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   源码介绍

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package com.example.xch.scanzxing;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.example.xch.scanzxing.zxing.android.CaptureActivity;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    private static final String DECODED_CONTENT_KEY = "codedContent";
    private static final String DECODED_BITMAP_KEY = "codedBitmap";
    private static final int REQUEST_CODE_SCAN = 0x0000;

    private Button btn_scan;
    private TextView tv_scanResult;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv_scanResult = (TextView) findViewById(R.id.tv_scanResult);
        btn_scan = (Button) findViewById(R.id.btn_scan);
        btn_scan.setOnClickListener(this);
    }


    @Override
    public void onClick(View v) {
        switch (v.getId()) {
            case R.id.btn_scan:
                //动态权限申请
                if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                    ActivityCompat.requestPermissions(MainActivity.this, new String[]{Manifest.permission.CAMERA}, 1);
                } else {
                    goScan();
                }
                break;
            default:
                break;
        }
    }

    /**
     * 跳转到扫码界面扫码
     */
    private void goScan(){
        Intent intent = new Intent(MainActivity.this, CaptureActivity.class);
        startActivityForResult(intent, REQUEST_CODE_SCAN);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode) {
            case 1:
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    goScan();
                } else {
                    Toast.makeText(this, "你拒绝了权限申请，可能无法打开相机扫码哟！", Toast.LENGTH_SHORT).show();
                }
                break;
            default:
        }
    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        // 扫描二维码/条码回传
        if (requestCode == REQUEST_CODE_SCAN && resultCode == RESULT_OK) {
            if (data != null) {
                //返回的文本内容
                String content = data.getStringExtra(DECODED_CONTENT_KEY);
                //返回的BitMap图像
                Bitmap bitmap = data.getParcelableExtra(DECODED_BITMAP_KEY);

                tv_scanResult.setText("你扫描到的内容是："   content);
            }
        }
    }
}