继承CordovaPlugin类实现Activity调用

package com.jiatianxia.version;


import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.cordova.CallbackContext;
import org.apache.cordova.CordovaPlugin;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.util.Log;


public class Version extends CordovaPlugin{
// 作为回调传递参数
CallbackContext callbackContext;
String newVerName = "";// 新版本名称
int newVerCode = -1;// 新版本号
ProgressDialog pd = null;
String UPDATE_SERVERAPK = "软件.apk";
@Override
public boolean execute(String action, JSONArray args,
CallbackContext callbackContext) throws JSONException {
this.callbackCOntext= callbackContext;
if (action.equals("upVersion")) {
updateVersion();
callbackContext.success("调用成功");
} else {
return false;
}

callbackContext.success();
return true;

}

// 判断是否更新版本
public void updateVersion() {
if (getServerVer()) {
int verCode = this.getVerCode(cordova.getActivity());
if (newVerCode > verCode) {
doNewVersionUpdate();// 更新版本
} else {
notNewVersionUpdate();// 提示已是最新版本
}
}
}

/**
 * 获得版本号
 */
public int getVerCode(Context context) {
int verCode = -1;
try {
String packName = context.getPackageName();
verCode = context.getPackageManager().getPackageInfo(packName, 0).versionCode;
} catch (NameNotFoundException e) {
// TODO Auto-generated catch block
Log.e("版本号获取异常", e.getMessage());
}
return verCode;
}

/**
 * 获得版本名称
 */
public String getVerName(Context context) {
String verName = "";
try {
String packName = context.getPackageName();
verName = context.getPackageManager().getPackageInfo(packName, 0).versionName;
} catch (NameNotFoundException e) {
Log.e("版本名称获取异常", e.getMessage());
}
return verName;
}

/**
 * 从服务器端获得版本号与版本名称
 * 
 * @return
 */
public boolean getServerVer() {
try {
URL url = new URL("服务器路径/version.text");
HttpURLConnection httpCOnnection= (HttpURLConnection) url
.openConnection();
httpConnection.setDoInput(true);
httpConnection.setDoOutput(true);
httpConnection.setRequestMethod("GET");
httpConnection.connect();
InputStreamReader reader = new InputStreamReader(
httpConnection.getInputStream());
BufferedReader bReader = new BufferedReader(reader);
String json = bReader.readLine();
JSONArray array = new JSONArray(json);
JSONObject jsOnObj= array.getJSONObject(0);
newVerCode = Integer.parseInt(jsonObj.getString("verCode"));
newVerName = jsonObj.getString("verName");
} catch (Exception e) {
e.printStackTrace();
return false;// 如果这里改为true 则不更新会退出程序
}
return true;
}

/**
 * 不更新版本
 */
public void notNewVersionUpdate() {
int verCode = this.getVerCode(cordova.getActivity());
String verName = this.getVerName(cordova.getActivity());
StringBuffer sb = new StringBuffer();
sb.append("当前版本：");
sb.append(verName);
sb.append(" Code:");
sb.append(verCode);
sb.append("\n已是最新版本，无需更新");
Dialog dialog = new AlertDialog.Builder(cordova.getActivity()).setTitle("软件更新")
.setMessage(sb.toString())
.setPositiveButton("确定", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
// finish();
}
}).create();
dialog.show();
}

/**
 * 下载apk
 */
public void downFile(final String url) {
pd.show();
new Thread() {
public void run() {
HttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet(url);
HttpResponse response;
try {
respOnse= client.execute(get);
HttpEntity entity = response.getEntity();
long length = entity.getContentLength();
InputStream is = entity.getContent();
FileOutputStream fileOutputStream = null;
if (is != null) {
File file = new File(
Environment.getExternalStorageDirectory(),
UPDATE_SERVERAPK);
fileOutputStream = new FileOutputStream(file);
byte[] b = new byte[1024];
int charb = -1;
int count = 0;
while ((charb = is.read(b)) != -1) {
fileOutputStream.write(b, 0, charb);
count += charb;

}
}
fileOutputStream.flush();
if (fileOutputStream != null) {
fileOutputStream.close();
}
down();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}.start();
}

/**
 * 更新版本
 */
public void doNewVersionUpdate() {
int verCode = this.getVerCode(cordova.getActivity());
String verName = this.getVerName(cordova.getActivity());
StringBuffer sb = new StringBuffer();
sb.append("当前版本：");
sb.append(verName);
sb.append(" Code:");
sb.append(verCode);
sb.append(",发现版本：");
sb.append(newVerName);
sb.append(" Code:");
sb.append(newVerCode);
sb.append(",是否更新");
Dialog dialog = new AlertDialog.Builder(cordova.getActivity())
.setTitle("软件更新")
.setMessage(sb.toString())
.setPositiveButton("更新", new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
pd = new ProgressDialog(cordova.getActivity());
pd.setTitle("正在下载");
pd.setMessage("请稍后");
pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
pd.setCancelable(false);
new Thread() {
double progress = 0;

public void run() {
try {
while (progress <94) {

// 由线程来控制进度
pd.setProgress((int) (progress += 0.18));
Thread.sleep(100);
}
while (progress > 100) {
pd.cancel();
}
} catch (Exception e) {
pd.cancel();
}
}
}.start();
downFile("服务器路径/软件名.apk");
}
})
.setNegativeButton("暂不更新",
new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog,
int which) {
// TODO Auto-generated method stub
// finish();
}
}).create();
// 显示更新框
dialog.show();
}

Handler handler = new Handler() {

@Override
public void handleMessage(Message msg) {

super.handleMessage(msg);
pd.cancel();
update();
}
};

/**
 * 下载完成，通过handler将下载对话框取消
 */
public void down() {
new Thread() {
public void run() {
Message message = handler.obtainMessage();
handler.sendMessage(message);
}
}.start();
}

/**
 * 安装应用
 */
public void update() {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File(Environment
.getExternalStorageDirectory(), UPDATE_SERVERAPK)),
"application/vnd.android.package-archive");
cordova.getActivity().startActivity(intent);
}

}

在上面的代码中我们通过Version extends CordovaPlugin类实现了不是Activity也可以进行对Activity的调用。关键方法

cordova.getActivity()