关于Android Studio 配置JNI的请看文章:
安卓学习–Android studio 1.5 JNI开发初探
安卓JNI–JNI底层C回调Java方法
关于Android Studio导入源码库请看文章:
导入maven源码库
app/build.gradle文件添加库支持
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
testCompile 'junit:junit:4.12'
compile 'com.android.support:appcompat-v7:23.1.1'
compile 'com.android.support:percent:23.1.1' //百分比库
compile 'com.bigkoo:pickerview:1.0.3' //TimePopupWindow库
}
布局XML(使用了百分比布局)
<?xml version="1.0" encoding="utf-8"?>
<android.support.percent.PercentRelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.lianghuiyong.time.MainActivity">
<android.support.percent.PercentRelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_heightPercent = "50%">
<TextView
android:id="@+id/textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="30sp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
app:layout_marginTopPercent = "35%"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="设置时间"
android:id="@+id/button"
android:textSize="25sp"
android:layout_below="@+id/textview"
android:layout_centerHorizontal="true"
app:layout_marginTopPercent="15%" />
</android.support.percent.PercentRelativeLayout>
</android.support.percent.PercentRelativeLayout>
MainActivity.java
package com.example.lianghuiyong.time;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.bigkoo.pickerview.TimePopupWindow;
import java.util.Calendar;
import java.util.Date;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
public class MainActivity extends AppCompatActivity {
static {
System.loadLibrary("timecount-jni");
}
public native void timecount(int h,int m);
private int hour = 0;
private int min = 0;
private int sec = 0;
private Handler handler =null;
private TextView textView = null;
private Button button = null;
private volatile boolean isstop = false;
private volatile boolean isstar = true;
private TimePopupWindow pickerView = null;
private ExecutorService pool = null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = (TextView)findViewById(R.id.textview);
button = (Button)findViewById(R.id.button);
this.Config_PickerView();
this.HandlerGetData();//handler 更新UI
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
pickerView.showAtLocation(v, Gravity.BOTTOM, 0, 0);
}
});
}
/*
* 配置pickerView
* */
private void Config_PickerView(){
pool = Executors.newSingleThreadExecutor(); //采用线程池单一线程方式
pickerView = new TimePopupWindow(MainActivity.this, TimePopupWindow.Type.HOURS_MINS);
pickerView.setTime(new Date(2015 - 1900, 12, 10, 0, 0));//设置时间
pickerView.setCyclic(true); //循环滚动
//监听pickerView按下确定按钮
pickerView.setOnTimeSelectListener(new TimePopupWindow.OnTimeSelectListener() {
@Override
public void onTimeSelect(Date date) {
IfThreadSetStop();
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
final int set_hour = calendar.get(Calendar.HOUR_OF_DAY);
final int set_min = calendar.get(Calendar.MINUTE);
pool.execute(new Runnable() {
@Override
public void run() {
Log.d("lhy", "按下确定调用JNI:set_hour = " + set_hour + "; set_min = " + set_min);
timecount(set_hour, set_min);
}
});
}
});
}
//判断线程是不是第一个,如果不是,则把isstop置为false,JNI回调时会结束无限循环
private void IfThreadSetStop(){
if (!isstar)
isstop = true;
isstar = false;
}
/*
* 通过handle获取msg里的值
* */
private void HandlerGetData(){
handler = new Handler(){
@Override
public void handleMessage(Message msg) {
switch (msg.what){
case 1:
Bundle bundle = msg.getData();
hour = bundle.getInt("hour");
min = bundle.getInt("min");
sec = bundle.getInt("sec");
textView.setText(String.format("%02d", hour) + ":" +String.format("%02d", min) + ":" + String.format("%02d", sec));
break;
}
super.handleMessage(msg);
}
};
textView.setText(String.format("%02d", hour) + ":" + String.format("%02d", min) + ":" + String.format("%02d", sec));
}
/*
*JNI回调用来传递时间
* */
private void MsgSetData(int h,int m,int s){
Message msg = new Message();
msg.what = 1;
Bundle bundle = new Bundle();
bundle.putInt("hour",h);
bundle.putInt("min",m);
bundle.putInt("sec",s);
msg.setData(bundle);
handler.sendMessage(msg);
Log.d("lhy", "JNI sendMessage OK!--" + h + ":" + m + ":" + s);
}
}
timecount-jni.c
#include <jni.h>
#include <unistd.h>
JNIEXPORT void JNICALL
Java_com_example_lianghuiyong_time_MainActivity_timecount(JNIEnv *env, jobject instance, jint h,
jint m) {
// TODO
jclass mainactivity = (*env)->FindClass(env ,"com/example/lianghuiyong/time/MainActivity");
jmethodID MsgSetData = (*env)->GetMethodID(env,mainactivity,"MsgSetData","(III)V");
jfieldID isstopID = (*env)->GetFieldID(env,mainactivity,"isstop","Z");
volatile jboolean isstop = NULL;
isstop= (*env)->GetBooleanField(env,instance,isstopID);
int s=0; //初始化秒为0
//回调Java的MsgSetData方法更新UI
(*env)->CallVoidMethod(env,instance,MsgSetData,h,m,s);
while ((!isstop)&&( h>=0 && m>=0 && s>=0)){
if( s>0 ){
--s;
} else if( m>0 && s==0 ){
--m;
s = 59;
} else if(h>0 && m==0 && s==0 ){
--h;
m = 59;
s = 59;
}
sleep(1);
//回调Java的MsgSetData方法更新UI
(*env)->CallVoidMethod(env,instance,MsgSetData,h,m,s);
isstop = (*env)->GetBooleanField(env,instance,isstopID);
}
//结束时重置Java属性isstop为false
(*env)->SetBooleanField(env,instance,isstopID,JNI_FALSE);
//回收资源
(*env)->DeleteGlobalRef(env,instance);
}
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