TQ210搭载Android4.0.3系统构建之BEEP从驱动到HAL到JNI到应用程序(上层应用篇)

其实上层应用篇 很简单

对于BeepActivity.java 可能需要注意一下的就是 包名、类名、方法名的编写一定要与JNI层定义的方法名要一致 不然会提示找不到JNI层的方法的

比如 包名com.under.beep 类名BeepActivity 方法名beepOn

BeepActivity.java

package com.under.beep;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.view.Menu;
import android.view.View;
import android.widget.CheckBox;

public class BeepActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_beep);
if(!beepInit())  //蜂鸣器初始化函数
{
new AlertDialog.Builder(BeepActivity.this).setTitle("error").setMessage("failed to init beep.").setPositiveButton("确定", null).show();
}
}

public void checkOnOff(View view)
{
switch (view.getId()) {
case R.id.checkBox1: //蜂鸣器的单击事件
CheckBox checkBox=(CheckBox)view;
if(checkBox.isChecked()) beepOn(1);
else beepOff(0);
break;
case R.id.button1:  //退出系统
this.finish();
break;
}

}

//本地函数
public native boolean beepOn(int cmd);
public native boolean beepOff(int cmd);
public native boolean beepInit();
public native boolean beepClose();

//加载动态共享库
static{
System.loadLibrary("beepunder");
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.beep, menu);
return true;
}

}

布局文件

activity_beep.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/LinearLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".BeepActivity" >

<CheckBox
android:id="@+id/checkBox1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="checkOnOff"
android:text="打开蜂鸣器" />

<Button
android:id="@+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="checkOnOff"
android:text="退出" />

</LinearLayout>