java - 在 fragment 中单击按钮时 SetOnClickListener 不起作用

Question

我在 Activity 内的 fragment 内有一个按钮。该 fragment 包含 Edittext 供用户输入，然后按下按钮并处理一些操作。当我单击该按钮时，我什至在 logcat 选项卡上看不到 Log.v 输出。这意味着 android 没有检测到 onClickListener 事件。我想知道是否是因为该事件需要在 Activity 线程中发生，而 fragment 在另一个线程中工作。如果有人可以澄清如何让它发挥作用？

Activity

public class TracerouteActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_traceroute);
        Toolbar toolbar = findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
    }
}

fragment

package org.pctechtips.netdroid.traceroute;

import android.app.ProgressDialog;
import android.content.Context;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;

import static android.content.ContentValues.TAG;

public class TraceRouteFragment extends Fragment {

    public static final String tag = "TraceroutePing";
    public static final String INTENT_TRACE = "INTENT_TRACE";


    private Button buttonLaunch;
    private EditText editTextPing;
    private ProgressBar progressBarPing;
    private ListView listViewTraceroute;
    private TraceListAdapter traceListAdapter;
    protected ProgressDialog scanProgressDialog;

    private TracerouteWithPing tracerouteWithPing;
    private final int maxTtl = 40;

    private List<TracerouteContainer> traces;

    /**
     * onCreate, init main components from view
     */
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.traceroute, container, false);

        this.tracerouteWithPing = new TracerouteWithPing(this);
        this.traces = new ArrayList<TracerouteContainer>();


        this.buttonLaunch = (Button) view.findViewById(R.id.buttonLaunch);
        this.editTextPing = (EditText) view.findViewById(R.id.editTextPing);
        this.listViewTraceroute = (ListView) view.findViewById(R.id.listViewTraceroute);
        this.progressBarPing = (ProgressBar) view.findViewById(R.id.progressBarPing);

        traceListAdapter = new TraceListAdapter(getContext());
        listViewTraceroute.setAdapter(traceListAdapter);

        buttonLaunch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (editTextPing.getText().length() == 0) {
                    Toast.makeText(getContext(), getString(R.string.no_text_trace), Toast.LENGTH_SHORT).show();
                } else {
                    traces.clear();
                    traceListAdapter.notifyDataSetChanged();

                    startProgressBar();
                    hideSoftwareKeyboard(editTextPing);
                    tracerouteWithPing.executeTraceroute(editTextPing.getText().toString(), maxTtl);
                }
                Log.v(tag, "traceroute to " + editTextPing.getText().toString());
            }
        });

        return view;
    }

    /**
     * initView, init the main view components (action, adapter...)
     */
    private void initView() {


    }

    /**
     * Allows to refresh the listview of traces
     */
    /*public void refreshList(TracerouteContainer trace) {
        final TracerouteContainer fTrace = trace;
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                traces.add(fTrace);
                traceListAdapter.notifyDataSetChanged();
            }
        });
    }*/


    /**
     * The adapter of the listview (build the views)
     */
    public class TraceListAdapter extends BaseAdapter {

        private Context context;

        public TraceListAdapter(Context c) {
            context = c;
        }

        public int getCount() {
            return traces.size();
        }

        public TracerouteContainer getItem(int position) {
            return traces.get(position);
        }

        public long getItemId(int position) {
            return position;
        }

        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder;

            // first init
            if (convertView == null) {
                LayoutInflater vi = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                convertView = vi.inflate(R.layout.item_list_trace, null);

                TextView textViewNumber = (TextView) convertView.findViewById(R.id.textViewNumber);
                TextView textViewIp = (TextView) convertView.findViewById(R.id.textViewIp);
                TextView textViewTime = (TextView) convertView.findViewById(R.id.textViewTime);
                ImageView imageViewStatusPing = (ImageView) convertView.findViewById(R.id.imageViewStatusPing);

                // Set up the ViewHolder.
                holder = new ViewHolder();
                holder.textViewNumber = textViewNumber;
                holder.textViewIp = textViewIp;
                holder.textViewTime = textViewTime;
                holder.imageViewStatusPing = imageViewStatusPing;

                // Store the holder with the view.
                convertView.setTag(holder);
            } else {
                holder = (ViewHolder) convertView.getTag();
            }

            TracerouteContainer currentTrace = getItem(position);

            if (position % 2 == 1) {
                convertView.setBackgroundResource(R.drawable.table_odd_lines);
            } else {
                convertView.setBackgroundResource(R.drawable.table_pair_lines);
            }

            if (currentTrace.isSuccessful()) {
                holder.imageViewStatusPing.setImageResource(R.drawable.ic_check_green_24dp);
            } else {
                holder.imageViewStatusPing.setImageResource(R.drawable.ic_close_red_24dp);
            }

            holder.textViewNumber.setText(position + "");
            holder.textViewIp.setText(currentTrace.getHostname() + " (" + currentTrace.getIp() + ")");
            holder.textViewTime.setText(currentTrace.getMs() + "ms");

            return convertView;
        }

        // ViewHolder pattern
        class ViewHolder {
            TextView textViewNumber;
            TextView textViewIp;
            TextView textViewTime;
            ImageView imageViewStatusPing;
        }
    }

    /**
     * Hides the keyboard
     *
     * @param currentEditText The current selected edittext
     */
    public void hideSoftwareKeyboard(EditText currentEditText) {
        InputMethodManager imm = (InputMethodManager) getActivity().getSystemService(Context.INPUT_METHOD_SERVICE);
        if (imm.isActive()) {
            imm.hideSoftInputFromWindow(currentEditText.getWindowToken(), InputMethodManager.HIDE_NOT_ALWAYS);
        }
    }

    public void startProgressBar() {
        progressBarPing.setVisibility(View.VISIBLE);
        getActivity().getWindow().setFlags(WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,
                WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE);
        scanProgressDialog = new ProgressDialog(getContext(), R.style.NewDialog);
        scanProgressDialog.setCancelable(false);
        scanProgressDialog.getWindow().setGravity(Gravity.CENTER);

        scanProgressDialog.setTitle("Tracing.... Please wait");
        scanProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
        scanProgressDialog.show();


    }

    public void stopProgressBar() {
//        progressBarPing.setVisibility(View.GONE);
//        getActivity().getWindow().clearFlags(WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE);
        scanProgressDialog.dismiss();


    }


    @Override
    public void onPause() {
        super.onPause();

    }


}

Answer 1

在您的buttonLaunch.setOnClickListener()方法参数中，您使用了“new View.onClickListener(){}”，您必须将其更改为“new OnClickListener(){}”，其中的其他所有内容都将相同。

查看这篇文章了解更多信息:

Android Fragment onClick button Method