public class Main extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } public void click(View view) { if(isConn()){ Toast.makeText(this, "网络可用", 0).show(); }else{ Toast.makeText(this, "网络不可用", 0).show(); setNetworkMethod(); } } private boolean isConn() { boolean flag = false; ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo network = cm.getActiveNetworkInfo(); if (network != null) { flag = network.isAvailable(); } return flag; } private void setNetworkMethod(){ AlertDialog.Builder builder = new Builder(this); builder.setTitle("网络设置提示"); builder.setMessage("网络连接不可用,是否进行设置?"); builder.setPositiveButton("设置", new DialogInterface.OnClickListener(){ @Override public void onClick(DialogInterface dialog, int which) { Intent intent = null; //判断手机系统的版本 即API大于10 就是3.0或以上版本 if(android.os.Build.VERSION.SDK_INT>10){ intent = new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS); }else{ intent = new Intent(); intent.setClassName("com.android.settings","com.android.settings.WirelessSettings"); } startActivity(intent); } }).setNegativeButton("取消", new DialogInterface.OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { dialog.dismiss(); } }); builder.show(); } }
需要添加一个权限:android.permission.ACCESS_NETWORK_STATE
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