Android-网络监听

布满荆棘的人生 2022-02-22 15:40 336阅读 0赞

直接在BaseActivity中引下面代码：

private ConnectivityManager.NetworkCallback networkCallback;
    private ConnectivityManager connectivityManager;
    
    
    
    //网络监听
    networkCallback = new NetworkCallbackImpl();
    NetworkRequest.Builder builder = new NetworkRequest.Builder();
    NetworkRequest request = builder.build();
    connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    connectivityManager.registerNetworkCallback(request, networkCallback);
    
    
    
    private class NetworkCallbackImpl extends ConnectivityManager.NetworkCallback {
    
            /**
             * 网络可用的回调连接成功
             */
            @Override
            public void onAvailable(Network network) {
                super.onAvailable(network);
                mHandler.post(new Runnable() {
                    @Override
                    public void run() {
                        if (mNetErrorView != null) {
                            mNetErrorView.setVisibility(View.GONE);
                        }
                    }
                });
            }
    
            /**
             * 实践中在网络连接正常的情况下，丢失数据会有回调
             */
            @Override
            public void onLosing(Network network, int maxMsToLive) {
                super.onLosing(network, maxMsToLive);
            }
    
            /**
             * 网络不可用时调用和onAvailable成对出现
             */
            @Override
            public void onLost(Network network) {
                super.onLost(network);
                mHandler.post(new Runnable() {
                    @Override
                    public void run() {
                        if (mNetErrorView != null) {
                            mNetErrorView.setVisibility(View.VISIBLE);
                        }
                    }
                });
            }
    
        }

mNetErrorView 是无网络时显示的一个view，写一个这个view的布局net\_status\_bar.xml

<?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@+id/net_status_bar_top"
        android:layout_width="match_parent"
        android:layout_height="@dimen/net_height"
        android:background="@drawable/net_warning_bar_bg"
        android:clickable="true"
        android:gravity="center_vertical"
        android:paddingLeft="@dimen/padding_normal"
        android:visibility="gone" >
    
        <TextView
            android:id="@+id/net_status_bar_info_top"
            android:layout_width="0.0dip"
            android:layout_height="match_parent"
            android:layout_gravity="center_vertical"
            android:layout_marginRight="@dimen/margin_normal"
            android:layout_weight="1.0"
            android:drawableLeft="@drawable/net_warning"
            android:drawablePadding="@dimen/padding_normal"
            android:gravity="center_vertical"
            android:text="@string/net_state_info"
            android:textColor="@color/black"
            android:textSize="@dimen/font_size_normal" />
    
        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginRight="@dimen/margin_normal"
            android:contentDescription="@string/app_name"
            android:src="@drawable/net_warning_redirect"
            android:visibility="gone" />
    
    </LinearLayout>

再在需要用到网络监听的Activity中继承BaseActivity，再在当前Activity中

mNetErrorView = findViewById(R.id.net_status_bar_top);

最后在当前Activity的布局中适当的位置引入这个布局文件即可

到此就完成了实时网络监听

如果需要已进入就监听到网络，需要在BaseActivity的onResume中监听

if (!NetUtil.isNetConnected(this)) {
                if (mNetErrorView != null) {
                    mNetErrorView.setVisibility(View.VISIBLE);
                }
            } else {
                if (mNetErrorView != null) {
                    mNetErrorView.setVisibility(View.GONE);
                }
            }

监听代码

public static boolean isNetConnected(Context context) {
            boolean isNetConnected;
            // 获得网络连接服务
            ConnectivityManager connManager = (ConnectivityManager) context
                    .getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo info = connManager.getActiveNetworkInfo();
            if (info != null && info.isAvailable()) {
    //			String name = info.getTypeName();
                isNetConnected = true;
            } else {
                isNetConnected = false;
            }
            return isNetConnected;
        }

再在onDestroy中取消注册

connectivityManager.unregisterNetworkCallback(networkCallback);

上面代码中所需要的一些尺寸，图片等可以自行先随意设置，先看效果，后期可换成项目所需的对应资源

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