如何在android中验证签名板是否空？

Question

如何在android中验证签名板是否为空？

如何检查签名是否完全空白，即所有像素都是透明的？

我必须避免每个像素都有一个x-y循环。

Answer 1

//globally
private boolean isSignatured = false;

//onCreate
mSignaturePad.setOnSignedListener(new SignaturePad.OnSignedListener() {
@Override
public void onSigned() {
   //Event triggered when the pad is signed
    isSignatured = true;
}

@Override
public void onClear() {
   //Event triggered when the pad is cleared
}
});

//in your on click
if(isSignatured){
    //do next process
}else{
    //intimate to sign
}

Answer 2

试试这个代码，它正在工作

if(!signature_view.isBitmapEmpty()) {
   saveNotes(signature_view);
  }