Android studio 实现手机扫描二维码功能
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); } } } } }
总结
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