这篇文章将为大家详细讲解有关Android如何实现仿银行客户签名功能，小编觉得挺实用的，因此分享给大家做个参考，希望大家阅读完这篇文章后可以有所收获。
首先需要一个自定义view用来签字使用,可以修改颜色和画笔的粗细，可以擦拭重新画
package com.android.tcm.view;import android.content.Context;import android.graphics.Bitmap;import android.graphics.Bitmap.Config;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.graphics.PorterDuff.Mode;import android.graphics.PorterDuffXfermode;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;public class SignView extends View { private Paint paint; private Canvas cacheCanvas; private Bitmap cachebBitmap; private Path path; static final int BACKGROUND_COLOR = Color.WHITE; static final int BRUSH_COLOR = Color.BLACK; public SignView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); // initView(context); // TODO Auto-generated constructor stub } public SignView(Context context, AttributeSet attrs) { super(context, attrs); // initView(context); // TODO Auto-generated constructor stub } public SignView(Context context) { super(context); // initView(context); // TODO Auto-generated constructor stub } public void initView(Context context) { } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { // TODO Auto-generated method stub super.onMeasure(widthMeasureSpec, heightMeasureSpec); paint = new Paint(); paint.setAntiAlias(true); paint.setStrokeWidth(3); paint.setStyle(Paint.Style.STROKE); paint.setColor(Color.RED); path = new Path(); cachebBitmap = Bitmap.createBitmap( MeasureSpec.getSize(widthMeasureSpec), MeasureSpec.getSize(heightMeasureSpec), Config.ARGB_8888); cacheCanvas = new Canvas(cachebBitmap); cacheCanvas.drawColor(Color.TRANSPARENT); } public Bitmap getCachebBitmap() { return cachebBitmap; } public void clear() { if (cacheCanvas != null) { paint.setXfermode(new PorterDuffXfermode(Mode.CLEAR)); cacheCanvas.drawPaint(paint); paint = new Paint(); paint.setAntiAlias(true); paint.setStrokeWidth(3); paint.setStyle(Paint.Style.STROKE); paint.setColor(Color.RED); invalidate(); } } @Override protected void onDraw(Canvas canvas) { // canvas.drawColor(BRUSH_COLOR); 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, 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: { if(isListener!=null){ isListener.sign(); } 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; } public interface isSignListener{ void sign(); } isSignListener isListener; public void setIsListener(isSignListener isListener) { this.isListener = isListener; }}布局代码如下
<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <RelativeLayout android:id="@+id/rl" android:layout_width="match_parent" android:layout_height="match_parent" android:background="@color/white"> <FrameLayout android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginBottom="40dp"> <com.android.tcm.view.SignView android:id="@+id/signView" android:layout_width="match_parent" android:layout_height="match_parent" /> </FrameLayout> <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_centerHorizontal="true" android:orientation="horizontal"> <TextView android:id="@+id/tv_clear" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" android:paddingBottom="15dp" android:paddingTop="15dp" android:text="擦除重签" android:textSize="18sp" /> <TextView android:id="@+id/tv_commit" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="20dp" android:gravity="center" android:paddingBottom="15dp" android:paddingTop="15dp" android:text="确认" android:textSize="18sp" /> </LinearLayout> </RelativeLayout></RelativeLayout>主函数代码，用于获取截图（id：rl）的，并且把文件保存到本地（文件夹TVC下文件命名为当前时间如20170713 10:31:31.jpg）
package com.android.tcm.activity;import android.graphics.Bitmap;import android.os.Bundle;import android.os.Environment;import android.view.View;import android.widget.RelativeLayout;import android.widget.TextView;import com.android.tcm.R;import com.android.tcm.view.SignView;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Date;public class SignActivity extends Activity { private RelativeLayout rl; private SignView mView; private TextView commit, clear; private Bitmap mSignBitmap; private String signPath; private long time; private String fileName; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_sign); initView(); } public void initView() { mView = (SignView) findViewById(R.id.signView); commit = (TextView) findViewById(R.id.tv_commit); clear = (TextView) findViewById(R.id.tv_clear); rl= (RelativeLayout) findViewById(R.id.rl); commit.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) {// commit.getDrawingCache();//获取控件的截图// saveSign(BitmapUtil.myShot(SignActivity.this)); rl.setDrawingCacheEnabled(true); saveSign(rl.getDrawingCache()); rl.setDrawingCacheEnabled(false); } }); clear.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { mView.clear(); } }); } public void saveSign(Bitmap bit) { time = System.currentTimeMillis(); fileName = getDateTimeFromMillisecond(time); mSignBitmap = bit; signPath = createFile(); } private String createFile() { ByteArrayOutputStream baos = null; String _path = null; try { String sign_dir = Environment.getExternalStorageDirectory() .getPath() + "/" + "TCM" + "/"; File dir = new File(sign_dir); if (!dir.exists()) { dir.mkdirs(); } _path = sign_dir + fileName + ".jpg"; baos = new ByteArrayOutputStream(); mSignBitmap.compress(Bitmap.CompressFormat.JPEG, 100, baos); byte[] photoBytes = baos.toByteArray(); if (photoBytes != null) { new FileOutputStream(new File(_path)).write(photoBytes); } } catch (IOException e) { e.printStackTrace(); } finally { try { if (baos != null) baos.close(); } catch (IOException e) { e.printStackTrace(); } } return _path; } @Override protected void onDestroy() { // TODO Auto-generated method stub super.onDestroy(); if (mSignBitmap != null) { mSignBitmap.recycle(); } } public static String getDateTimeFromMillisecond(Long millisecond) { SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); Date date = new Date(millisecond); String dateStr = simpleDateFormat.format(date); return dateStr; }}关于“Android如何实现仿银行客户签名功能”这篇文章就分享到这里了，希望以上内容可以对大家有一定的帮助，使各位可以学到更多知识，如果觉得文章不错，请把它分享出去让更多的人看到。
