Android(安卓)Activity生命周期应用 网络设置
16lz
2021-01-26
布局文件未动
package com.pas.checknetwork;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.os.Bundle;import android.app.Activity;import android.app.AlertDialog;import android.app.AlertDialog.Builder;import android.content.DialogInterface;import android.content.DialogInterface.OnClickListener;import android.content.Intent;import android.view.Menu;import android.widget.Toast;public class MainActivity extends Activity{@Overrideprotected void onCreate(Bundle savedInstanceState){super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}@Overridepublic boolean onCreateOptionsMenu(Menu menu){// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overrideprotected void onStart(){//1、创建对话框构造器checkNetState();super.onStart();}private void checkNetState(){ConnectivityManager connmanager = (ConnectivityManager) this.getSystemService(CONNECTIVITY_SERVICE);NetworkInfo netinfo = connmanager.getActiveNetworkInfo();if (netinfo != null && netinfo.isConnected()){Toast.makeText(this, "网络可用", Toast.LENGTH_LONG).show();} else{AlertDialog.Builder builder=new Builder(this);builder.setTitle("提醒");builder.setMessage("当前网络不可用，点击确定设置网络");builder.setPositiveButton("取消",new OnClickListener(){@Overridepublic void onClick(DialogInterface dialog, int which){finish();}});builder.setNegativeButton("确定", new OnClickListener(){@Overridepublic void onClick(DialogInterface dialog, int which){Toast.makeText(MainActivity.this, "网络不可用，请设置", Toast.LENGTH_LONG).show();Intent intent = new Intent();intent.setClassName("com.android.settings", "com.android.settings.SettingsEMUI");startActivity(intent);}});builder.create().show();}}}
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