許多連網應用都在開始啟動並執行時候檢查當前網路狀態,如果沒有開啟則去開啟它,記錄一下以前寫程式時的網路檢查,發現人的記憶力真是有限,總是隔段時間久忘記,所以記錄下來是最好的記憶。
我們可以在一開始啟動程式的時候檢查網路連接狀況,如果沒有開啟則彈出對話方塊設定網路
首先需要加入許可權
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permission android:name="android.permission.INTERNET"/>
檢查網路狀態碼如下
public boolean CheckNetworkState()
{
boolean flag = false;
ConnectivityManager manager = (ConnectivityManager)getSystemService(
Context.CONNECTIVITY_SERVICE);
if(manager.getActiveNetworkInfo() != null)
{
flag = manager.getActiveNetworkInfo().isAvailable();
}
if(!flag)
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setIcon(android.R.drawable.ic_dialog_alert);
builder.setTitle(R.string.netstate);
builder.setMessage(R.string.setnetwork);
builder.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Intent mIntent = new Intent("/");
ComponentName comp = new ComponentName("com.android.settings",
"com.android.settings.WirelessSettings");
mIntent.setComponent(comp);
mIntent.setAction("android.intent.action.VIEW");
startActivity(mIntent);
}
});
builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.create();
builder.show();
}
return flag;
}
效果如下,使用者可以點擊確定來設定網路,比如啟動wifi
-------------------------------------------------------------------------------------------------
如果希望網路連接時做一些事情的話,需要判斷當前網路狀態是否為true,為真則進行一些操作,否則設定網路。還可以用另外一種方式,其實差不多
//setnetwork
public void setNetwork()
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setIcon(android.R.drawable.ic_dialog_alert);
builder.setTitle(R.string.netstate);
builder.setMessage(R.string.setnetwork);
builder.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
Intent mIntent = new Intent("/");
ComponentName comp = new ComponentName("com.android.settings",
"com.android.settings.WirelessSettings");
mIntent.setComponent(comp);
mIntent.setAction("android.intent.action.VIEW");
startActivity(mIntent);
}
});
builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.create();
builder.show();
}
//NETWORK
public boolean isNetworkAvailable()
{
Context context = getApplicationContext();
ConnectivityManager connect = (ConnectivityManager)context.getSystemService(
Context.CONNECTIVITY_SERVICE);
if(connect==null)
{
return false;
}else//get all network info
{
NetworkInfo[] info = connect.getAllNetworkInfo();
if(info!=null)
{
for(int i=0;i<info.length;i++)
{
if(info[i].getState()==NetworkInfo.State.CONNECTED)
{
return true;
}
}
}
}
return false;
}
然後通過判斷如果目前狀態可用則執行相關代碼,不可用則設定網路
if(isNetworkAvailable())
{
相關代碼
}else
{
setNetwork();
}