这篇的内容使用到的是android.gesture包，具体的例子参考的是sample中gesturebuilder程序。
1、手势创建
手势创建主要用到gestureoverlayview和gesturelibrary。gestureoverlayview的父类为android.widget.framelayout，是手势绘图区。gesturelibrary类主要对手势进行保存、删除等操作的，存放手势的仓库。下面给出创建手势的例子，如下图，可以定义如图手势打开csdn.net
1.1、创建绘图区
gestureoverlayview overlay = (gestureoverlayview) findviewbyid(r.id.gestures_overlay);
overlay.setgesturestroketype(gestureoverlayview.gesture_stroke_type_multiple);
overlay.setfadeoffset(2000); //多笔画每两次的间隔时间
overlay.setgesturecolor(color.cyan);//画笔颜色
overlay.setgesturestrokewidth(6);//画笔粗细值
overlay.addongesturelistener(new gesturesprocessor());
1.2、监听绘制
private class gesturesprocessor implements gestureoverlayview.ongesturelistener {
public void ongesturestarted(gestureoverlayview overlay, motionevent event) {
mdonebutton.setenabled(false);
mgesture = null;
}
public void ongesture(gestureoverlayview overlay, motionevent event) {
}
public void ongestureended(gestureoverlayview overlay, motionevent event) {
mgesture = overlay.getgesture();
if (mgesture.getlength() < length_threshold) {
overlay.clear(false);
}
mdonebutton.setenabled(true);
}
public void ongesturecancelled(gestureoverlayview overlay, motionevent event) {
}
}
1.3、保存手势
public void addgesture(view v) {
if (mgesture != null) {
final textview input = (textview) findviewbyid(r.id.gesture_name);
final charsequence name = input.gettext();
if (name.length() == 0) {
input.seterror(getstring(r.string.error_missing_name));
return;
}
/**
* 获取手势库
* private final file mstorefile = new file(environment.getexternalstoragedirectory(), "gestures");
* gesturelibrary sstore = gesturelibraries.fromfile(mstorefile);
*
*/
final gesturelibrary store = gesturebuilderactivity.getstore();
store.addgesture(name.tostring(), mgesture);
store.save();
setresult(result_ok);
final string path = new file(environment.getexternalstoragedirectory(),
"gestures").getabsolutepath();
toast.maketext(this, getstring(r.string.save_success, path), toast.length_long).show();
} else {
setresult(result_canceled);
}
finish();
}
2、手势识别
手势识别也是经过创建绘图区、监听绘制、比对结果三个过程，这里直接给出代码。
public class gestureperformedactivity extends activity {
private final file mstorefile = new file(
environment.getexternalstoragedirectory(), "gestures");
// 手势库
gesturelibrary mgesturelib;
@override
protected void oncreate(bundle savedinstancestate) {
// todo auto-generated method stub
super.oncreate(savedinstancestate);
setcontentview(r.layout.gesture_perform);
// 手势画板
gestureoverlayview gestures = (gestureoverlayview) findviewbyid(r.id.gestures_overlay);
gestures.setgesturestroketype(gestureoverlayview.gesture_stroke_type_multiple);
gestures.setfadeoffset(2000); // 多笔画每两次的间隔时间
gestures.setgesturecolor(color.cyan);// 画笔颜色
gestures.setgesturestrokewidth(6);// 画笔粗细值
// 手势识别的监听器
gestures.addongestureperformedlistener(new gestureoverlayview.ongestureperformedlistener() {
@override
public void ongestureperformed(gestureoverlayview overlay,
gesture gesture) {
// 从手势库中查询匹配的内容，匹配的结果可能包括多个相似的结果，匹配度高的结果放在最前面
arraylist<prediction> predictions = mgesturelib
.recognize(gesture);
if (predictions.size() > 0) {
prediction prediction = (prediction) predictions.get(0);
// 匹配的手势
if (prediction.score > 1.0) { // 越匹配score的值越大，最大为10
toast.maketext(gestureperformedactivity.this,
prediction.name, toast.length_short).show();
}
}
}
});
if (mgesturelib == null) {
mgesturelib = gesturelibraries.fromfile(mstorefile);
mgesturelib.load();
}
}
}
