[置顶] Android基础--ConnectivityManager检查网络连接

PrimaryActivity.java

import android.content.Context;import android.net.ConnectivityManager;import android.net.NetworkInfo;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.support.v7.widget.Toolbar;import android.util.Log;import android.util.TypedValue;import android.view.Menu;import android.view.MenuItem;/** * Created by JKerving on 2015/11/25. */public class PrimaryActivity extends AppCompatActivity {    public static final String TAG = "Basic Network Demo";    private static boolean wifiConnected = false;    private static boolean mobileConnected = false;    @Override    public void onCreate(Bundle savedInstanceState){        super.onCreate(savedInstanceState);        setContentView(R.layout.primary_layout);        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);//这里使用toolbar，放弃使用actionbar        setSupportActionBar(toolbar);        SimpleTextFragment fragment = (SimpleTextFragment)      getFragmentManager().findFragmentById(R.id.intro_fragment);//界面显示使用Fragment，使得我们的UI更易管理，自从Fragment问世以来我们就应当更加频繁的使用Fragment        fragment.setText(R.string.intro_message);        fragment.getTextView().setTextSize(TypedValue.COMPLEX_UNIT_DIP,16.0f);    }    @Override    public boolean onCreateOptionsMenu(Menu menu){        getMenuInflater().inflate(R.menu.menu_main,menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item){        switch (item.getItemId()){            case R.id.test_action:                checkNetworkConnection();                return true;            case R.id.clear_action:                return true;        }        return false;    }    private void checkNetworkConnection() {        ConnectivityManager connMgr = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo activeInfo = connMgr.getActiveNetworkInfo();        if (activeInfo != null && activeInfo.isConnected()){            wifiConnected = activeInfo.getType() == ConnectivityManager.TYPE_WIFI;            mobileConnected = activeInfo.getType() == ConnectivityManager.TYPE_MOBILE;            if (wifiConnected){                Log.i(TAG,getString(R.string.wifi_connection));            }else if (mobileConnected){                Log.i(TAG,getString(R.string.mobile_connection));            }        }else {            Log.i(TAG,getString(R.string.no_wifi_or_mobile));        }    }}

SimpleTextFragment.java

import android.app.Fragment;import android.os.Bundle;import android.util.Log;import android.view.Gravity;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.TextView;import android.widget.Toast;/** * Created by JKerving on 2015/11/25. */public class SimpleTextFragment extends Fragment {    String mText;    int mTextId = -1;    public static final String TEXT_KEY = "text";    public static final String TEXT_ID_KEY = "text_id";    private TextView mTextView;    public SimpleTextFragment(){}    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){        //Initialize the variables by using getArguments in Fragment        //Fragment中的变量我们应当尽可能的使用setArgument与getArgument方法来进行初始化        if (getArguments() != null){            Bundle args = getArguments();            if (args.containsKey(TEXT_KEY)){                mText = args.getString(TEXT_KEY);                Log.d("Constructors","Initialize Text");            }else if (args.containsKey(TEXT_ID_KEY)){                mTextId = args.getInt(TEXT_ID_KEY);                mText = getString(mTextId);                Log.d("Constructors","Initialize TextID and Text");            }        }else {            Toast.makeText(getActivity(),"getAruments is null",Toast.LENGTH_SHORT).show();        }        mTextView = new TextView(getActivity());        mTextView.setGravity(Gravity.CENTER);        if (mText != null){            mTextView.setText(mText);        }        return mTextView;    }    public TextView getTextView(){        return mTextView;    }    public void setText(int stringId){        getTextView().setText(getActivity().getString(stringId));    }}

布局文件
primary_layout.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="match_parent">    <android.support.v7.widget.Toolbar android:id="@+id/toolbar" android:layout_width="match_parent" android:layout_height="?attr/actionBarSize" android:background="?attr/colorPrimary" app:popupTheme="@style/AppTheme.PopupOverlay" />    <fragment  android:name="com.example.jkerving.basicnetwork.SimpleTextFragment" android:id="@+id/intro_fragment" android:layout_weight="1" android:layout_width="match_parent" android:layout_height="match_parent"/>    <View  android:layout_width="match_parent" android:layout_height="1dp" android:background="@android:color/darker_gray"/></LinearLayout>

在写这个程序的过程中，遇到了一些小问题。
Error：

java.lang.SecurityException: ConnectivityService: Neither user 10063 nor current process has android.permission.ACCESS_NETWORK_STATE.

观察错误发现是由于没有在AndroidManifest.xml中声明取得网络状态的权限，只要加上以下权限即可正常运行：

uses-permission android:name=”android.permission.ACCESS_NETWORK_STATE”

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