Android studio 手机扫描二维码功能

版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。

本文链接： https://blog.csdn.net/le9406/article/details/102682627

 安卓手机版本在6.0以后需要动态获取相机权限

1.获取相机权限

<!-- 获取手机相机的权限 -->
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-permission android:name="android.permission.FLASHLIGHT" />

2.添加依赖

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

3.activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_gravity="center"
    android:layout_height="wrap_content">

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="开启相机扫描"
        android:id="@+id/btn"
        />
</LinearLayout>

4.MainActivity.java

package com.example.a86156.saomiao;

import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Build;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
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 {
    Button btn;

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

        //隐藏系统默认的标题
        ActionBar actionBar = getSupportActionBar();
        if(actionBar!=null){
            actionBar.hide();
        }

        //初始化相机权限
        ZXingLibrary.initDisplayOpinion(this);

        btn = findViewById(R.id.btn);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                //先判断手机版本是否在6.0以上，如果在6.0以上则需要动态申请权限
                if (Build.VERSION.SDK_INT > 22) {
                    if (ContextCompat.checkSelfPermission(MainActivity.this,
                            android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
                        //先判断有没有权限 ，没有就在这里进行权限的申请
                        ActivityCompat.requestPermissions(MainActivity.this,
                                new String[]{android.Manifest.permission.CAMERA}, 1);
                    } else {
                        //说明已经获取到摄像头权限了 想干嘛干嘛
                        Intent intent = new Intent(MainActivity.this, CaptureActivity.class);
                        startActivityForResult(intent, 1);
                    }
                } else {
                    //这个说明系统版本在6.0之下，不需要动态获取权限。
                    Intent intent = new Intent(MainActivity.this, CaptureActivity.class);
                    startActivityForResult(intent, 1);
                }
            }
        });

    }

    //获取手机相机权限
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == 1) {
            if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                Intent intent = new Intent(this, CaptureActivity.class);
                startActivityForResult(intent, 1);
            } else {
                Toast.makeText(MainActivity.this, "请打开相机权限", Toast.LENGTH_SHORT).show();
            }
        }
    }

    //处理扫描结果
    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (resultCode == RESULT_OK) {
            if (data != null) {
                Bundle bundle = data.getExtras();
                if (bundle == null) {
                    return;
                }
                if (bundle.getInt(CodeUtils.RESULT_TYPE) == CodeUtils.RESULT_SUCCESS) {
                    //获取到扫描的结果
                   String result = bundle.getString(CodeUtils.RESULT_STRING);
                    Log.d("res:",result);
                }
            }
        }
    }




}