本篇文章給大家分享的是有關(guān)android中怎么實(shí)現(xiàn)一個手寫簽名功能，小編覺得挺實(shí)用的，因此分享給大家學(xué)習(xí)，希望大家閱讀完這篇文章后可以有所收獲，話不多說，跟著小編一起來看看吧。
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具體內(nèi)容如下
package com.xx; import android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.view.MotionEvent;import android.view.View;import android.widget.Button;import android.widget.FrameLayout;import android.widget.ImageView;import com.xx.R; /** * Description: 簽名類 * Copyright: Copyright (c)2018 * Company: * author: Corwin * version: 1.0 * date: 2018/9/5 18:32 * Modification History: * Date Author Version Description * ------------------------------------------------------------------ * 2018/9/5 Corwin 1.0 1.0 Version */public class SignatureActivity extends AppCompatActivity { private ImageView imageSign; private SignatureView mView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_signature); imageSign = findViewById(R.id.iv_sign); FrameLayout frameLayout = findViewById(R.id.fl_view); mView = new SignatureView(this); frameLayout.addView(mView); mView.requestFocus(); Button btnClear = findViewById(R.id.btn_clear); btnClear.setOnClickListener((v) -> { mView.clear(); }); Button btnOk = findViewById(R.id.btn_ok); btnOk.setOnClickListener((v) -> { Bitmap imageBitmap = mView.getCachebBitmap(); imageSign.setImageBitmap(imageBitmap); }); } /** * 自定義簽名控件 */ class SignatureView extends View { //畫筆 private Paint paint; //畫布 private Canvas cacheCanvas; //位圖 private Bitmap cachebBitmap; //圖片保存路徑 private Path path; //位圖緩存 public Bitmap getCachebBitmap() { return cachebBitmap; } public SignatureView(Context context) { super(context); init(); } /** * 初始化 */ private void init() { //設(shè)置畫筆 paint = new Paint(); paint.setAntiAlias(true); paint.setStrokeWidth(3); paint.setStyle(Paint.Style.STROKE); paint.setColor(Color.BLACK); path = new Path(); //創(chuàng)建位圖 cachebBitmap = Bitmap.createBitmap(10, 10, Bitmap.Config.ARGB_8888); //用自定義位圖構(gòu)建畫布 cacheCanvas = new Canvas(cachebBitmap); //設(shè)置畫布為白色 cacheCanvas.drawColor(Color.WHITE); } /** * 清除畫板，重置畫筆 */ public void clear() { if (cacheCanvas != null) { paint.setColor(Color.WHITE); cacheCanvas.drawPaint(paint); paint.setColor(Color.BLACK); cacheCanvas.drawColor(Color.WHITE); invalidate(); } } @Override protected void onDraw(Canvas canvas) { canvas.drawBitmap(cachebBitmap, 0, 0, null); canvas.drawPath(path, paint); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { int curW = cachebBitmap != null ? cachebBitmap.getWidth() : 0; int curH = cachebBitmap != null ? cachebBitmap.getHeight() : 0; if (curW >= w && curH >= h) { return; } if (curW < w) curW = w; if (curH < h) curH = h; Bitmap newBitmap = Bitmap.createBitmap(curW, curH, Bitmap.Config.ARGB_8888); Canvas newCanvas = new Canvas(); newCanvas.setBitmap(newBitmap); if (cachebBitmap != null) { newCanvas.drawBitmap(cachebBitmap, 0, 0, null); } cachebBitmap = newBitmap; cacheCanvas = newCanvas; } private float cur_x, cur_y; @Override public boolean onTouchEvent(MotionEvent event) { float x = event.getX(); float y = event.getY(); switch (event.getAction()) { case MotionEvent.ACTION_DOWN: { cur_x = x; cur_y = y; path.moveTo(cur_x, cur_y); break; } case MotionEvent.ACTION_MOVE: { path.quadTo(cur_x, cur_y, x, y); cur_x = x; cur_y = y; break; } case MotionEvent.ACTION_UP: { cacheCanvas.drawPath(path, paint); path.reset(); break; } } invalidate(); return true; } }}
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以上就是android中怎么實(shí)現(xiàn)一個手寫簽名功能，小編相信有部分知識點(diǎn)可能是我們?nèi)粘９ぷ鲿姷交蛴玫降摹ＯＭ隳芡ㄟ^這篇文章學(xué)到更多知識。更多詳情敬請關(guān)注創(chuàng)新互聯(lián)行業(yè)資訊頻道。
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