android手写签名库android-signaturepad

浅浅的花香味﹌ 2022-12-11 13:52 526阅读 0赞

android推荐个手写签名库[android-signaturepad][]，2.3k

##### 签名回调 #####

public interface SignListener { 
        public void onSignImage(String path);
    }

##### 签名弹框封装类 #####

包含保存为本地文件的功能

import android.app.Activity;
    import android.app.Dialog;
    import android.content.Context;
    import android.graphics.Bitmap;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.os.Environment;
    import android.text.TextUtils;
    import android.util.Log;
    import android.view.Gravity;
    import android.view.View;
    import android.view.Window;
    import android.view.WindowManager;
    
    import com.example.noemhost.SignListener;
    import com.github.gcacace.signaturepad.views.SignaturePad;
    
    import java.io.File;
    import java.io.FileOutputStream;
    import java.io.IOException;
    import java.io.OutputStream;
    
    public class SignatureDialog { 
    
        public static class Builder { 
    
            private SignListener mListener;
            private Context mContext;
            public Builder(Context context, SignListener listener) { 
                mContext = context;
                mListener = listener;
            }
    
            public Dialog create() { 
                final Dialog dialog = new Dialog(mContext, R.style.dialog_style);
                dialog.setContentView(R.layout.activity_signature);
                dialog.setCancelable(true);
                dialog.setCanceledOnTouchOutside(true);
                final SignaturePad mSignaturePad = (SignaturePad) dialog.findViewById(R.id.signature_pad);
                dialog.findViewById(R.id.dialog_confirm_cancel_tv).setOnClickListener(new View.OnClickListener() { 
                    @Override
                    public void onClick(View v) { 
                        dialog.dismiss();
                    }
                });
                dialog.findViewById(R.id.dialog_confirm_clear_tv).setOnClickListener(new View.OnClickListener() { 
                    @Override
                    public void onClick(View v) { 
                        mSignaturePad.clear();
                    }
                });
                dialog.findViewById(R.id.dialog_confirm_confirm_tv).setOnClickListener(new View.OnClickListener() { 
                    @Override
                    public void onClick(View v) { 
                        if(!mSignaturePad.isEmpty()){ 
                            Bitmap signatureBitmap = mSignaturePad.getSignatureBitmap();
                            String imagePath = addJpgSignatureToGallery(signatureBitmap);
                            if(!TextUtils.isEmpty(imagePath)){ 
                                mListener.onSignImage(imagePath);
                                dialog.dismiss();
                            } else { 
                                ToastUtils.toastShortMsg((Activity) mContext, "签名保存失败");
                            }
                        } else { 
                            ToastUtils.toastShortMsg((Activity) mContext, "请先签名");
                        }
                    }
                });
    
                mSignaturePad.setOnSignedListener(new SignaturePad.OnSignedListener() { 
    
                    @Override
                    public void onStartSigning() { 
                        //Event triggered when the pad is touched
                    }
    
                    @Override
                    public void onSigned() { 
                        //Event triggered when the pad is signed
                    }
    
                    @Override
                    public void onClear() { 
                        //Event triggered when the pad is cleared
                    }
                });
    
                Window window = dialog.getWindow();
                window.setGravity(Gravity.CENTER);
                window.getDecorView().setPadding(0, 0, 0, 0);
    
                WindowManager.LayoutParams lp = window.getAttributes();
                lp.width = WindowManager.LayoutParams.MATCH_PARENT;
                lp.height = WindowManager.LayoutParams.MATCH_PARENT;
                window.setAttributes(lp);
                return dialog;
            }
    
            public Dialog show() { 
                Dialog dialog = create();
                dialog.show();
                return dialog;
            }
    
            public File getAlbumStorageDir(String albumName) { 
                File file = new File(Environment.getExternalStoragePublicDirectory(
                        Environment.DIRECTORY_PICTURES), albumName);
                if (!file.mkdirs()) { 
                    Log.e("SignaturePad", "Directory not created");
                }
                return file;
            }
    
    
    
            public String addJpgSignatureToGallery(Bitmap signature) { 
                String imgPath = "";
                try { 
                    File photo = new File(getAlbumStorageDir("SignaturePad"), String.format("Signature_%d.jpg", System.currentTimeMillis()));
                    saveBitmapToJPG(signature, photo);
                    imgPath = photo.getPath();
                } catch (IOException e) { 
                    e.printStackTrace();
                }
                return imgPath;
            }
    
            public void saveBitmapToJPG(Bitmap bitmap, File photo) throws IOException { 
                Bitmap newBitmap = Bitmap.createBitmap(bitmap.getWidth(), bitmap.getHeight(), Bitmap.Config.ARGB_8888);
                Canvas canvas = new Canvas(newBitmap);
                canvas.drawColor(Color.WHITE);
                canvas.drawBitmap(bitmap, 0, 0, null);
                OutputStream stream = new FileOutputStream(photo);
                newBitmap.compress(Bitmap.CompressFormat.JPEG, 80, stream);
                stream.close();
            }
        }
    }

##### 签名使用 #####

new SignatureDialog.Builder(activity, new SignListener() { 
    	@Override
        public void onSignImage(String path) { 
        	path===为存储到本地的路径                
    	}
    }).show();

参考：[https://blog.csdn.net/jifenglie/article/details/100033539][https_blog.csdn.net_jifenglie_article_details_100033539]

[android-signaturepad]: https://github.com/gcacace/android-signaturepad
[https_blog.csdn.net_jifenglie_article_details_100033539]: https://blog.csdn.net/jifenglie/article/details/100033539