关于制作二维码和扫一扫功能的实现

package com.example.project;

import android.Manifest;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.graphics.Bitmap;
import android.os.AsyncTask;
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.AppCompatActivity;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.Toast;

import java.lang.ref.WeakReference;

import cn.bingoogolapple.qrcode.zxing.QRCodeEncoder;

public class MainActivity extends AppCompatActivity {

private ImageView imageView;
private EditText editText;

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

    initView();
}

private void initView() {
    imageView = findViewById(R.id.image);
    editText = findViewById(R.id.edit_text);

    findViewById(R.id.select).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            //检查是否版本为6.0以上的
            checkPermission();

        }
    });

    findViewById(R.id.sure).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            createQRCode();
        }
    });
}
//生成二维码
private void createQRCode() {
    QRTask qrTask = new QRTask(this,imageView);
    qrTask.execute(editText.getText().toString());
}
    static class QRTask extends AsyncTask<String,Void,Bitmap> {

    private WeakReference<Context> mContext;
    private WeakReference<ImageView> mImageView;

    public QRTask(Context context,ImageView imageView){
        mContext = new WeakReference<>(context);
        mImageView = new WeakReference<>(imageView);
    }

    @Override
    protected Bitmap doInBackground(String... strings) {

        String str = strings[0];

        if(TextUtils.isEmpty(str))
        {
            return null;
        }
        int size = mContext.get().getResources().getDimensionPixelOffset(R.dimen.qr_code_size);
        return QRCodeEncoder.syncEncodeQRCode(str,size);
    }

    @Override
    protected void onPostExecute(Bitmap bitmap) {
        super.onPostExecute(bitmap);
        if(bitmap!=null)
        {
            mImageView.get().setImageBitmap(bitmap);
        }else{
            Toast.makeText(mContext.get(),"生成失败",Toast.LENGTH_SHORT).show();
        }
    }
}
//判断版本是否为6.0以上
private void checkPermission() {
   if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.M)
    {
        //Toast.makeText(MainActivity.this,"扫一扫",Toast.LENGTH_SHORT).show();
        if(ContextCompat.checkSelfPermission(this,Manifest.permission.CAMERA)!=PackageManager.PERMISSION_GRANTED)
        {
            ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.CAMERA},100);

        }else{
            startActivity(new Intent(MainActivity.this,ScanActivity.class));
        }
    }
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if(requestCode==100&&grantResults[0]==PackageManager.PERMISSION_GRANTED){
        startActivity(new Intent(MainActivity.this,ScanActivity.class));
    }
}

}

package com.example.project;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

import cn.bingoogolapple.qrcode.core.QRCodeView;
import cn.bingoogolapple.qrcode.zxing.ZXingView;

public class ScanActivity extends AppCompatActivity implements QRCodeView.Delegate{

private ZXingView zXingView;

@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.login_activity);

    zXingView = findViewById(R.id.zxingView);
    zXingView.setDelegate(this);
}

@Override
protected void onResume() {
    super.onResume();
    zXingView.startCamera();
    zXingView.startSpotAndShowRect();
    zXingView.openFlashlight();
}

@Override
protected void onStop() {
    super.onStop();
}

@Override
protected void onDestroy() {
    super.onDestroy();
}

@Override
public void onScanQRCodeSuccess(String result) {

    Log.i("TEST","result is"+result);
}

@Override
public void onCameraAmbientBrightnessChanged(boolean isDark) {
    //变暗为true
}

@Override
public void onScanQRCodeOpenCameraError() {
    //打开相机失败
}

}