Android(安卓)handler用法详解二（例2）

直接看代码：

public class Update extends Activity {

public ProgressDialog pBar;
private Handler handler = new Handler();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.smt);
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://localhost:8080/examples/images/Blockx_3D.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(), "Blockx_3D.apk");
fileOutputStream = new FileOutputStream(file);
byte[] buf = new byte[1024];
int ch = -1;
int count = 0;
while ((ch = is.read(buf)) != -1) {
fileOutputStream.write(buf, 0, ch);
count += ch;
if (length > 0) {
}
}
}
fileOutputStream.flush();
if (fileOutputStream != null) {
fileOutputStream.close();
}
down();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
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/Blockx_3D.apk")), "application/vnd.android.package-archive");
startActivity(intent);
}
}

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