How to realize the function of scanning QR Code on Mobile phone by Androidstudio

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Android phone version needs to obtain camera permission dynamically after 6.0.

1. Get camera permission

two。 Add dependency

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

3.activity_main.xml

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); / / hide the system default title ActionBar actionBar = getSupportActionBar (); if (actionBarrack permission null) {actionBar.hide ();} / initialize camera permissions ZXingLibrary.initDisplayOpinion (this) Btn = findViewById (R.id.btn) Btn.setOnClickListener (new View.OnClickListener () {@ Override public void onClick (View v) {/ / first determines whether the mobile phone version is above 6.0.If it is above 6.0, you need to dynamically apply for permission if (Build.VERSION.SDK_INT > 22) {if (ContextCompat.checkSelfPermission (MainActivity.this, android.Manifest.permission.CAMERA)! = PackageManager.PERMISSION_GRANTED) {/ / determine whether you have permission or not. There is no application for ActivityCompat.requestPermissions (MainActivity.this, new String [] {android.Manifest.permission.CAMERA}, 1) for permission here. } else {/ / indicates that you have obtained the camera permission. What do you want to do? Intent intent = new Intent (MainActivity.this, CaptureActivity.class); startActivityForResult (intent, 1);}} else {/ / this indicates that the system version is under 6.0.There is no need to obtain permission dynamically. Intent intent = new Intent (MainActivity.this, CaptureActivity.class); startActivityForResult (intent, 1);} / / access to mobile camera @ 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, "Please open camera permissions", Toast.LENGTH_SHORT). Show ();} / / process scan results @ 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) {/ / get the scan result String result = bundle.getString (CodeUtils.RESULT_STRING); Log.d ("res:", result);}}

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