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"><Buttonandroid: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;@Overrideprotected 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() {@Overridepublic 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@Overridepublic 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@Overrideprotected 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);}}}}}