一、main/assets路径下有raw图像文件，是一些图片的数据，这些是指纹图像。
二、现在我们需要读取出raw数据然后显示出来。
三、核心源码
1、
2、srcmainjavacomwfhcanvasdemoDataUtil.java
package com.wfh.canvasdemo;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import android.content.Context;
public class DataUtil {
private byte[] image;
public static String strarry1[] = { "01_00_00.raw", "01_00_01.raw",
"01_00_02.raw", "01_00_03.raw", "01_00_04.raw", "01_00_05.raw",
"01_00_06.raw", "01_00_07.raw", "01_00_08.raw", "01_00_09.raw",
"01_00_10.raw", "01_00_11.raw", "01_00_12.raw", "01_00_13.raw",
"01_00_14.raw", "01_00_15.raw", "01_00_16.raw", "01_00_17.raw",
"01_00_18.raw", "01_00_19.raw", "01_00_20.raw", "01_00_21.raw",
"01_00_22.raw", "01_00_23.raw", "01_00_24.raw", "01_00_25.raw",
"01_00_26.raw", "01_00_27.raw", "01_00_28.raw", "01_00_29.raw",
"01_00_30.raw", "01_00_31.raw", "01_00_32.raw", "01_00_33.raw" };
public static String strarry2[] = { "02_00_00.raw", "02_00_01.raw",
"02_00_02.raw", "02_00_03.raw" };
private byte[] readStream(InputStream inStream) throws Exception {
//byte[] buffer = new byte[15600];
byte[] buffer = new byte[35600];
int len = -1;
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
while ((len = inStream.read(buffer)) != -1) {
outStream.write(buffer, 0, len);
}
byte[] data = outStream.toByteArray();
outStream.close();
inStream.close();
return data;
}
public byte[] setRawData(Context context, String fileName)
throws Exception {
try {
image = null;
InputStream inputStream = context.getResources().getAssets()
.open(fileName);
image = readStream(inputStream);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return image;
}
}
2、srcmainjavacomwfhcanvasdemoMainActivity.java
package com.wfh.canvasdemo;
import java.io.File;
import java.io.FileOutputStream;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnTouchListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.Toast;
import static java.lang.Long.toHexString;
public class MainActivity extends Activity implements View.OnTouchListener{
private Button btn_save, btn_resume;
private ImageView iv_canvas;
private Bitmap baseBitmap;
private Canvas canvas;
private Paint paint;
// 定义手指开始触摸的坐标
float startX;
float startY;
//int[] data= new int[25600];
byte[] image = null;
private DataUtil mDataUtil;
String[] flies = null;
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
// 用户按下动作
case MotionEvent.ACTION_DOWN:
int x,y;
// 第一次绘图初始化内存图片，指定背景为白色
if (baseBitmap == null) {
baseBitmap = Bitmap.createBitmap(iv_canvas.getWidth(),
iv_canvas.getHeight(), Bitmap.Config.ARGB_8888);
canvas = new Canvas(baseBitmap);
canvas.drawColor(Color.YELLOW);
}
// 记录开始触摸的点的坐标
startX = event.getX();
startY = event.getY();
String str="#000000";
x=0;
int m;
try {
image = mDataUtil.setRawData(MainActivity.this, "1"
+ "/" + "01_00_00.raw");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
if (image == null) {
Toast.makeText(MainActivity.this, "Failed to read image", Toast.LENGTH_SHORT).show();
}
else
{
Toast.makeText(MainActivity.this, "success to read image", Toast.LENGTH_SHORT).show();
for(y=0;y<160;y++)
{
for (x = 0; x < 160; x++) {
m=(int)image[159-x+y*160]&0xff;
if(m<0x10)
str = "#" +"0"+toHexString(m) +"0"+ toHexString(m)+"0" + toHexString(m);
else
str = "#" + toHexString(m) + toHexString(m) + toHexString(m);
paint.setColor(Color.parseColor(str));
canvas.drawPoint(startX + 3*x, startY+3*y, paint);
}
}
}
iv_canvas.setImageBitmap(baseBitmap);
break;
// 用户手指在屏幕上移动的动作
case MotionEvent.ACTION_MOVE:
break;
case MotionEvent.ACTION_UP:
break;
default:
break;
}
return true;
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 初始化一个画笔，笔触宽度为5，颜色为红色
paint = new Paint();
// paint.setStrokeWidth(20);
paint.setStrokeWidth(3);
paint.setColor(Color.RED);
iv_canvas = (ImageView) findViewById(R.id.iv_canvas);
btn_save = (Button) findViewById(R.id.btn_save);
btn_resume = (Button) findViewById(R.id.btn_resume);
btn_save.setonClickListener(click);
btn_resume.setonClickListener(click);
// iv_canvas.setonTouchListener(touch);
iv_canvas.setonTouchListener(this);
mDataUtil = new DataUtil();
}
private View.onClickListener click = new onClickListener() {
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.btn_save:
saveBitmap();
break;
case R.id.btn_resume:
resumeCanvas();
break;
default:
break;
}
}
};
protected void saveBitmap() {
try {
// 保存图片到SD卡上
File file = new File(Environment.getExternalStorageDirectory(),
System.currentTimeMillis() + ".png");
FileOutputStream stream = new FileOutputStream(file);
baseBitmap.compress(CompressFormat.PNG, 100, stream);
Toast.makeText(MainActivity.this, "保存图片成功", Toast.LENGTH_SHORT).show();
// Android设备Gallery应用只会在启动的时候扫描系统文件夹
// 这里模拟一个媒体装载的广播，用于使保存的图片可以在Gallery中查看
Intent intent = new Intent();
intent.setAction(Intent.ACTION_MEDIA_MOUNTED);
intent.setData(Uri.fromFile(Environment
.getExternalStorageDirectory()));
sendBroadcast(intent);
} catch (Exception e) {
Toast.makeText(MainActivity.this, "保存图片失败", Toast.LENGTH_SHORT).show();
e.printStackTrace();
}
}
protected void resumeCanvas() {
// 手动清除画板的绘图，重新创建一个画板
if (baseBitmap != null) {
baseBitmap = Bitmap.createBitmap(iv_canvas.getWidth(),
iv_canvas.getHeight(), Bitmap.Config.ARGB_8888);
canvas = new Canvas(baseBitmap);
canvas.drawColor(Color.YELLOW);
iv_canvas.setImageBitmap(baseBitmap);
Toast.makeText(MainActivity.this, "清除画板成功，可以重新开始绘图", Toast.LENGTH_LONG).show();
}
}
}
四、运行测试效果图
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