android画布实现签名,android实现手写签名功能

本文实例为大家分享了android手写签名展示的具体代码&＃xff0c;供大家参考&＃xff0c;具体内容如下

代码简单&＃xff0c;就不发demo了&＃xff0c;直接贴代码

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: 签名类

* 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;

&＃64;Override public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_signature);

imageSign &＃61; findViewById(R.id.iv_sign);

FrameLayout frameLayout &＃61; findViewById(R.id.fl_view);

mView &＃61; new SignatureView(this);

frameLayout.addView(mView);

mView.requestFocus();

Button btnClear &＃61; findViewById(R.id.btn_clear);

btnClear.setOnClickListener((v) -> {

mView.clear();

});

Button btnOk &＃61; findViewById(R.id.btn_ok);

btnOk.setOnClickListener((v) -> {

Bitmap imageBitmap &＃61; mView.getCachebBitmap();

imageSign.setImageBitmap(imageBitmap);

});

}

/**

* 自定义签名控件

*/

class SignatureView extends View {

//画笔

private Paint paint;

//画布

private Canvas cacheCanvas;

//位图

private Bitmap cachebBitmap;

//图片保存路径

private Path path;

//位图缓存

public Bitmap getCachebBitmap() {

return cachebBitmap;

}

public SignatureView(Context context) {

super(context);

init();

}

/**

* 初始化

*/

private void init() {

//设置画笔

paint &＃61; new Paint();

paint.setAntiAlias(true);

paint.setStrokeWidth(3);

paint.setStyle(Paint.Style.STROKE);

paint.setColor(Color.BLACK);

path &＃61; new Path();

//创建位图

cachebBitmap &＃61; Bitmap.createBitmap(10, 10, Bitmap.Config.ARGB_8888);

//用自定义位图构建画布

cacheCanvas &＃61; new Canvas(cachebBitmap);

//设置画布为白色

cacheCanvas.drawColor(Color.WHITE);

}

/**

* 清除画板&＃xff0c;重置画笔

*/

public void clear() {

if (cacheCanvas !&＃61; null) {

paint.setColor(Color.WHITE);

cacheCanvas.drawPaint(paint);

paint.setColor(Color.BLACK);

cacheCanvas.drawColor(Color.WHITE);

invalidate();

}

}

&＃64;Override protected void onDraw(Canvas canvas) {

canvas.drawBitmap(cachebBitmap, 0, 0, null);

canvas.drawPath(path, paint);

}

&＃64;Override protected void onSizeChanged(int w, int h, int oldw, int oldh) {

int curW &＃61; cachebBitmap !&＃61; null ? cachebBitmap.getWidth() : 0;

int curH &＃61; cachebBitmap !&＃61; null ? cachebBitmap.getHeight() : 0;

if (curW >&＃61; w && curH >&＃61; h) {

return;

}

if (curW

if (curH

Bitmap newBitmap &＃61; Bitmap.createBitmap(curW, curH, Bitmap.Config.ARGB_8888);

Canvas newCanvas &＃61; new Canvas();

newCanvas.setBitmap(newBitmap);

if (cachebBitmap !&＃61; null) {

newCanvas.drawBitmap(cachebBitmap, 0, 0, null);

}

cachebBitmap &＃61; newBitmap;

cacheCanvas &＃61; newCanvas;

}

private float cur_x, cur_y;

&＃64;Override public boolean onTouchEvent(MotionEvent event) {

float x &＃61; event.getX();

float y &＃61; event.getY();

switch (event.getAction()) {

case MotionEvent.ACTION_DOWN: {

cur_x &＃61; x;

cur_y &＃61; y;

path.moveTo(cur_x, cur_y);

break;

}

case MotionEvent.ACTION_MOVE: {

path.quadTo(cur_x, cur_y, x, y);

cur_x &＃61; x;

cur_y &＃61; y;

break;

}

case MotionEvent.ACTION_UP: {

cacheCanvas.drawPath(path, paint);

path.reset();

break;

}

}

invalidate();

return true;

}

}

}

布局文件&＃xff1a;

android:layout_width&＃61;"match_parent"

android:layout_height&＃61;"match_parent"

android:orientation&＃61;"vertical"

>

android:id&＃61;"&＃64;&＃43;id/iv_sign"

android:layout_width&＃61;"match_parent"

android:layout_height&＃61;"0dp"

android:layout_gravity&＃61;"center"

android:layout_marginBottom&＃61;"3dp"

android:layout_weight&＃61;"1"

android:background&＃61;"&＃64;color/white"

/>

android:id&＃61;"&＃64;&＃43;id/fl_view"

android:layout_width&＃61;"match_parent"

android:layout_height&＃61;"0dp"

android:layout_weight&＃61;"1"

android:background&＃61;"&＃64;color/white"

/>

android:layout_width&＃61;"match_parent"

android:layout_height&＃61;"wrap_content"

android:background&＃61;"&＃64;android:drawable/bottom_bar"

android:paddingTop&＃61;"3dp"

>

android:id&＃61;"&＃64;&＃43;id/btn_ok"

android:layout_width&＃61;"0dp"

android:layout_height&＃61;"wrap_content"

android:layout_weight&＃61;"1"

android:text&＃61;"确定"

/>

android:id&＃61;"&＃64;&＃43;id/btn_clear"

android:layout_width&＃61;"0dp"

android:layout_height&＃61;"wrap_content"

android:layout_weight&＃61;"1"

android:text&＃61;"清除"

/>

以上就是本文的全部内容&＃xff0c;希望对大家的学习有所帮助&＃xff0c;也希望大家多多支持。