扫描二维码---第三方

布局一个button’按钮

MainActivity

package wanghuiqi.bawie.com.qr_code;

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.Toast;

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

public class MainActivity extends AppCompatActivity {

    private Button mQrCode;
    private int REQUEST_CODE=1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mQrCode = findViewById(R.id.QR_code);

        ZXingLibrary.initDisplayOpinion(this);

        //打开默认扫描二维码页面
        mQrCode.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(MainActivity.this,CaptureActivity.class);
                startActivityForResult(intent,REQUEST_CODE);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        //处理二维码扫描结果
        if (requestCode==REQUEST_CODE){
            //处理扫描结果（在页面上显示）
            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(MainActivity.this , "解析结果："+result, Toast.LENGTH_SHORT).show();
                }else if(bundle.getInt(CodeUtils.RESULT_TYPE)==CodeUtils.RESULT_FAILED){
                    Toast.makeText(MainActivity.this, "解析二维码失败", Toast.LENGTH_SHORT).show();
                }
            }
        }
    }
}

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" />

依赖

compile 'cn.yipianfengye.android:zxing-library:2.2'