Android之二维码生成与扫描

-----------------转载请注明出处：http://blog.csdn.net/android_cll

-----------------都有注释我就不用说得太清楚，我就贴一下实现步骤和源码，不懂得可以下载源码自己看、

一：效果图：







二：实现步骤：

1.导入第三方架包，下载地址：

http://download.csdn.net/detail/android_cll/9784977

2.在项目build.gradle文件下加入相应的包、

compile 'cn.yipianfengye.android:zxing-library:2.1'

3.一个图片的Util工具类、

package com.uuch.android_zxinglibrary;

import android.annotation.TargetApi;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;

/**
* 文 件 名: ImageUtil
* 创 建 人: 曹刘浪
* 创建日期: 2017-3-18 12:12
*/

public class ImageUtil {
/**
* 根据Uri获取图片绝对路径，解决Android4.4以上版本Uri转换
*
* @param context
* @param imageUri
*/
@TargetApi(19)
public static String getImageAbsolutePath(Context context, Uri imageUri) {
if (context == null || imageUri == null)
return null;
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.KITKAT && DocumentsContract.isDocumentUri(context, imageUri)) {
if (isExternalStorageDocument(imageUri)) {
String docId = DocumentsContract.getDocumentId(imageUri);
String[] split = docId.split(":");
String type = split[0];
if ("primary".equalsIgnoreCase(type)) {
return Environment.getExternalStorageDirectory() + "/" + split[1];
}
} else if (isDownloadsDocument(imageUri)) {
String id = DocumentsContract.getDocumentId(imageUri);
Uri contentUri = ContentUris.withAppendedId(Uri.parse("content://downloads/public_downloads"), Long.valueOf(id));
return getDataColumn(context, contentUri, null, null);
} else if (isMediaDocument(imageUri)) {
String docId = DocumentsContract.getDocumentId(imageUri);
String[] split = docId.split(":");
String type = split[0];
Uri contentUri = null;
if ("image".equals(type)) {
contentUri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

4000
} else if ("video".equals(type)) {
contentUri = MediaStore.Video.Media.EXTERNAL_CONTENT_URI;
} else if ("audio".equals(type)) {
contentUri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
}
String selection = MediaStore.Images.Media._ID + "=?";
String[] selectionArgs = new String[]{split[1]};
return getDataColumn(context, contentUri, selection, selectionArgs);
}
} // MediaStore (and general)
else if ("content".equalsIgnoreCase(imageUri.getScheme())) {
// Return the remote address
if (isGooglePhotosUri(imageUri))
return imageUri.getLastPathSegment();
return getDataColumn(context, imageUri, null, null);
}
// File
else if ("file".equalsIgnoreCase(imageUri.getScheme())) {
return imageUri.getPath();
}
return null;
}

public static String getDataColumn(Context context, Uri uri, String selection, String[] selectionArgs) {
Cursor cursor = null;
String column = MediaStore.Images.Media.DATA;
String[] projection = {column};
try {
cursor = context.getContentResolver().query(uri, projection, selection, selectionArgs, null);
if (cursor != null && cursor.moveToFirst()) {
int index = cursor.getColumnIndexOrThrow(column);
return cursor.getString(index);
}
} finally {
if (cursor != null)
cursor.close();
}
return null;
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is ExternalStorageProvider.
*/
public static boolean isExternalStorageDocument(Uri uri) {
return "com.android.externalstorage.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is DownloadsProvider.
*/
public static boolean isDownloadsDocument(Uri uri) {
return "com.android.providers.downloads.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is MediaProvider.
*/
public static boolean isMediaDocument(Uri uri) {
return "com.android.providers.media.documents".equals(uri.getAuthority());
}

/**
* @param uri The Uri to check.
* @return Whether the Uri authority is Google Photos.
*/
public static boolean isGooglePhotosUri(Uri uri) {
return "com.google.android.apps.photos.content".equals(uri.getAuthority());
}
}

4.第一个界面的xml、

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent">

<Button
android:id="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_marginTop="20dp"
android:background="#ff0000"
android:text="二维码扫描"
android:textColor="#fff" />

<Button
android:id="@+id/button4"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/button1"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_marginTop="20dp"
android:background="#ff0000"
android:text="二维码生成"
android:textColor="#fff" />

</RelativeLayout>

5.MainActivity、

package com.uuch.android_zxinglibrary;

import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.uuzuche.lib_zxing.activity.CaptureActivity;
import com.uuzuche.lib_zxing.activity.CodeUtils;

import java.util.List;

import pub.devrel.easypermissions.AfterPermissionGranted;
import pub.devrel.easypermissions.AppSettingsDialog;
import pub.devrel.easypermissions.EasyPermissions;

public class MainActivity extends Activity implements EasyPermissions.PermissionCallbacks{

/**
* 扫描跳转Activity RequestCode
*/
public static final int REQUEST_CODE = 111;
/**
* 选择系统图片Request Code
*/
public static final int REQUEST_IMAGE = 112;

public Button button1 = null;
public Button button4 = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

/**
* 初始化组件
*/
initView();
}

/**
* 初始化组件
*/
private void initView() {
button1 = (Button) findViewById(R.id.button1);
button4 = (Button) findViewById(R.id.button4);
/**
* 二维码扫描界面
*
*
* 生成二维码图片
*/
button1.setOnClickListener(new ButtonOnClickListener(button1.getId()));
button4.setOnClickListener(new ButtonOnClickListener(button4.getId()));
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
/**
* 处理二维码扫描结果
*/
if (requestCode == REQUEST_CODE) {
//处理扫描结果（在界面上显示）
if (null != data) {
Bundle bundle = data.getExtras();
if (bundle == null) {
return;
}
if (bundle.getInt(CodeUtils.RESULT_TYPE) == CodeUtils.RESULT_SUCCESS) {
String result = bundle.getString(CodeUtils.RESULT_STRING);
Toast.makeText(this, "解析结果:" + result, Toast.LENGTH_LONG).show();
} else if (bundle.getInt(CodeUtils.RESULT_TYPE) == CodeUtils.RESULT_FAILED) {
Toast.makeText(MainActivity.this, "解析二维码失败", Toast.LENGTH_LONG).show();
}
}
}

/**
* 选择系统图片并解析
*/
else if (requestCode == REQUEST_IMAGE) {
if (data != null) {
Uri uri = data.getData();
try {
CodeUtils.analyzeBitmap(ImageUtil.getImageAbsolutePath(this, uri), new CodeUtils.AnalyzeCallback() {
@Override
public void onAnalyzeSuccess(Bitmap mBitmap, String result) {
Toast.makeText(MainActivity.this, "解析结果:" + result, Toast.LENGTH_LONG).show();
}

@Override
public void onAnalyzeFailed() {
Toast.makeText(MainActivity.this, "解析二维码失败", Toast.LENGTH_LONG).show();
}
});
} catch (Exception e) {
e.printStackTrace();
}
}
}

else if (requestCode == REQUEST_CAMERA_PERM) {
Toast.makeText(this, "从设置页面返回...", Toast.LENGTH_SHORT)
.show();
}
}

/**
* 请求CAMERA权限码
*/
public static final int REQUEST_CAMERA_PERM = 101;

/**
* EsayPermissions接管权限处理逻辑
* @param requestCode
* @param permissions
* @param grantResults
*/
@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);

// Forward results to EasyPermissions
EasyPermissions.onRequestPermissionsResult(requestCode, permissions, grantResults, this);
}

@AfterPermissionGranted(REQUEST_CAMERA_PERM)
public void cameraTask(int viewId) {
if (EasyPermissions.hasPermissions(this, Manifest.permission.CAMERA)) {
// Have permission, do the thing!
onClick(viewId);
} else {
// Ask for one permission
EasyPermissions.requestPermissions(this, "需要请求camera权限",
REQUEST_CAMERA_PERM, Manifest.permission.CAMERA);
}
}

@Override
public void onPermissionsGranted(int requestCode, List<String> perms) {
Toast.makeText(this, "执行onPermissionsGranted()...", Toast.LENGTH_SHORT).show();
}

@Override
public void onPermissionsDenied(int requestCode, List<String> perms) {
Toast.makeText(this, "执行onPermissionsDenied()...", Toast.LENGTH_SHORT).show();
if (EasyPermissions.somePermissionPermanentlyDenied(this, perms)) {
new AppSettingsDialog.Builder(this, "当前App需要申请camera权限,需要打开设置页面么?")
.setTitle("权限申请")
.setPositiveButton("确认")
.setNegativeButton("取消", null /* click listener */)
.setRequestCode(REQUEST_CAMERA_PERM)
.build()
.show();
}
}

/**
* 按钮点击监听
*/
class ButtonOnClickListener implements View.OnClickListener{

private int buttonId;

public ButtonOnClickListener(int buttonId) {
this.buttonId = buttonId;
}

@Override
public void onClick(View v) {
if (v.getId() == R.id.button4) {
Intent intent = new Intent(MainActivity.this, ThreeActivity.class);
startActivity(intent);
} else {
cameraTask(buttonId);
}
}
}

/**
* 按钮点击事件处理逻辑
* @param buttonId
*/
private void onClick(int buttonId) {
switch (buttonId) {
case R.id.button1:
Intent intent = new Intent(getApplication(), CaptureActivity.class);
startActivityForResult(intent, REQUEST_CODE);
break;
default:
break;
}
}
}

6.二维码生成界面的xml、

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fitsSystemWindows="true">

<EditText
android:id="@+id/edit_content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_marginTop="20dp"
android:minLines="3" />

<Button
android:id="@+id/button_content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/edit_content"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_marginTop="20dp"
android:text="生成logo二维码图片"
android:visibility="gone" />

<Button
android:id="@+id/button1_content"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/button_content"
android:layout_marginLeft="20dp"
android:layout_marginRight="20dp"
android:layout_marginTop="20dp"
android:text="生成普通二维码图片" />

<ImageView
android:id="@+id/image_content"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/button1_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="20dp" />

</RelativeLayout>

7.二维码生成ThreeActivity、

package com.uuch.android_zxinglibrary;

import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

import com.uuzuche.lib_zxing.activity.CodeUtils;

public class ThreeActivity extends Activity {

public EditText editText = null;
public Button button1 = null;
public ImageView imageView = null;

public Bitmap mBitmap = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_three);

initView();
}

/**
* 初始化组件
*/
private void initView() {

editText = (EditText) findViewById(R.id.edit_content);
button1 = (Button) findViewById(R.id.button1_content);
imageView = (ImageView) findViewById(R.id.image_content);

/**
* 生成不带logo的二维码图片
*/
button1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {

String textContent = editText.getText().toString();
if (TextUtils.isEmpty(textContent)) {
Toast.makeText(ThreeActivity.this, "您的输入为空!", Toast.LENGTH_SHORT).show();
return;
}
editText.setText("");
mBitmap = CodeUtils.createImage(textContent, 400, 400, null);
imageView.setImageBitmap(mBitmap);
}
});
}

}

8.去AppLication初始化、

package com.uuch.android_zxinglibrary;

import android.app.Application;

import com.uuzuche.lib_zxing.activity.ZXingLibrary;

public class MApplication extends Application{

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

ZXingLibrary.initDisplayOpinion(this);
}
}

9.在AndroidManifest.xml文件中加上权限、

<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.FLASHLIGHT" />

<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />

<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.INTERNET" />

------------------------到这应该都已经写完了这个功能，大神勿喷，不会的或者想节约时间的可以下载源码、

源码地址：http://download.csdn.net/detail/android_cll/9785625