Android webview長按識別二維碼及儲存圖片到本地

摘要： 新增所需要的依賴框架： implementation 'cn.yipianfengye.android:zxing-library:2.2' implementation 'com.github.bumptech.glide:glide:4.1.1'...

新增所需要的依賴框架：

implementation 'cn.yipianfengye.android:zxing-library:2.2'
implementation 'com.github.bumptech.glide:glide:4.1.1'

長按識別圖片是否為二維碼：

/**
* 長按webview圖片
*/
webView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
final WebView.HitTestResult htr = ((WebView) v).getHitTestResult();//獲取所點選的內容
if (htr.getType() == WebView.HitTestResult.IMAGE_TYPE //判斷被點選的型別為圖片
|| htr.getType() == WebView.HitTestResult.IMAGE_ANCHOR_TYPE
|| htr.getType() == WebView.HitTestResult.SRC_IMAGE_ANCHOR_TYPE) {
imagePath = htr.getExtra();
analyzeBitmap(htr.getExtra(), new AnalyzeCallback() {
@Override
public void onAnalyzeSuccess(Bitmap mBitmap, final String result) {
List<String> list = new ArrayList<>();
list.add("儲存圖片到本地");
list.add("識別圖中二維碼");
showDialog(list, result);
}

@Override
public void onAnalyzeFailed() {
List<String> list = new ArrayList<>();
list.add("儲存圖片到本地");
showDialog(list, "");
}
});
}
return false;
}
});

/**
* 解析二維碼圖片工具類
*/
public void analyzeBitmap(final String path, final AnalyzeCallback analyzeCallback) {
Glide.with(getActivity()).load(path).into(new SimpleTarget<Drawable>() {
@Override
public void onResourceReady(Drawable resource, Transition<? super Drawable> transition) {
BitmapDrawable bd = (BitmapDrawable) resource;
mBitmap = bd.getBitmap();
MultiFormatReader multiFormatReader = new MultiFormatReader();

// 解碼的引數
Hashtable<DecodeHintType, Object> hints = new Hashtable<DecodeHintType, Object>(2);
// 可以解析的編碼型別
Vector<BarcodeFormat> decodeFormats = new Vector<BarcodeFormat>();
if (decodeFormats == null || decodeFormats.isEmpty()) {
decodeFormats = new Vector<BarcodeFormat>();

// 這裡設定可掃描的型別，我這裡選擇了都支援
decodeFormats.addAll(DecodeFormatManager.ONE_D_FORMATS);
decodeFormats.addAll(DecodeFormatManager.QR_CODE_FORMATS);
decodeFormats.addAll(DecodeFormatManager.DATA_MATRIX_FORMATS);
}
hints.put(DecodeHintType.POSSIBLE_FORMATS, decodeFormats);
// 設定繼續的字元編碼格式為UTF8
// hints.put(DecodeHintType.CHARACTER_SET, "UTF8");
// 設定解析配置引數
multiFormatReader.setHints(hints);

// 開始對影象資源解碼
Result rawResult = null;
try {
rawResult = multiFormatReader.decodeWithState(new BinaryBitmap(new HybridBinarizer(new BitmapLuminanceSource(mBitmap))));
} catch (Exception e) {
e.printStackTrace();
}

if (rawResult != null) {
if (analyzeCallback != null) {
analyzeCallback.onAnalyzeSuccess(mBitmap, rawResult.getText());
}
} else {
if (analyzeCallback != null) {
analyzeCallback.onAnalyzeFailed();
}
}
}
});
}

/**
* 解析二維碼結果
*/
public interface AnalyzeCallback {

void onAnalyzeSuccess(Bitmap mBitmap, String result);

void onAnalyzeFailed();
}

附：儲存圖片到本地的方法：

private class SaveImage extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
String result = "";
try {
String sdcard = null;
String sdStatus = Environment.getExternalStorageState();
if (sdStatus.equals(Environment.MEDIA_MOUNTED)) { // 檢測sd卡是否可用
sdcard = Environment.getExternalStorageDirectory().getAbsolutePath();
} else {
ToastUtil.show(getActivity(), "SD卡不可用");
}
File file = new File(sdcard + "/Download");
if (!file.exists()) {
file.mkdirs();
}
file = new File(sdcard + "/Download/" + new Date().getTime() + ".jpg");
InputStream inputStream = null;
URL url = new URL(imagePath);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(20000);
if (conn.getResponseCode() == 200) {
inputStream = conn.getInputStream();
}
byte[] buffer = new byte[4096];
int len = 0;
FileOutputStream outStream = new FileOutputStream(file);
while ((len = inputStream.read(buffer)) != -1) {
outStream.write(buffer, 0, len);
}
outStream.close();
result = "圖片已儲存至：" + file.getAbsolutePath();
} catch (Exception e) {
result = "儲存失敗！" + e.getLocalizedMessage();
}
return result;
}

@Override
protected void onPostExecute(String result) {
ToastUtil.show(getActivity(), result);
}
}

使用方法：

SaveImage saveImage = new SaveImage();
saveImage.execute();

注：Android 6.0以上需動態申請許可權：WRITE_EXTERNAL_STORAGE，READ_EXTERNAL_STORAGE，才能儲存圖片到本地。