Java 如何检查ViewGroup片段中的网络连接？

因此，我只是想检查我的网络连接，并执行执行，如果它是真的或假。我知道在一个片段中，您可以在获取系统服务之前使用getactivity，但是这对我不起作用？谢谢你的帮助：）

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在ViewGroup内部，可以使用getContext（）方法获取系统服务

ConnectivityManager connectivityManager =(ConnectivityManager)getContext().getSystemService(Context.CONNECTIVITY_SERVICE);

您可以在自定义视图/视图组的所有构造函数中添加init（）函数，如下所示：

public class CustomView extends Button {
    public CustomView(Context context) {
        super(context);

        init();
    }

    public CustomView(Context context, AttributeSet attrs) {
        super(context, attrs);

        init();
    }

    public CustomView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        init();
    }

    public CustomView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);

        init();
    }

    private void init() {
        ConnectivityManager connectivityManager = (ConnectivityManager) getContext().getSystemService(Context.CONNECTIVITY_SERVICE);
        // Other stuffs
    }
}

public class AppUtil{
public static boolean isNetworkConnectionAvailable(Context ctx, boolean showDialog){
        ConnectivityManager manager =(ConnectivityManager)ctx.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetwork = manager.getActiveNetworkInfo();

        boolean isConnected = activeNetwork != null && activeNetwork.isConnectedOrConnecting();
        if(!isConnected&&showDialog){
            AppUtil.showSimpleDialog(ctx, ctx.getString(R.string.network_not_available),
                    ctx.getString(R.string.internet_not_available));
        }
        return isConnected;
    }

}

public class Fragment1 extends Fragment implements View.OnClickListener {

TextView textView;

if (AppUtil.isNetworkConnectionAvailable(this, true)){
 textView.setVisibility(View.INVISIBLE);
}
else{
 Byron.setEnabled(false);
            Lennox.setEnabled(false);
            Skenners.setEnabled(false);
            Ballina.setEnabled(false);
}


}

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在项目AppUtil中创建一个单独的类，如下所示：

public class CustomView extends Button {
    public CustomView(Context context) {
        super(context);

        init();
    }

    public CustomView(Context context, AttributeSet attrs) {
        super(context, attrs);

        init();
    }

    public CustomView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        init();
    }

    public CustomView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);

        init();
    }

    private void init() {
        ConnectivityManager connectivityManager = (ConnectivityManager) getContext().getSystemService(Context.CONNECTIVITY_SERVICE);
        // Other stuffs
    }
}

public class AppUtil{
public static boolean isNetworkConnectionAvailable(Context ctx, boolean showDialog){
        ConnectivityManager manager =(ConnectivityManager)ctx.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetwork = manager.getActiveNetworkInfo();

        boolean isConnected = activeNetwork != null && activeNetwork.isConnectedOrConnecting();
        if(!isConnected&&showDialog){
            AppUtil.showSimpleDialog(ctx, ctx.getString(R.string.network_not_available),
                    ctx.getString(R.string.internet_not_available));
        }
        return isConnected;
    }

}

public class Fragment1 extends Fragment implements View.OnClickListener {

TextView textView;

if (AppUtil.isNetworkConnectionAvailable(this, true)){
 textView.setVisibility(View.INVISIBLE);
}
else{
 Byron.setEnabled(false);
            Lennox.setEnabled(false);
            Skenners.setEnabled(false);
            Ballina.setEnabled(false);
}


}

要检查网络连接，请执行以下操作：

public class CustomView extends Button {
    public CustomView(Context context) {
        super(context);

        init();
    }

    public CustomView(Context context, AttributeSet attrs) {
        super(context, attrs);

        init();
    }

    public CustomView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        init();
    }

    public CustomView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);

        init();
    }

    private void init() {
        ConnectivityManager connectivityManager = (ConnectivityManager) getContext().getSystemService(Context.CONNECTIVITY_SERVICE);
        // Other stuffs
    }
}

public class AppUtil{
public static boolean isNetworkConnectionAvailable(Context ctx, boolean showDialog){
        ConnectivityManager manager =(ConnectivityManager)ctx.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetwork = manager.getActiveNetworkInfo();

        boolean isConnected = activeNetwork != null && activeNetwork.isConnectedOrConnecting();
        if(!isConnected&&showDialog){
            AppUtil.showSimpleDialog(ctx, ctx.getString(R.string.network_not_available),
                    ctx.getString(R.string.internet_not_available));
        }
        return isConnected;
    }

}

public class Fragment1 extends Fragment implements View.OnClickListener {

TextView textView;

if (AppUtil.isNetworkConnectionAvailable(this, true)){
 textView.setVisibility(View.INVISIBLE);
}
else{
 Byron.setEnabled(false);
            Lennox.setEnabled(false);
            Skenners.setEnabled(false);
            Ballina.setEnabled(false);
}


}