Android-----------判断是否有网络连接并手动开启网络

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public class MainActivity extends AppCompatActivity implements View.OnClickListener{    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main); if(isNetworkAvailable(this)){      //有网的情况      Toast.makeText(MainActivity.this,"网络可用",Toast.LENGTH_SHORT).show(); }else{      //没网的情况，提示去手动开启网络      Toast.makeText(MainActivity.this,"网络不可用",Toast.LENGTH_SHORT).show();      AlertDialog.Builder builder=new AlertDialog.Builder(this)              .setTitle("提示")              .setMessage("当前网络不可用，是否去设置网络")              .setPositiveButton("确定", new DialogInterface.OnClickListener() {                  @Override                  public void onClick(DialogInterface dialog, int which) {                      Intent intent=new Intent("android.settings.WIFI_SETTINGS");                      startActivity(intent);                  }              })             .setNegativeButton("取消", new DialogInterface.OnClickListener() {                 @Override                 public void onClick(DialogInterface dialog, int which) {                     dialog.dismiss();                     finish();                 }             });      builder.create().show();  }    }    @Override    public void onClick(View v) {    }    //判断网络是否连接的方法    public static boolean isNetworkAvailable(Context context) {        ConnectivityManager connectivity = (ConnectivityManager) context                .getSystemService(Context.CONNECTIVITY_SERVICE);        if (connectivity != null) {            NetworkInfo info = connectivity.getActiveNetworkInfo();            if (info != null && info.isConnected())            {                // 当前网络是连接的                if (info.getState() == NetworkInfo.State.CONNECTED)                {                    // 当前所连接的网络可用                    return true;                }            }        }        return false;    }}注意：别忘了加权限     <uses-permission android:name="android.permission.INTERNET"></uses-permission>    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
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