当listview的item里面有button的时候，发现listview的onitemclick事件就无效了，解决两者冲突的方法是：button里面加上android:focusable="false"属性
phonegap在android的创建方法见连接：http://www.phonegapcn.com/developers/get-started-13/get-started
phonegap插件指的就是能够在js中被调用的java程序
phonegap-plugin的创建步骤：
1、用java程序编写java类
2、在js文件中创建java类并调用java方法
3、在android项目的配置文件中添加插件声明
4、在html文件中调用js文件，实现插件功能
例子如下：
Html文件：
<!DOCTYPE HTML> <html>
<head>
<meta name="viewport" content="width=320; user-scalable=no" />
<meta http-equiv="Content-type" content="text/html; charset=utf-8">
<title>Simple Plugin Demo</title>
<script type="text/javascript" charset="utf-8" src="/blog_article/cordova-1.7.0.js"></script>
<script type="text/javascript" charset="utf-8" src="/blog_article/simplePlugin.js"></script>
<script type="text/javascript" charset="utf-8">
document.addEventListener('deviceready', function() {
var btn = document.getElementById("hello"); //获得Button的ID
var textbox = document.getElementById("name"); //获得输入框的ID
var output = document.getElementById("output"); //获得输出的ID
btn.addEventListener('click', function() { //为Button添加点击的事件监听器
var text = textbox.value; //得到输入框的的内容
//window.plugins是固定的; //simpleplugin是JavaScript中PhoneGap.addPlugin('simpleplugin', new SimplePlugin()); 的那个'simpleplugin'插件名称 //hello是JavaScript中 SimplePlugin.prototype.hello方法的名字"hello" window.plugins.simpleplugin.hello(text, function(result)
{ //成功时执行，传入的是Javascript中对象方法的参数 output.innerHTML = result;//把输入框的的内容的内容显示在输出div上
}, function(err) { //错误时执行
// failure callback
output.innerHTML = 'err: ' + err
+ ', Failed to invoke simple plugin';
});
});
}, true);
</script>
</head>
<body>
<p>
<label for="name">Enter Name: </label> <input type="text" name="name"
id="name" value="" />
<button id="hello">Say Hello</button>
</p>
<p>
<div id="output"></div>
</p>
</body>
</html>
JavaScript文件：
var SimplePlugin = function() {};
SimplePlugin.prototype.hello = function(name, successCallback, failureCallback) {
// exec 內的參數分別是： Success Callback, Failure Callback, Registered Plugin name：就是在XML文件配置的那个所对应的name,
// 'hello'是传入Java文件的execute方法中的参数String action
// name (從 HTML 傳進來的參數)
return PhoneGap.exec(successCallback, failureCallback, 'SimplePlugin',
'hello', [ name ]);
};
// 这里是 PhoneGap Plugin 的註冊，Plugin 的名稱還有 Native Class 的名稱別打錯了，就是我們剛剛輸入的那些
PhoneGap.addConstructor(function() {
// Register the javascript plugin with PhoneGap
PhoneGap.addPlugin('simpleplugin', new SimplePlugin()); //simpleplugin是插件名称， new SimplePlugin()实例化的是本Javascript的类名 });
JAVA文件：
package org.apache.cordova.example;
import java.util.Date;
import org.apache.cordova.api.PluginResult.Status;
import org.json.JSONArray;
import org.json.JSONException;
import com.phonegap.api.Plugin;
import com.phonegap.api.PluginResult;
public class SimplePlugin extends Plugin {
public static String ACTION_HELLO = "hello";
@Override
public PluginResult execute(String action, JSONArray data, String callbackId) { //action和data是javascript传进来的参数 PluginResult pluginResult = null;
if (ACTION_HELLO.equals(action)) {
String name;
try {
name = data.getString(0);
String result = "Hello " + name + "! The time is "
+ (new Date()).toString();
pluginResult = new PluginResult(Status.OK, result);
return pluginResult;
} catch (JSONException e) {
pluginResult = new PluginResult(Status.JSON_EXCEPTION,
"missing argument name");
}
} else {
pluginResult = new PluginResult(Status.INVALID_ACTION,
"Allowed actions is hello");
}
return pluginResult;
}}
XML文件：
<plugins>
<plugin name="App" value="org.apache.cordova.App"/>
<plugin name="Geolocation" value="org.apache.cordova.GeoBroker"/>
<plugin name="Device" value="org.apache.cordova.Device"/>
<plugin name="Accelerometer" value="org.apache.cordova.AccelListener"/>
<plugin name="Compass" value="org.apache.cordova.CompassListener"/>
<plugin name="Media" value="org.apache.cordova.AudioHandler"/>
<plugin name="Camera" value="org.apache.cordova.CameraLauncher"/>
<plugin name="Contacts" value="org.apache.cordova.ContactManager"/>
<plugin name="File" value="org.apache.cordova.FileUtils"/>
<plugin name="NetworkStatus" value="org.apache.cordova.NetworkManager"/>
<plugin name="Notification" value="org.apache.cordova.Notification"/>
<plugin name="Storage" value="org.apache.cordova.Storage"/>
<plugin name="Temperature" value="org.apache.cordova.TempListener"/>
<plugin name="FileTransfer" value="org.apache.cordova.FileTransfer"/>
<plugin name="Capture" value="org.apache.cordova.Capture"/>
<plugin name="Battery" value="org.apache.cordova.BatteryListener"/>
<plugin name="SplashScreen" value="org.apache.cordova.SplashScreen"/>
<!--添加的插件-->
<plugin name="SimplePlugin" value="org.apache.cordova.example.SimplePlugin" /> //name是参见的名字 ;value是创建插件的全称类名</plugins>
此示例根据用户手指在屏幕的x轴方向上的位置，来选择频率并生成音频样本。
因为代码比较简单，那么话不多说，直接上代码。
public class FingerSynthesis extends Activity implements OnTouchListener
{
AudioSynthesisTask audioSynth;//播放音频样本的线程
static final float BASE_FREQUENCY = 440;//基准音频频率
float synth_frequency = BASE_FREQUENCY; // 440 Hz, 随着手指的移动会发生改变
boolean play = false;//控制是否生成音频样本
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
View mainView = this.findViewById(R.id.MainView);
mainView.setOnTouchListener(this);
audioSynth = new AudioSynthesisTask();
audioSynth.execute();
}
@Override
public void onPause()
{
super.onPause();
play = false;
finish();
}
public boolean onTouch(View v, MotionEvent event)
{
int action = event.getAction();
switch (action)
{
case MotionEvent.ACTION_DOWN:
play = true;//根据用户操作将play设置为true或者false
synth_frequency = event.getX() + BASE_FREQUENCY;//跟踪用户手指的位置，做出相应的改变
Log.v("FREQUENCY", "" + synth_frequency);
break;
case MotionEvent.ACTION_MOVE:
play = true;
synth_frequency = event.getX() + BASE_FREQUENCY;
Log.v("FREQUENCY", "" + synth_frequency);
break;
case MotionEvent.ACTION_UP:
play = false;
break;
case MotionEvent.ACTION_CANCEL:
break;
default:
break;
}
return true;
}
private class AudioSynthesisTask extends AsyncTask<Void, Void, Void>
{
@Override
protected Void doInBackground(Void... params)
{
final int SAMPLE_RATE = 11025;
int minSize = AudioTrack.getMinBufferSize(SAMPLE_RATE,
AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT);
AudioTrack audioTrack = new AudioTrack(AudioManager.STREAM_MUSIC,
SAMPLE_RATE, AudioFormat.CHANNEL_CONFIGURATION_MONO,
AudioFormat.ENCODING_PCM_16BIT, minSize,
AudioTrack.MODE_STREAM);
audioTrack.play();
short[] buffer = new short[minSize];
float angle = 0;
while (true)
{
if (play)
{
for (int i = 0; i < buffer.length; i++)
{
float angular_frequency = (float) (2 * Math.PI)
* synth_frequency / SAMPLE_RATE;
buffer[i] = (short) (Short.MAX_VALUE * ((float) Math
.sin(angle)));//生成音频样本
angle += angular_frequency;
}
audioTrack.write(buffer, 0, buffer.length);
} else
{
try
{
Thread.sleep(50);
} catch (InterruptedException e)
{
e.printStackTrace();
}
}
}
}
}
}