安卓开发中使用ZXing生成解析二维码

编码示例

package com.wolf_pan.qrcodesample;

import android.graphics.Bitmap;

import android.graphics.Color;

import android.os.Bundle;

import android.support.annotation.Nullable;

import android.support.v7.app.AppCompatActivity;

import android.util.Log;

import android.view.View;

import android.widget.EditText;

import android.widget.ImageView;

import android.widget.LinearLayout;

import com.google.zxing.BarcodeFormat;

import com.google.zxing.EncodeHintType;

import com.google.zxing.WriterException;

import com.google.zxing.common.BitMatrix;

import com.google.zxing.qrcode.QRCodeWriter;

import java.util.HashMap;

public class EncodingSampleActivity extends AppCompatActivity {

    private LinearLayout encodingSampleLinearLayout;

    private EditText textToEncodeEditText;

    private ImageView encodedImageView;

    private final String tag = "EncodingSampleActivity";

    @Override

    protected void onCreate(@Nullable Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_encoding_sample);

        encodingSampleLinearLayout = findViewById(R.id.encodingSampleLinearLayout);

        textToEncodeEditText = findViewById(R.id.textToEncodeEditText);

        encodedImageView = findViewById(R.id.encodedImageView);

        findViewById(R.id.encodeButton).setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                String contents = textToEncodeEditText.getText().toString();

                if (contents.isEmpty())

                    contents = "在此输入要编码的文本";

                try {

                    int width = encodingSampleLinearLayout.getWidth() - 50, height = width;

                    HashMap<EncodeHintType, String> hints = new HashMap<>();

                    hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");

                    BitMatrix bitMatrix = new QRCodeWriter().encode(contents, BarcodeFormat.QR_CODE, width, height, hints);

                    int[] colors = new int[width * height];

                    for (int y = 0; y < height; ++y) {

                        for (int x = 0; x < width; ++x)

                            colors[width * y + x] = bitMatrix.get(x, y) ? Color.RED : Color.WHITE;

                    }

                    Bitmap qrcodeBitmap = Bitmap.createBitmap(colors, width, height, Bitmap.Config.RGB_565);

                    encodedImageView.setImageBitmap(qrcodeBitmap);

                } catch (WriterException ex) {

                    Log.e(tag, "ex: " + ex);

                }

            }

        });

    }

}

解码示例

package com.wolf_pan.qrcodesample;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.Bundle;

import android.support.annotation.Nullable;

import android.support.v7.app.AppCompatActivity;

import android.util.Log;

import android.view.View;

import android.widget.ImageView;

import android.widget.TextView;

import com.google.zxing.BinaryBitmap;

import com.google.zxing.RGBLuminanceSource;

import com.google.zxing.common.HybridBinarizer;

import com.google.zxing.qrcode.QRCodeReader;

import java.io.IOException;

public class DecodingSampleActivity extends AppCompatActivity {

    private ImageView qrcodeToDecodeImageView;

    private TextView decodedTextView;

    private Bitmap bitmap;

    private final String tag = "DecodingSampleActivity";

    @Override

    protected void onCreate(@Nullable Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_decoding_sample);

        qrcodeToDecodeImageView = findViewById(R.id.qrcodeToDecodeImageView);

        decodedTextView = findViewById(R.id.decodedTextView);

        findViewById(R.id.decodeButton).setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                try {

                    int width = bitmap.getWidth(), height = bitmap.getHeight();

                    int[] pixels = new int[width * height];

                    bitmap.getPixels(pixels, 0, width, 0, 0, width, height);

                    String decoded = new QRCodeReader().decode(new BinaryBitmap(new HybridBinarizer(new RGBLuminanceSource(width, height, pixels)))).getText();

                    decodedTextView.setText(decoded);

                } catch (Exception ex) {

                    Log.e(tag, "ex: " + ex);

                }

            }

        });

        try {

            bitmap = BitmapFactory.decodeStream(getAssets().open("qrcode_qq.png"));

            qrcodeToDecodeImageView.setImageBitmap(bitmap);

        } catch (IOException ex) {

            Log.e(tag, "ex: " + ex);

        }

    }

}