本文章先是介紹了判斷wifi的網(wǎng)絡(luò)狀態(tài)，這個(gè)明顯就會(huì)有問題，現(xiàn)在的網(wǎng)絡(luò)有3G、2G那我們肯定不能少這兩個(gè)啊，后面的程序加以更證了，有需要的同學(xué)可以看看。
首先需要加入權(quán)限
代碼如下 |
復(fù)制代碼 |
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permission android:name="android.permission.INTERNET"/> |
檢查網(wǎng)絡(luò)狀態(tài)代碼如下
代碼如下 |
復(fù)制代碼 |
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，用戶可以點(diǎn)擊確定來設(shè)置網(wǎng)絡(luò)，比如啟動(dòng)wifi
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如果希望網(wǎng)絡(luò)連接時(shí)做一些事情的話，需要判斷當(dāng)前網(wǎng)絡(luò)狀態(tài)是否為true，為真則進(jìn)行一些操作，否則設(shè)置網(wǎng)絡(luò)。還可以用另外一種方式，其實(shí)差不多
代碼如下 |
復(fù)制代碼 |
//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;
}
|
然后通過判斷如果當(dāng)前狀態(tài)可用則執(zhí)行相關(guān)代碼，不可用則設(shè)置網(wǎng)絡(luò)
代碼如下 |
復(fù)制代碼 |
if(isNetworkAvailable())
{
相關(guān)代碼
}else
{
setNetwork();
}] |
這篇文章中已經(jīng)介紹了網(wǎng)絡(luò)狀態(tài)的判斷，但是測(cè)試后發(fā)現(xiàn)用此方法只能夠判斷WIFI是否連接，而現(xiàn)在的智能機(jī)可以是wifi、3G、甚至2G。那么如果用上面的方法就不行了需要進(jìn)行一下修改，使其在網(wǎng)絡(luò)不連接（無論wifi、3G、2G）的時(shí)候也可以判斷。代碼如下
代碼如下 |
復(fù)制代碼 |
//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等網(wǎng)絡(luò)狀態(tài)是連接的，則退出，否則顯示提示信息進(jìn)入網(wǎng)絡(luò)設(shè)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) {
// 如果沒有網(wǎng)絡(luò)連接，則進(jìn)入網(wǎng)絡(luò)設(shè)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();
}
|
種方式更加簡(jiǎn)單，也更加有用，當(dāng)然第一篇也有可取之處，可以加入3G狀態(tài)檢查即可
注意：別忘了加上權(quán)限
代碼如下 |
復(fù)制代碼 |
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission> |
該文章在 2013/2/25 12:58:14 編輯過
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