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;
/**
* Created by sf.
*/
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();
}
});
}
/**
* signPath是图片保存路径
*
* @param bit
*/
public void saveSign(Bitmap bit) {
time = System.currentTimeMillis();
fileName = getDateTimeFromMillisecond(time);
mSignBitmap = bit;
signPath = createFile();
}
/**
* @return
*/
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();
}
}
/**
* 将毫秒转化成固定格式的时间
* 时间格式: yyyy-MM-dd HH:mm:ss
*
* @param millisecond
* @return
*/
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。
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