Android studio realizes the function of scanning two dimensional code by mobile phone
- 2021-11-13 02:50:58
- OfStack
Android mobile phone version needs to dynamically obtain camera rights after 6.0
1. Get camera permissions
<!-- Get the permissions of mobile phone camera -->
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.FLASHLIGHT" />
2. Add dependencies
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=" Turn on camera scanning "
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);
// Hide the system default title
ActionBar actionBar = getSupportActionBar();
if(actionBar!=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 judge whether the mobile phone version is in 6.0 Above, if in 6.0 The above requires dynamic application permission
if (Build.VERSION.SDK_INT > 22) {
if (ContextCompat.checkSelfPermission(MainActivity.this,
android.Manifest.permission.CAMERA) != PackageManager.PERMISSION_GRANTED) {
// Judge whether you have permission first There is no application for permission here
ActivityCompat.requestPermissions(MainActivity.this,
new String[]{android.Manifest.permission.CAMERA}, 1);
} else {
// It means that the camera permission has been obtained Do whatever you want
Intent intent = new Intent(MainActivity.this, CaptureActivity.class);
startActivityForResult(intent, 1);
}
} else {
// This explains that the system version is in the 6.0 There is no need to dynamically obtain permissions.
Intent intent = new Intent(MainActivity.this, CaptureActivity.class);
startActivityForResult(intent, 1);
}
}
});
}
// Get mobile phone camera permissions
@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();
}
}
}
// Processing 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 results of the scan
String result = bundle.getString(CodeUtils.RESULT_STRING);
Log.d("res:",result);
}
}
}
}
}
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