Java 向文档添加签名的Android应用程序

我必须编写一个android应用程序，允许用户在文档中添加签名

我不知道怎么做。

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是否有允许这样做的api java或我可以在我的应用程序中使用的东西？

您可以做的是在文档下面添加一个签名板，如下所示：-

步骤1将此添加到build.gradel compile'com.github.gcacace:signature pad:1.2.0中

2将此添加到文档下方的布局文件中

<com.github.gcacace.signaturepad.views.SignaturePad
            android:id="@+id/signature_pad"
            android:layout_width="fill_parent"
            android:layout_height="160dp"
            android:layout_marginBottom="52dp"
            android:background="@drawable/border"
            app:penMinWidth="5dp" />

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如果您需要更多帮助，可以在此处发表评论。

请编辑您的问题，并用详细的编程术语解释向文档添加签名的含义。您可能需要手势生成器。我觉得这个环节。会对你有用的。如果您需要再次检查签名。

private void createBitmapSvg()
{
    Bitmap signatureBitmap = mSignaturePad.getSignatureBitmap();
    if (addJpgSignatureToGallery(signatureBitmap))
    {
        //Toast.makeText(AgreementSignature.this, "Signature saved into the Gallery", Toast.LENGTH_SHORT).show();
    }
    else
    {
        Toast.makeText(AgreementSignature.this, "Unable to store the signature", Toast.LENGTH_SHORT).show();
    }
    if (addSvgSignatureToGallery(mSignaturePad.getSignatureSvg()))
    {
        //Toast.makeText(AgreementSignature.this, "SVG Signature saved into the Gallery", Toast.LENGTH_SHORT).show();
    }
    else
    {
        Toast.makeText(AgreementSignature.this, "Unable to store the SVG signature", Toast.LENGTH_SHORT).show();
    }
}

public boolean addJpgSignatureToGallery(Bitmap signature) {
    boolean result = false;
    try {

        String path = Environment.getExternalStorageDirectory()
                + "/Android/data/"
                + getApplicationContext().getPackageName()
                + "/Files";

        File dir = new File(path);
        if (!dir.exists())
            dir.mkdirs();

        File photo = new File(Environment.getExternalStorageDirectory() + "/Android/data/" + context.getPackageName() + "/" + String.format("Signature_%d.jpg", System.currentTimeMillis()));
        saveBitmapToJPG(signature, photo);
        scanMediaFile(photo);
        result = true;
    } catch (IOException e) {
        e.printStackTrace();
    }
    return result;
}

private void scanMediaFile(File photo) {
    Intent mediaScanIntent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
    Uri contentUri = Uri.fromFile(photo);
    mediaScanIntent.setData(contentUri);
    AgreementSignature.this.sendBroadcast(mediaScanIntent);
}

public boolean addSvgSignatureToGallery(String signatureSvg) {
    boolean result = false;
    try {
        File svgFile = new File(getAlbumStorageDir("SignaturePad"), String.format("Signature_%d.svg", System.currentTimeMillis()));
        OutputStream stream = new FileOutputStream(svgFile);
        OutputStreamWriter writer = new OutputStreamWriter(stream);
        writer.write(signatureSvg);
        writer.close();
        stream.flush();
        stream.close();
        scanMediaFile(svgFile);
        result = true;
    } catch (IOException e) {
        e.printStackTrace();
    }
    return result;
}