這期內(nèi)容當(dāng)中小編將會(huì)給大家?guī)碛嘘P(guān)Android 中怎么實(shí)現(xiàn)點(diǎn)擊生成二維碼功能,文章內(nèi)容豐富且以專業(yè)的角度為大家分析和敘述,閱讀完這篇文章希望大家可以有所收獲。
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QRCodeUtil:
package com.example.administrator.zxing; import android.graphics.Bitmap; import android.graphics.Canvas; 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 com.google.zxing.qrcode.decoder.ErrorCorrectionLevel; import java.io.FileOutputStream; import java.io.IOException; import java.util.HashMap; import java.util.Map; public class QRCodeUtil { public static boolean createQRImage(String content, int widthPix, int heightPix, Bitmap logoBm, String filePath) { try { if (content == null || "".equals(content)) { return false; } //配置參數(shù) Maphints = new HashMap<>(); hints.put(EncodeHintType.CHARACTER_SET, "utf-8"); //容錯(cuò)級(jí)別 hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H); //設(shè)置空白邊距的寬度 // hints.put(EncodeHintType.MARGIN, 2); //default is 4 // 圖像數(shù)據(jù)轉(zhuǎn)換,使用了矩陣轉(zhuǎn)換 BitMatrix bitMatrix = new QRCodeWriter().encode(content, BarcodeFormat.QR_CODE, widthPix, heightPix, hints); int[] pixels = new int[widthPix * heightPix]; // 下面這里按照二維碼的算法,逐個(gè)生成二維碼的圖片, // 兩個(gè)for循環(huán)是圖片橫列掃描的結(jié)果 for (int y = 0; y < heightPix; y++) { for (int x = 0; x < widthPix; x++) { if (bitMatrix.get(x, y)) { pixels[y * widthPix + x] = 0xff000000; } else { pixels[y * widthPix + x] = 0xffffffff; } } } // 生成二維碼圖片的格式,使用ARGB_8888 Bitmap bitmap = Bitmap.createBitmap(widthPix, heightPix, Bitmap.Config.ARGB_8888); bitmap.setPixels(pixels, 0, widthPix, 0, 0, widthPix, heightPix); if (logoBm != null) { bitmap = addLogo(bitmap, logoBm); } //必須使用compress方法將bitmap保存到文件中再進(jìn)行讀取。直接返回的bitmap是沒有任何壓縮的,內(nèi)存消耗巨大! return bitmap != null && bitmap.compress(Bitmap.CompressFormat.JPEG, 100, new FileOutputStream(filePath)); } catch (WriterException | IOException e) { e.printStackTrace(); } return false; } /** * 在二維碼中間添加Logo圖案 */ private static Bitmap addLogo(Bitmap src, Bitmap logo) { if (src == null) { return null; } if (logo == null) { return src; } //獲取圖片的寬高 int srcWidth = src.getWidth(); int srcHeight = src.getHeight(); int logoWidth = logo.getWidth(); int logoHeight = logo.getHeight(); if (srcWidth == 0 || srcHeight == 0) { return null; } if (logoWidth == 0 || logoHeight == 0) { return src; } //logo大小為二維碼整體大小的1/5 float scaleFactor = srcWidth * 1.0f / 5 / logoWidth; Bitmap bitmap = Bitmap.createBitmap(srcWidth, srcHeight, Bitmap.Config.ARGB_8888); try { Canvas canvas = new Canvas(bitmap); canvas.drawBitmap(src, 0, 0, null); canvas.scale(scaleFactor, scaleFactor, srcWidth / 2, srcHeight / 2); canvas.drawBitmap(logo, (srcWidth - logoWidth) / 2, (srcHeight - logoHeight) / 2, null); canvas.save(Canvas.ALL_SAVE_FLAG); canvas.restore(); } catch (Exception e) { bitmap = null; e.getStackTrace(); } return bitmap; } }
MainActivity:
package com.example.administrator.zxing; import android.content.Context; import android.graphics.BitmapFactory; import android.os.Bundle; import android.os.Environment; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; import android.widget.CheckBox; import android.widget.EditText; import android.widget.ImageView; import java.io.File; public class MainActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //內(nèi)容 final EditText contentET = (EditText) findViewById(R.id.create_qr_content); //顯示二維碼圖片 final ImageView imageView = (ImageView) findViewById(R.id.create_qr_iv); //是否添加Logo final CheckBox addLogoCB = (CheckBox) findViewById(R.id.create_qr_addLogo); Button createQrBtn = (Button) findViewById(R.id.create_qr_btn); createQrBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { final String filePath = getFileRoot(MainActivity.this) + File.separator + "qr_" + System.currentTimeMillis() + ".jpg"; //二維碼圖片較大時(shí),生成圖片、保存文件的時(shí)間可能較長,因此放在新線程中 new Thread(new Runnable() { @Override public void run() { boolean success = QRCodeUtil.createQRImage(contentET.getText().toString().trim(), 800, 800, addLogoCB.isChecked() ? BitmapFactory.decodeResource(getResources(), R.mipmap.qr_logo) : null, filePath); if (success) { runOnUiThread(new Runnable() { @Override public void run() { imageView.setImageBitmap(BitmapFactory.decodeFile(filePath)); } }); } } }).start(); } }); } //文件存儲(chǔ)根目錄 private String getFileRoot(Context context) { if (Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED)) { File external = context.getExternalFilesDir(null); if (external != null) { return external.getAbsolutePath(); } } return context.getFilesDir().getAbsolutePath(); } }
布局:
activity_main:
上述就是小編為大家分享的Android 中怎么實(shí)現(xiàn)點(diǎn)擊生成二維碼功能了,如果剛好有類似的疑惑,不妨參照上述分析進(jìn)行理解。如果想知道更多相關(guān)知識(shí),歡迎關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道。