(); setResultForText(rawResult); } } } private void setResultForText(Result rawResult) { setResult(RESULT_OK, new Intent().putExtra("resultType", ParsedResultType.TEXT.toString()) .putExtra("resultContent", rawResult.getText())); finish(); } private void initCamera(SurfaceHolder surfaceHolder) { if (surfaceHolder == null) { throw new IllegalStateException("No SurfaceHolder provided"); } if (cameraManager.isOpen()) { Log.w(TAG, "initCamera() while already open -- late SurfaceView callback?"); return; } try { cameraManager.openDriver(surfaceHolder); // Creating the handler starts the preview, which can also throw a RuntimeException. if (handler == null) { handler = new CaptureActivityHandler(this, decodeFormats, decodeHints, characterSet, cameraManager); } // decodeOrStoreSavedBitmap(null, null); } catch (IOException ioe) { Log.w(TAG, ioe); displayFrameworkBugMessageAndExit(); } catch (RuntimeException e) { // Barcode Scanner has seen crashes in the wild of this variety: // java.?lang.?RuntimeException: Fail to connect to camera service Log.w(TAG, "Unexpected error initializing camera", e); displayFrameworkBugMessageAndExit(); } } private void displayFrameworkBugMessageAndExit() { AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setTitle(getString(R.string.app_name)); builder.setMessage(getString(R.string.msg_camera_framework_bug)); builder.setPositiveButton(R.string.button_ok, new FinishListener(this)); builder.setOnCancelListener(new FinishListener(this)); builder.show(); } public void restartPreviewAfterDelay(long delayMS) { if (handler != null) { handler.sendEmptyMessageDelayed(R.id.restart_preview, delayMS); } resetStatusView(); } private void resetStatusView() { // resultView.setVisibility(View.GONE); // statusView.setText(R.string.msg_default_status); // statusView.setVisibility(View.VISIBLE); viewfinderView.setVisibility(View.VISIBLE); lastResult = null; } public void drawViewfinder() { viewfinderView.drawViewfinder(); } @Override public void onClick(View v) { if (R.id.zxing_capture_rl_back == v.getId()) { setResult(RESULT_CANCELED); finish(); } } }