Android开发小技巧汇总

1.Android根据包名打开应用：

public void startAPP(String appPackageName){
  try{
   Intent intent = this.getPackageManager().getLaunchIntentForPackage(appPackageName);
   startActivity(intent);
  }catch(Exception e){
   Toast.makeText(this, "没有安装", Toast.LENGTH_LONG).show();
  }
 }

2.Android根据包名判断是否安装某个应用：

public static boolean checkApkExist(Context context, String packageName) {
  if (packageName == null || "".equals(packageName))
   return false;
  try {
   ApplicationInfo info = context.getPackageManager()
     .getApplicationInfo(packageName,
       PackageManager.GET_UNINSTALLED_PACKAGES);
   return true;
  } catch (NameNotFoundException e) {
   return false;
  }
 }

3.Android检查是否有网络访问：

public static boolean isNetworkAvaliable(Context context) {
  // 获取所有连接管理对象
  ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
  if (null != cm) {
   // 获取网络连接管理的对象
   NetworkInfo info = cm.getActiveNetworkInfo();
   if (null != info && info.isConnected()) {
    // 判断当前网络是否已经连接
    if (NetworkInfo.State.CONNECTED == info.getState()) {
     return true;
    }
   }
  }
  return false;
 }

4.Android获取设置下面帐户信息：

Account[] accounts = AccountManager.get(this).getAccounts();
  for(Account account : accounts){
   LogUtil.e("tag", account.name+","+account.type+","+account.describeContents());
  }

记得添加权限：<uses-permission android:name="android.permission.GET_ACCOUNTS" />

5.监听ListView滑动到底部：

listview.setOnScrollListener(new OnScrollListener(){  
    @Override  
    public void onScrollStateChanged(AbsListView view, int scrollState){  
        // 当不滚动时  
        if (scrollState == OnScrollListener.SCROLL_STATE_IDLE) {  
            // 判断是否滚动到底部  
            if (view.getLastVisiblePosition() == view.getCount() - 1) {  
                //加载更多功能的代码  
            }  
        }  
    }  
});