package com.tomhw;
import java.util.Timer;
import java.util.TimerTask;
import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new MyView(this));
}
//能显示出手写轨迹的view
public class MyView extends SurfaceView implements Callback, Runnable{
//按下返回键即退出程序
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if (keyCode == KeyEvent.KEYCODE_BACK) {
finish();
}
return true;
}
//建立手写输入对象
long recognizer = 0;
long character = 0;
long result = 0;
int modelState = 0; //显示model文件载入状态
int strokes = 0; //总笔画数
boolean resultDisplay = false; //是否显示结果
int handwriteCount = 0; //笔画数
private Thread mThread;
SurfaceHolder mSurfaceHolder = null;
Canvas mCanvas = null;
Paint mPaint = null;
Path mPath = null;
Paint mTextPaint = null; //文字画笔
public static final int FRAME = 60;//画布更新帧数
boolean mIsRunning = false; //控制是否更新
float posX, posY; //触摸点当前座标
//触发定时识别任务
Timer tExit;
TimerTask task;
public MyView(Context context) {
super(context);
//设置拥有焦点
this.setFocusable(true);
//设置触摸时拥有焦点
this.setFocusableInTouchMode(true);
//获取holder
mSurfaceHolder = this.getHolder();
//添加holder到callback函数之中
mSurfaceHolder.addCallback(this);
//创建画布
mCanvas = new Canvas();
//创建画笔
mPaint = new Paint();
mPaint.setColor(Color.BLUE);//颜色
mPaint.setAntiAlias(true);//抗锯齿
//Paint.Style.STROKE 、Paint.Style.FILL、Paint.Style.FILL_AND_STROKE
//意思分别为 空心 、实心、实心与空心
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeCap(Paint.Cap.ROUND);//设置画笔为圆滑状
mPaint.setStrokeWidth(5);//设置线的宽度
//创建路径轨迹
mPath = new Path();
//创建文字画笔
mTextPaint = new Paint();
mTextPaint.setColor(Color.BLACK);
mTextPaint.setTextSize(15);
//创建手写识别
if (character == 0) {
character = characterNew();
characterClear(character);
characterSetWidth(character, 300);
characterSetHeight(character, 300);
}
if (recognizer == 0) {
recognizer = recognizerNew();
}
//打开成功返回1
modelState = recognizerOpen(recognizer, "/sdcard/handwriting-zh_CN.model");
if (modelState != 1) {
System.out.println("model文件打开失败");
}else{
System.out.println("model文件打开成功");
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
//获取触摸动作以及座标
int action = event.getAction();
float x = event.getX();
float y = event.getY();
//按触摸动作分发执行内容
switch (action) {
case MotionEvent.ACTION_DOWN:
if (tExit != null) {
tExit.cancel();
tExit = null;
task = null;
}
resultDisplay = false;
mPath.moveTo(x, y);//设定轨迹的起始点
break;
case MotionEvent.ACTION_MOVE:
mPath.quadTo(posX, posY, x, y); //随触摸移动设置轨迹
characterAdd(character, handwriteCount, (int)x, (int)y);
break;
case MotionEvent.ACTION_UP:
handwriteCount++;
tExit = new Timer();
task = new TimerTask() {
@Override
public void run() {
resultDisplay = true;
}
};
tExit.schedule(task, 1000);
break;
}
//记录当前座标
posX = x;
posY = y;
return true;
}
private void Draw(){
//防止canvas为null导致出现null pointer问题
if (mCanvas != null) {
mCanvas.drawColor(Color.WHITE); //清空画布
mCanvas.drawPath(mPath, mPaint); //画出轨迹
//数据记录
mCanvas.drawText("model打开状态 : " + modelState, 5, 20, mTextPaint);
mCanvas.drawText("触点X的座标 : " + posX, 5, 40, mTextPaint);
mCanvas.drawText("触点Y的座标 : " + posY, 5, 60, mTextPaint);
strokes = (int)characterStrokesSize(character);
mCanvas.drawText("总笔画数 : " + strokes, 5, 80, mTextPaint);
}
//进行文字检索
if (strokes > 0 && resultDisplay) {
result = recognizerClassify(recognizer, character, 10);
if (tExit != null) {
tExit.cancel();
tExit = null;
task = null;
}
characterClear(character);
strokes = 0;
mPath.reset();//触摸结束即清除轨迹
resultDisplay = false;
handwriteCount = 0;
}
//显示识别出的文字
if (result != 0) {
for (int i = 0; i < resultSize(result); i++) {
mCanvas.drawText(resultValue(result, i) + " : " + resultScore(result, i), 5, 100 + i * 20, mTextPaint);
}
}
}
@Override
public void run() {
while(mIsRunning){
//更新前的时间
long startTime = System.currentTimeMillis();
//线程安全锁
synchronized(mSurfaceHolder){
mCanvas = mSurfaceHolder.lockCanvas();
Draw();
mSurfaceHolder.unlockCanvasAndPost(mCanvas);
}
//获取更新后的时间
long endTime = System.currentTimeMillis();
//获取更新时间差
int diffTime = (int)(endTime - startTime);
//确保每次更新都为FRAME
while(diffTime <= FRAME){
diffTime = (int)(System.currentTimeMillis() - startTime);
//Thread.yield(): 与Thread.sleep(long millis):的区别，
//Thread.yield(): 是暂停当前正在执行的线程对象 ，并去执行其他线程。
//Thread.sleep(long millis):则是使当前线程暂停参数中所指定的毫秒数然后在继续执行线程
Thread.yield();
}
}
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
mIsRunning = true;
mThread = new Thread(this);
mThread.start();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height) {
// TODO Auto-generated method stub
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
resultDestroy(result);
characterDestroy(character);
recognizerDestroy(recognizer);
mThread = null;
}
}
//jni封装方法的声明
//charater
public native long characterNew();
public native void characterDestroy(long c);
public native void characterClear(long stroke);
public native int characterAdd(long character, long id, int x, int y);
public native void characterSetWidth(long character, long width);
public native void characterSetHeight(long character, long height);
public native long characterStrokesSize(long character);
//recognizer
public native long recognizerNew();
public native void recognizerDestroy(long recognizer);
public native int recognizerOpen(long recognizer, String filename);
public native String recognizerStrerror(long recognizer);
public native long recognizerClassify(long recognizer, long character, long nbest);
//result
public native String resultValue(long result, long index);
public native float resultScore(long result, long index);
public native long resultSize(long result);
public native void resultDestroy(long result);
//载入.so文件
static{
System.loadLibrary("zinniajni");
}
}
