Android 判断是否连接网络，判断网络连接方式

如何判断Android是否连接网络？

Java代码：

ConnectivityManager conn = (ConnectivityManager) getSystemService(Activity.CONNECTIVITY_SERVICE);
boolean wifi = conn.getNetworkInfo(ConnectivityManager.TYPE_WIFI).isConnectedOrConnecting();
boolean internet = conn.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).isConnectedOrConnecting();
if (wifi | internet) {
Toast.makeText(getApplicationContext(), "网络已连接", Toast.LENGTH_LONG).show();
} else {
Toast.makeText(getApplicationContext(), "未连接网络。", Toast.LENGTH_LONG).show();
}

AndroidManifest.xml添加权限：

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

================我是分割线====================

Android判断设备网络连接状态，并判断连接方式

如何判断Android设备网络连接状态，并判断连接方式？

--调用checkNetworkState方法--

ConnectivityManager manager;
/*检测网络是否连接*/
private boolean checkNetworkState() {
boolean flag = false;
//得到网络连接信息
manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
//去进行判断网络是否连接
if (manager.getActiveNetworkInfo() != null) {
flag = manager.getActiveNetworkInfo().isAvailable();
}
if (!flag) {
setNetwork();//设置网络
} else {
isNetworkAvailable();//判断连接方式
}
return flag;
}

/* 网络已连接，判断连接方式 */
private void isNetworkAvailable() {
State gprs = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE).getState();
State wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI).getState();
if (gprs == State.CONNECTED || gprs == State.CONNECTING) {
Toast.makeText(this, "网络已连接！连接方式：gprs", Toast.LENGTH_SHORT).show();
}
if (wifi == State.CONNECTED || wifi == State.CONNECTING) {
Toast.makeText(this, "网络已连接！连接方式：wifi", Toast.LENGTH_SHORT).show();
// do something: wifi状态下才能做某事
}
}

/* 网络未连接，调用设置方法 */
private void setNetwork() {
Toast.makeText(this, "网络未连接。", Toast.LENGTH_SHORT).show();
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setIcon(R.drawable.ic_launcher);
builder.setTitle("网络提示信息");
builder.setMessage("网络不可用，如果继续，请先设置网络！");
builder.setPositiveButton("设置", new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {
Intent intent = null;
/*
* 判断手机系统，如果API>10 就是3.0+ 3.0以上和3.0以上设置不一样， 调用的方法不一样
*/
if (android.os.Build.VERSION.SDK_INT > 10) {
intent = new Intent(android.provider.Settings.ACTION_WIFI_SETTINGS);
} else {
intent = new Intent();
ComponentName component = new ComponentName("com.android.settings",
"com.android.settings.WirelessSettings");
intent.setComponent(component);
intent.setAction("android.intent.action.VIEW");
}
startActivity(intent);
}
});

builder.setNegativeButton("取消", new OnClickListener() {

@Override
public void onClick(DialogInterface dialog, int which) {

}
});

builder.create();
builder.show();

}