首先需要加入权限
检查网络状态代码如下
| 代码如下 |
复制代码 |
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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;
}
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效果如下，用户可以点击确定来设置网络，比如启动wifi
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如果希望网络连接时做一些事情的话，需要判断当前网络状态是否为true，为真则进行一些操作，否则设置网络。还可以用另外一种方式，其实差不多
| 代码如下 |
复制代码 |
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//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
{
if(info[i].getState()==NetworkInfo.State.CONNECTED)
{
return true;
}
}
}
}
return false;
}
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然后通过判断如果当前状态可用则执行相关代码，不可用则设置网络
| 代码如下 |
复制代码 |
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if(isNetworkAvailable())
{
相关代码
}else
{
setNetwork();
}]
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这篇文章中已经介绍了网络状态的判断，但是测试后发现用此方法只能够判断WIFI是否连接，而现在的智能机可以是wifi、3G、甚至2G。那么如果用上面的方法就不行了需要进行一下修改，使其在网络不连接（无论wifi、3G、2G）的时候也可以判断。代码如下
| 代码如下 |
复制代码 |
//Check network
public void CheckNetworkState()
{
boolean flag = false;
ConnectivityManager manager = (ConnectivityManager)getSystemService(
Context.CONNECTIVITY_SERVICE);
State mobile = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();
State wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();
//如果3G、wifi、2G等网络状态是连接的，则退出，否则显示提示信息进入网络设置界面
if(mobile == State.CONNECTED||mobile==State.CONNECTING)
return;
if(wifi == State.CONNECTED||wifi==State.CONNECTING)
return;
showTips();
}
private void showTips()
{
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) {
// 如果没有网络连接，则进入网络设置界面
startActivity(new Intent(Settings.ACTION_WIRELESS_SETTINGS));
}
});
builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
builder.create();
builder.show();
}
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种方式更加简单，也更加有用，当然第一篇也有可取之处，可以加入3G状态检查即可
注意：别忘了加上权限
