android应用客户端自动升级代码 （转）

android应用客户端自动升级代码

随着应用产品的不断发展，升级是不可避免的事情，做android应用开发的朋友们都会清楚，自己做的应用要不断的升级才能满足用户的需求，那么应用客户端的自动升级是怎么实现的呢?今天给大家分享一些代码如下，希望能够解决开发者朋友们的困惑：import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;

public class Update extends BaseActivity {
public ProgressDialog pBar;
private Handler handler =
new Handler();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.update);
Dialog dialog =
new AlertDialog.Builder(Update.this).setTitle("系统更新")
.setMessage("发现新版本，请更新！")// 设置内容
.setPositiveButton("确定",// 设置确定按钮
new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog,
int which) {
pBar =
new ProgressDialog(Update.this);
pBar.setTitle("正在下载");
pBar.setMessage("请稍候...");
pBar
.setProgressStyle(ProgressDialog.STYLE_SPINNER);
downFile("http://url:8765/OA.apk");

}

}).setNegativeButton("取消",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
// 点击"取消"按钮之后退出程序

}
}).create();// 创建
// 显示对话框
dialog.show();

}

void downFile(final String url) {
pBar.show();
new Thread() {
public void run() {
HttpClient client =
new DefaultHttpClient();
// params[0]代表连接的url
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(), "OA.apk");
fileOutputStream =
new FileOutputStream(file);

byte[] buf =
new
byte[1024];
int ch =
-1;
int count =
0;
while ((ch =
is.read(buf)) !=
-1) {
// baos.write(buf, 0, ch);
fileOutputStream.write(buf, 0, ch);
count += ch;
if (length >
0) {

}

}

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

}.start();

}

void down() {
handler.post(new Runnable() {
public void run() {
pBar.cancel();
update();
}
});

}

void update() {

Intent intent =
new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(Uri.fromFile(new File("/sdcard/OA.apk")),
"application/vnd.android.package-archive");
startActivity(intent);
}

}