集成ZXing完美适配各种机型实现扫一扫~

首先国际惯例 直接加依赖

compile ‘cn.yipianfengye.android:zxing-library:1.8’

而后直接撸代码，我相信你能看懂，很简单的。

package XX.XX.XX;

import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Environment;
import android.provider.DocumentsContract;
import android.provider.MediaStore;
import android.support.v7.app.AppCompatActivity;
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;

public class MainActivity extends AppCompatActivity {
Button btn1;
Button btn2;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    btn1 = (Button) findViewById(R.id.btn1);
    btn2 = (Button) findViewById(R.id.btn2);
    //直接扫描
    btn1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(MainActivity.this, CaptureActivity.class);
            startActivityForResult(intent, 1);
        }
    });
    //从图库中扫描
    btn2.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            Intent intent = new Intent(Intent.ACTION_GET_CONTENT);
            intent.addCategory(Intent.CATEGORY_OPENABLE);
            intent.setType("image/*");
            startActivityForResult(intent, 2);
        }
    });
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == 1) {
        //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();
            }
        }
    } else if (requestCode == 2) {
        if (data != null) {
            Uri uri = data.getData();
            ContentResolver cr = getContentResolver();
            try {
                Bitmap mBitmap = MediaStore.Images.Media.getBitmap(cr, uri);//显得到bitmap图片
                String imagePath = getImageAbsolutePath(MainActivity.this, uri);
                CodeUtils.analyzeBitmap(imagePath, 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();
                    }
                });

                if (mBitmap != null) {
                    mBitmap.recycle();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

//根据打开相册返回的uri获取绝对路径 兼容不同版本
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;
            } 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;
}

private 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());
}

}