"JNI" Boiler pressure monitor

 Public classMainactivityextendsActivity {PrivateMyProgressBar PB; Static{system.loadlibrary ("Hello"); } @Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_main); PB=(MyProgressBar) Findviewbyid (R.ID.PB); Pb.setmax (100); }    Public voidStart (View v) {NewThread () { Public voidrun () {startmonitor ();       };   }.start (); }    Public voidStop (View v) {stopmonitor (); }        Public native voidStartMonitor ();  Public native voidStopmonitor ();  Public voidShowintpressure)   {pb.setpressure (pressure); }}

 Public classMyProgressBarextendsView {Private intpressure; Private intMax;  PublicMyProgressBar (context context, AttributeSet attrs,intDefstyle) {        Super(context, attrs, Defstyle); //TODO auto-generated Constructor stub    }     PublicMyProgressBar (Context context, AttributeSet attrs) {Super(context, attrs); //TODO auto-generated Constructor stub    }     PublicMyProgressBar (Context context) {Super(context); //TODO auto-generated Constructor stub    }     Public voidSetpressure (intpressure) {         This. Pressure =pressure; //Invalidates the current view, if the current view is visible, then the OnDraw is called and can only be used in the main thread//invalidate ();postinvalidate (); }     Public voidSetmax (intmax) {         This. Max =Max; } @Overrideprotected voidOnDraw (canvas canvas) {Paint Paint=NewPaint (); if(Pressure < 50) {paint.setcolor (color.green); }        Else if(Pressure < 80) {Paint.setcolor (0xffff8800); }        Else{paint.setcolor (color.red); } canvas.drawrect (Ten + max-pressure, 30, 10 +max, paint); }}

#include <jni.h>#include<stdio.h>#include<stdlib.h>intgetpressure () {//... Monitoring voltage ... Operation to get pressure value    returnRAND ()%101;}intMonitor; Jniexportvoidjnicall java_com_itheima_monitor_mainactivity_startmonitor (jnienv*env, Jobject obj) {Monitor=1;  while(monitor) {//Get Boiler pressure        intpressure =getpressure (); //Jclass (*findclass) (jnienv*, const char*);Jclass clazz = (*env)->findclass (env,"com/itheima/monitor/mainactivity"); //Jmethodid (*getmethodid) (jnienv*, Jclass, const char*, const char*);Jmethodid Methodid = (*env)->getmethodid (env, Clazz,"Show","(I) V"); //void (*callvoidmethod) (jnienv*, Jobject, Jmethodid, ...);(*env)Callvoidmethod (env, obj, methodid, pressure); Sleep (1); }}jniexportvoidjnicall java_com_itheima_monitor_mainactivity_stopmonitor (jnienv*env, Jobject obj) {Monitor=0;}

Application.mk

App_abi: = Armeabi x86

Android.mk

Local_path: = $ (call my-dir) include $ (clear_vars) local_module    := hellolocal_src_files:=  Hello.cinclude $ (build_shared_library)

"JNI" Boiler pressure monitor