1、新增CaptureFragment

2、将扫码相关逻辑与界面分离，ZXingLite使用更容易扩展。

lib/src/main/java/com/king/zxing/CaptureFragment.java

@@ -0,0 +1,170 @@
+/*
+ * Copyright (C) 2019 Jenly Yu
+ *
+ * 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.king.zxing;
+
+import android.os.Bundle;
+import android.support.annotation.LayoutRes;
+import android.support.annotation.Nullable;
+import android.support.v4.app.Fragment;
+import android.view.LayoutInflater;
+import android.view.SurfaceView;
+import android.view.View;
+import android.view.ViewGroup;
+
+import com.king.zxing.camera.CameraManager;
+
+/**
+ * @author <a href="mailto:jenly1314@gmail.com">Jenly</a>
+ */
+public class CaptureFragment extends Fragment implements OnCaptureCallback {
+
+    public static final String KEY_RESULT = Intents.Scan.RESULT;
+
+    private View mRootView;
+
+    private SurfaceView surfaceView;
+    private ViewfinderView viewfinderView;
+
+    private CaptureHelper mCaptureHelper;
+
+    public static CaptureFragment newInstance() {
+
+        Bundle args = new Bundle();
+        
+        CaptureFragment fragment = new CaptureFragment();
+        fragment.setArguments(args);
+        return fragment;
+    }
+
+
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+        int layoutId = getLayoutId();
+        if(isContentView(layoutId)){
+            mRootView = inflater.inflate(getLayoutId(),container,false);
+        }
+        initUI();
+        return mRootView;
+    }
+
+    /**
+     * 初始化
+     */
+    public void initUI(){
+        surfaceView = mRootView.findViewById(getSurfaceViewId());
+        viewfinderView = mRootView.findViewById(getViewfinderViewId());
+        mCaptureHelper = new CaptureHelper(this,surfaceView,viewfinderView);
+        mCaptureHelper.setOnCaptureCallback(this);
+    }
+
+    /**
+     * 返回true时会自动初始化{@link #mRootView}，返回为false时需自己去通过{@link #setRootView(View)}初始化{@link #mRootView}
+     * @param layoutId
+     * @return 默认返回true
+     */
+    public boolean isContentView(@LayoutRes int layoutId){
+        return true;
+    }
+
+    /**
+     * 布局id
+     * @return
+     */
+    public int getLayoutId(){
+        return R.layout.zxl_capture;
+    }
+
+    /**
+     * {@link ViewfinderView} 的 id
+     * @return
+     */
+    public int getViewfinderViewId(){
+        return R.id.viewfinderView;
+    }
+
+
+    /**
+     * 预览界面{@link #surfaceView} 的id
+     * @return
+     */
+    public int getSurfaceViewId(){
+        return R.id.surfaceView;
+    }
+
+    /**
+     * Get {@link CaptureHelper}
+     * @return {@link #mCaptureHelper}
+     */
+    public CaptureHelper getCaptureHelper(){
+        return mCaptureHelper;
+    }
+
+    /**
+     * Get {@link CameraManager}
+     * @return {@link #mCaptureHelper#getCameraManager()}
+     */
+    public CameraManager getCameraManager(){
+        return mCaptureHelper.getCameraManager();
+    }
+
+    //--------------------------------------------
+
+    public View getRootView() {
+        return mRootView;
+    }
+
+    public void setRootView(View rootView) {
+        this.mRootView = rootView;
+    }
+
+
+    //--------------------------------------------
+
+    @Override
+    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
+        super.onActivityCreated(savedInstanceState);
+        mCaptureHelper.onCreate();
+    }
+
+    @Override
+    public void onResume() {
+        super.onResume();
+        mCaptureHelper.onResume();
+    }
+
+    @Override
+    public void onPause() {
+        super.onPause();
+        mCaptureHelper.onPause();
+    }
+
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+        mCaptureHelper.onDestroy();
+    }
+
+    /**
+     * 接收扫码结果回调
+     * @param result 扫码结果
+     * @return 返回true表示拦截，将不自动执行后续逻辑，为false表示不拦截，默认不拦截
+     */
+    @Override
+    public boolean onResultCallback(String result) {
+        return false;
+    }
+
+}