Android 实现银联刷卡机消费后手动签名的功能(示例代码)

package com.view;import android/146948.html">android.content.Context;import android.graphics.Bitmap;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.PorterDuff;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.widget.LinearLayout;/** * Created by jiang on 2017/12/25. */public class MDrawLineView extends View { public MDrawLineView(Context context){  super(context); } public MDrawLineView(Context context,AttributeSet attrs){  super(context, attrs);  paint=new Paint(Paint.DITHER_FLAG);//创建一个画笔  if(bitmap==null){   bitmap = Bitmap.createBitmap(900, 1200, Bitmap.Config.ARGB_8888); //设置位图的宽高  }  canvas=new Canvas();  canvas.setBitmap(bitmap);  paint.setStyle(Paint.Style.STROKE);//设置非填充  paint.setStrokeWidth(5);//笔宽5像素  paint.setColor(Color.RED);//设置为红笔  paint.setAntiAlias(true);//锯齿不显示 } @Override protected void onDraw(Canvas canvas) {  super.onDraw(canvas);  if(bitmap==null){   bitmap = Bitmap.createBitmap(900, 1200, Bitmap.Config.ARGB_8888); //设置位图的宽高  }  canvas.drawBitmap(bitmap,0,0,null); } public void clear(){  canvas.drawColor(Color.TRANSPARENT, PorterDuff.Mode.CLEAR); } @Override public boolean onTouchEvent(MotionEvent event) {  switch (event.getAction()){   case MotionEvent.ACTION_MOVE: //用户手指在屏幕上移动画线    canvas.drawLine(mov_x,mov_y,event.getX(),event.getY(),paint);    invalidate();    break;   case MotionEvent.ACTION_DOWN://用户手指按下时画起点    mov_x=(int) event.getX();    mov_y=(int) event.getY();    canvas.drawPoint(mov_x,mov_y,paint);    invalidate();    break;   case MotionEvent.ACTION_UP:    break;  }  mov_x=(int) event.getX();  mov_y=(int) event.getY();  return true;  //return super.onTouchEvent(event); } private int mov_x;//声明起点x坐标 private int mov_y;//声明起点y坐标 private Paint paint;//声明画笔 private Canvas canvas;//画布 private Bitmap bitmap;//位图 private int blcolor;}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center_horizontal" android:padding="10dp" android:orientation="vertical"> <com.view.MDrawLineView  android:id="@+id/mDrawLine"  android:layout_width="300dp"  android:layout_height="400dp"  android:background="@drawable/bg_drawline" /> <Button  android:id="@+id/clearBut"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:text="清空" /></LinearLayout>

<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"> <!-- 描边--> <stroke android:width="2dp" android:color="#45c01a"></stroke> <!-- 填充颜色 --> <solid android:color="#fff"></solid> <!-- 圆角 --> <corners android:radius="10dp"></corners></shape>

package com.cktest;import android.os.Bundle;import android.support.annotation.Nullable;import android.support.v7.app.AppCompatActivity;import android.view.View;import android.widget.Button;import com.view.MDrawLineView;/** * Created by jiang on 2017/12/25. */public class DrawLineAct extends AppCompatActivity implements View.OnClickListener{ @Override protected void onCreate(@Nullable Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.act_drawline);  mDrawLine = (MDrawLineView) findViewById(R.id.mDrawLine);  clearBut = (Button) findViewById(R.id.clearBut);  clearBut.setOnClickListener(this); } @Override public void onClick(View v) {  switch (v.getId()){   case R.id.clearBut:    mDrawLine.clear();    break;  } } private MDrawLineView mDrawLine; private Button clearBut;}