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 dswitkin@google.com (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<BarcodeFormat> decodeFormats;
private Map<DecodeHintType, ?> 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

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.administrator.scanoo.MainActivity">

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">

<TextView
android:id="@+id/scanResult"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Hello World!"
android:textColor="#f00"
android:textSize="20sp" />

<ImageView
android:id="@+id/scanimage"
android:layout_width="300dp"
android:layout_height="300dp"
android:layout_gravity="center" />

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_gravity="center"
android:text="测试扫码" />
</LinearLayout>

</RelativeLayout>

capture.xml

<?xml version="1.0" encoding="UTF-8"?><!--
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.
-->
<merge xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools">

<SurfaceView
android:id="@+id/preview_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />

<com.google.zxing.client.android.ViewfinderView
android:id="@+id/viewfinder_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />

<TextView
android:id="@+id/status_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|center_horizontal"
android:background="@color/transparent"
android:text="@string/msg_default_status"
android:textColor="@color/status_text" />

</merge>

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！