android扫描二维码（zxing）附带小例子

android扫描二维码（zxing）附带小例子

开发android二维码的功能基本上是必须的了。下面的android小程序，主要实现了这样的一个功能，扫描二维码，然后把二维码内容和当时取得照片读出来。

首先需要的是zxing的下载包，这里使用的是3.1.0的下载地址：下载完整版官方例子程序。

参考android的程序，新建一个自己的小例子，把扫描的主要功能实现。这是程序的目录截图：

这里仅仅列出主要的代码：

MainActivity.java

package com.example.administrator.scanoo;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

import org.w3c.dom.Text;

public class MainActivity extends AppCompatActivity {
    private Button button;
    private TextView textView;
    private ImageView imageView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        button = (Button) this.findViewById(R.id.button1);
        textView = (TextView)this.findViewById(R.id.scanResult);
        imageView = (ImageView)this.findViewById(R.id.scanimage);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this, CaptureActivity.class);
                startActivityForResult(intent, 0x123);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == 0x123 && resultCode==0x345){
            if(data != null){
                textView.setText("扫描结果:\n" + data.getStringExtra("resultCode"));
                imageView.setImageBitmap(TransData.bitmap);
            }
        }
    }
}

CaptureActivity.java

/*
 * 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.example.administrator.scanoo;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.os.Bundle;
import android.os.Handler;
import android.preference.PreferenceManager;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.Window;
import android.view.WindowManager;
import android.widget.TextView;
import android.widget.Toast;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.DecodeHintType;
import com.google.zxing.Result;
import com.google.zxing.ResultPoint;
import com.google.zxing.client.android.AmbientLightManager;
import com.google.zxing.client.android.BeepManager;
import com.google.zxing.client.android.CaptureActivityHandler;
import com.google.zxing.client.android.FinishListener;
import com.google.zxing.client.android.InactivityTimer;
import com.google.zxing.client.android.ViewfinderView;
import com.google.zxing.client.android.camera.CameraManager;

import java.io.IOException;
import java.util.Collection;
import java.util.Map;

/**
 * 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 [email protected] (Daniel Switkin)
 * @author Sean Owen
 */
public final class CaptureActivity extends Activity implements
        SurfaceHolder.Callback {

    private static final String TAG = CaptureActivity.class.getSimpleName();
    private static final long BULK_MODE_SCAN_DELAY_MS = 1000L;
    private CameraManager cameraManager;
    private CaptureActivityHandler handler;
    private ViewfinderView viewfinderView;

    private boolean hasSurface;
    private Collection decodeFormats;
    private Map decodeHints;
    private String characterSet;
    private InactivityTimer inactivityTimer;
    private BeepManager beepManager;
    private AmbientLightManager ambientLightManager;

    public ViewfinderView getViewfinderView() {
        return viewfinderView;
    }

    public Handler getHandler() {
        return handler;
    }

    public CameraManager getCameraManager() {
        return cameraManager;
    }

    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);

        Window window = getWindow();
        window.addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        setContentView(R.layout.capture);

        hasSurface = false;
        inactivityTimer = new InactivityTimer(this);
        beepManager = new BeepManager(this);
        ambientLightManager = new AmbientLightManager(this);

        PreferenceManager.setDefaultValues(this, R.xml.preferences, false);
    }

    @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;

        //设置横屏竖屏
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_PORTRAIT);

        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);
        }

        beepManager.updatePrefs();
        ambientLightManager.start(cameraManager);

        inactivityTimer.onResume();
        decodeFormats = null;
        characterSet = null;
    }

    @Override
    protected void onPause() {
        if (handler != null) {
            handler.quitSynchronously();
            handler = null;
        }
        inactivityTimer.onPause();
        ambientLightManager.stop();
        beepManager.close();
        cameraManager.closeDriver();
        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();
    }

    @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();
        boolean fromLiveScan = barcode != null;
        if (fromLiveScan) {
            // Then not from history, so beep/vibrate and we have an image to
            // draw on
            beepManager.playBeepSoundAndVibrate();
            Toast.makeText(CaptureActivity.this, rawResult.getText(), Toast.LENGTH_SHORT).show();
            //开启下面的能够进行持续扫描
//            restartPreviewAfterDelay(BULK_MODE_SCAN_DELAY_MS);


            Intent intent = new Intent();
            intent.putExtra("resultCode",rawResult.getText());
            TransData.bitmap = barcode;
            setResult(0x345,intent);
            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);
            }
        } 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);
        }
    }

    public void drawViewfinder() {
        viewfinderView.drawViewfinder();
    }
}

TransData.java

package com.example.administrator.scanoo;

import android.graphics.Bitmap;

/**
 * Created by Administrator on 2016/9/19.
 */
//防止图片过大，不能进行界面间传递
public class TransData {
    public static Bitmap bitmap;
}

布局：

activity_main.xml

capture.xml

运行效果截图：

最后，附上整个代码：点我下载，不要你的积分噢！