10分钟让你实现在APP中对网络状态变化进行全局提示

public class NetworkConnectChangedReceiver extends BroadcastReceiver {
    private static final String TAG = "NetworkConnectChanged";
    @Override
    public void onReceive(Context context, Intent intent) {
        //**判断当前的网络连接状态是否可用*/
        boolean isConnected = NetUtils.isConnected(context);
        Log.d(TAG, "onReceive: 当前网络 " + isConnected);
        EventBus.getDefault().post(new NetworkChangeEvent(isConnected));
    }
}

public class NetworkChangeEvent {
    public boolean isConnected; //是否存在网络

    public NetworkChangeEvent(boolean isConnected) {
        this.isConnected = isConnected;
    }
}

/**
 * 判断网络是否连接
 * @param context
 * @return
 */
public static boolean isConnected(Context context) {
    ConnectivityManager connectivity = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);

    if (null != connectivity) {
        NetworkInfo info = connectivity.getActiveNetworkInfo();
        if (null != info && info.isConnected()) {
            if (info.getState() == NetworkInfo.State.CONNECTED) {
                return true;
            }
        }
    }
    return false;
}

<receiver android:name=".receiver.NetworkConnectChangedReceiver">
    <intent-filter>
        <action android:name="android.NET.conn.CONNECTIVITY_CHANGE" />
        <action android:name="android.Net.wifi.WIFI_STATE_CHANGED" />
        <action android:name="android.net.wifi.STATE_CHANGE" />
    </intent-filter>
</receiver>

public class BaseActivity extends Activity {

    protected Context mContext;
    protected ACache mACache;
    protected boolean mCheckNetWork = true; //默认检查网络状态
    View mTipView;
    WindowManager mWindowManager;
    WindowManager.LayoutParams mLayoutParams;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mContext = this;
        this.mACache = ACache.get(mContext);
        MyApp.addActivity(this);
        initTipView();//初始化提示View
        EventBus.getDefault().register(this);
    }

    @Override
    protected void onResume() {
        super.onResume();
        MobclickAgent.onResume(this);
        //在无网络情况下打开APP时，系统不会发送网络状况变更的Intent，需要自己手动检查
        hasNetWork(NetUtils.isConnected(mContext));
    }

    @Override
    protected void onPause() {
        super.onPause();
        MobclickAgent.onPause(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        MyApp.removeActivity(this);
        EventBus.getDefault().unregister(this);
    }

    @Override
    public void finish() {
        super.finish();
        //当提示View被动态添加后直接关闭页面会导致该View内存溢出，所以需要在finish时移除
        if (mTipView != null && mTipView.getParent() != null) {
            mWindowManager.removeView(mTipView);
        }
    }

    @Subscribe(threadMode = ThreadMode.MAIN)
    public void onNetworkChangeEvent(NetworkChangeEvent event) {
        hasNetWork(event.isConnected);
    }

    private void hasNetWork(boolean has) {
        if (isCheckNetWork()) {
            if (has) {
                if (mTipView != null && mTipView.getParent() != null) {
                    mWindowManager.removeView(mTipView);
                }
            } else {
                if (mTipView.getParent() == null) {
                    mWindowManager.addView(mTipView, mLayoutParams);
                }
            }
        }
    }

    public void setCheckNetWork(boolean checkNetWork) {
        mCheckNetWork = checkNetWork;
    }

    public boolean isCheckNetWork() {
        return mCheckNetWork;
    }

    private void initTipView() {
        LayoutInflater inflater = getLayoutInflater();
        mTipView = inflater.inflate(R.layout.layout_network_tip, null); //提示View布局
        mWindowManager = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
        mLayoutParams = new WindowManager.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT,
                WindowManager.LayoutParams.TYPE_APPLICATION,
                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                        | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,
                PixelFormat.TRANSLUCENT);
        //使用非CENTER时，可以通过设置XY的值来改变View的位置
        mLayoutParams.gravity = Gravity.TOP;
        mLayoutParams.x = 0;
        mLayoutParams.y = 0;
    }
}