实例详解用户输入 i. 检测常用手势

<textview 
android:id="@+id/gesture" 
android:layout_width="match_parent" 
android:layout_height="150dp" 
android:gravity="center" 
android:text="单击手势变化" /><textview 
android:id="@+id/doubletap" 
android:layout_width="match_parent" 
android:layout_height="150dp" 
android:gravity="center" 
android:text="双击手势变化" /> 

public class mainactivity extends activity
{ 
private static final string log_tag = "hellogesture"; 
private gesturedetector mgesturedetector = null; 
private textview mgesturetextview = null; 
private textview mdoubletaptextview = null; 
@override 
protected void oncreate(bundle savedinstancestate) 
{ 
super.oncreate(savedinstancestate); 
setcontentview(r.layout.activity_main); 
mgesturetextview = (textview) findviewbyid(r.id.gesture); 
mdoubletaptextview = (textview) findviewbyid(r.id.doubletap); 
// 构造gesturedetector对象，传入监听器对象 
mgesturedetector = new gesturedetector(this, mongesturelistener); 
// 传入双击监听器对象 
mgesturedetector.setondoubletaplistener(mdoubletaplistener); 
} 
@override public boolean ontouchevent(motionevent event) 
{ 
// 在ontouchevent方法中将事件传递给手势检测对象，否则手势监听对象中的回调函数是不会被调用的 
mgesturedetector.ontouchevent(event); 
return super.ontouchevent(event); 
} 
private ongesturelistener mongesturelistener = new ongesturelistener()
{ 
@override 
public boolean onsingletapup(motionevent e) 
{ 
log.i(log_tag, "onsingletapup: " + e.tostring()); 
mgesturetextview.settext("onsingletapup: "); 
return false; 
} 
@override 
public void onshowpress(motionevent e) 
{ 
log.i(log_tag, "onshowpress: " + e.tostring()); 
mgesturetextview.settext("onshowpress: "); 
} 
@override 
public boolean onscroll(motionevent e1, motionevent e2, 
float distancex, float distancey)
{ 
log.i(log_tag, "onscroll: " + e1.tostring() + ", " + e2.tostring()); 
mgesturetextview.settext("onscroll "); 
return false; 
} @override 
public void onlongpress(motionevent e)
{ 
log.i(log_tag, "onlongpress: " + e.tostring()); 
mgesturetextview.settext("onlongpress: "); 
} 
@override 
public boolean onfling(motionevent e1, motionevent e2, float velocityx, 
float velocityy) 
{ 
log.i(log_tag, "onfling: " + e1.tostring() + ", " + e2.tostring()); 
mgesturetextview.settext("onfling "); 
return false; 
} 
@override 
public boolean ondown(motionevent e) 
{ 
log.i(log_tag, "ondown: " + e.tostring()); 
mgesturetextview.settext("ondown: "); 
return false; 
} 
}; private ondoubletaplistener mdoubletaplistener = new ondoubletaplistener() 
{ 
@override 
public boolean onsingletapconfirmed(motionevent e) 
{ 
log.i("log_tag", "onsingletapconfirmed: " + e.tostring()); 
mdoubletaptextview.settext("onsingletapconfirmed: "); 
return false; 
} 
@override 
public boolean ondoubletapevent(motionevent e) 
{ 
log.i("log_tag", "ondoubletapevent: " + e.tostring()); 
mdoubletaptextview.settext("ondoubletapevent: "); 
return false; 
} 
@override 
public boolean ondoubletap(motionevent e) 
{ 
log.i("log_tag", "ondoubletap: " + e.tostring()); 
mdoubletaptextview.settext("ondoubletap: "); 
return false; 
} 
};} 

public class mainactivity extends activity 
{ 
private gesturedetector mgesturedetector = null; 
private textview mgesturetextview = null; 
private textview mdoubletaptextview = null; 
@override 
protected void oncreate(bundle savedinstancestate) 
{ 
super.oncreate(savedinstancestate); 
setcontentview(r.layout.activity_main); 
mgesturetextview = (textview) findviewbyid(r.id.gesture); 
mdoubletaptextview = (textview) findviewbyid(r.id.doubletap); 
// 构造gesturedetector对象，传入监听器对象 
mgesturedetector = new gesturedetector(this, new mygesturelistener()); 
// 传入双击监听器对象 
} 
@override 
public boolean ontouchevent(motionevent event) 
{ 
// 在ontouchevent方法中将事件传递给手势检测对象，否则手势监听对象中的回调函数是不会被调用的 
this.mgesturedetector.ontouchevent(event); 
return super.ontouchevent(event); 
} 
class mygesturelistener extends gesturedetector.simpleongesturelistener 
{ 
private static final string debug_tag = "gestures"; 
@override 
public boolean onfling(motionevent e1, motionevent e2, float velocityx, 
float velocityy) 
{ 
log.d(debug_tag, "onfling: " + e1.tostring() + ", " + e2.tostring()); 
mgesturetextview.settext("onfling "); 
return false; 
} 
@override 
public boolean ondown(motionevent e)
{ 
log.d(debug_tag, "ondown: " + e.tostring()); 
mgesturetextview.settext("ondown: "); 
return false; 
} 
}}