eclipse 如何在片段中实现按钮 SetOnClickListener？

How to implement button SetOnClickListener in a fragment?

提问by Arya

I'm working on a small project and I want to use a Slider Menu. Long story short I happen to find a source code of a slider menu using drawer from some website and it works very well on my device. However I'm a little bit confused migrating my previous activity into this slider menu because they use fragment for each individual item on the listView.

我正在做一个小项目，我想使用滑块菜单。长话短说，我碰巧从某个网站上找到了使用抽屉的滑块菜单的源代码，它在我的设备上运行良好。但是，将我以前的活动迁移到此滑块菜单时我有点困惑，因为它们对 listView 上的每个单独项目使用片段。

To simple things up I want to migrate an activity that capable of do a Ping function. it's xml file consist of one EditText, a Button, and a TextView for showing the output.

为了简单起见，我想迁移一个能够执行 Ping 功能的活动。它的 xml 文件由一个 EditText、一个 Button 和一个用于显示输出的 TextView 组成。

Now I did manage to "successfully" migrating that activity into this fragment. The drawer runs well, but I got stuck because the app always force close after I click on the ping button.

现在我确实设法“成功”地将该活动迁移到此片段中。抽屉运行良好，但我卡住了，因为应用程序总是在我点击 ping 按钮后强制关闭。

PS: I haven't change the class name yet, pardon me

PS：我还没有更改班级名称，请见谅

Below are my code:

下面是我的代码：

this is my original Ping activity:

这是我原来的 Ping 活动：

package my.jlm;

import java.io.IOException;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.InetAddress;
import java.net.UnknownHostException;

import android.app.Activity;
import android.os.Bundle;
import android.text.Editable;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


public class Ping extends Activity {
    EditText edit;
    TextView text;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_ping);
    edit = (EditText)findViewById(R.id.editText1);
    edit.setText("192.168.1.1");
    text = (TextView)findViewById(R.id.textView1);
    Button button = (Button)findViewById(R.id.button1);
    button.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
    // TODO Auto-generated method stub

    Editable host = edit.getText();
    try {
    String pingCmd = "ping -c 5 " + host;
    String pingResult = "";
    Runtime r = Runtime.getRuntime();
    Process p = r.exec(pingCmd);
    BufferedReader in = new BufferedReader(new
    InputStreamReader(p.getInputStream()));
    String inputLine;
    while ((inputLine = in.readLine()) != null) {
    System.out.println(inputLine);
    text.setText(inputLine + "\n\n");
    pingResult += inputLine;
    text.setText(pingResult);
    }
    in.close();
    }//try
    catch (IOException e) {
    System.out.println(e);
    }


    }
    });
    }}

this FindPeopleFragment.java (this should be the PingFragment.java). I thought this was a successful attempt because eclipse didn't show any red mark, but if Im wrong please correct me.

这个 FindPeopleFragment.java（这应该是 PingFragment.java）。我认为这是一次成功的尝试，因为 eclipse 没有显示任何红色标记，但是如果我错了，请纠正我。

package info.androidhive.slidingmenu;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import android.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


public class FindPeopleFragment extends Fragment 
        implements OnClickListener
{
        EditText edit;
        TextView text;
        Button button;





    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

        View rootView = inflater.inflate(R.layout.activity_ping, container, false);


        EditText edit = (EditText) rootView.findViewById(R.id.editText1);
        edit.setText("192.168.1.1");
        text = (TextView) rootView.findViewById(R.id.textView1);
        button = (Button)rootView.findViewById(R.id.button1);
        button.setOnClickListener(onClickListener);





        return rootView;
    }

    @Override
    public void onClick(View v) {
        Editable host = edit.getText();
        try {
        String pingCmd = "ping -c 5 " + host;
        String pingResult = "";
        Runtime r = Runtime.getRuntime();
        Process p = r.exec(pingCmd);
        BufferedReader in = new BufferedReader(new
        InputStreamReader(p.getInputStream()));
        String inputLine;
        while ((inputLine = in.readLine()) != null) {
        System.out.println(inputLine);
        text.setText(inputLine + "\n\n");
        pingResult += inputLine;
        text.setText(pingResult);
        }
        in.close();
        }//try
        catch (IOException e) {
        System.out.println(e);
        }

    }

};;

and finally this is my Manifest for above project

最后这是我对上述项目的清单

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="info.androidhive.slidingmenu"
    android:versionCode="1"
    android:versionName="1.0" >

    <permission
        android:name="my.jlm.permission.MAPS_RECEIVE"
        android:protectionLevel="signature"/>

    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
    <uses-permission android:name="museumjakarta.source.permission.MAPS_RECEIVE"/>    
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
    <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>


      <uses-permission android:name="android.permission.CALL_PHONE" />
      <uses-permission android:name="android.permission.READ_PHONE_STATE" />

    <uses-sdk
        android:minSdkVersion="11"
        android:targetSdkVersion="17" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="info.androidhive.slidingmenu.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>




    </application>

</manifest>

and this is my LogCat error log:

这是我的 LogCat 错误日志：

03-15 09:07:41.160: E/AndroidRuntime(1267): FATAL EXCEPTION: main
03-15 09:07:41.160: E/AndroidRuntime(1267): Process: info.androidhive.slidingmenu, PID: 1267
03-15 09:07:41.160: E/AndroidRuntime(1267): java.lang.NullPointerException
03-15 09:07:41.160: E/AndroidRuntime(1267):     at info.androidhive.slidingmenu.FindPeopleFragment.onClick(FindPeopleFragment.java:53)
03-15 09:07:41.160: E/AndroidRuntime(1267):     at android.view.View.performClick(View.java:4424)
03-15 09:07:41.160: E/AndroidRuntime(1267):     at android.view.View$PerformClick.run(View.java:18383)
03-15 09:07:41.160: E/AndroidRuntime(1267):     at android.os.Handler.handleCallback(Handler.java:733)
03-15 09:07:41.160: E/AndroidRuntime(1267):     at android.os.Handler.dispatchMessage(Handler.java:95)
03-15 09:07:41.160: E/AndroidRuntime(1267):     at android.os.Looper.loop(Looper.java:137)
03-15 09:07:41.160: E/AndroidRuntime(1267):     at android.app.ActivityThread.main(ActivityThread.java:4998)
03-15 09:07:41.160: E/AndroidRuntime(1267):     at java.lang.reflect.Method.invokeNative(Native Method)
03-15 09:07:41.160: E/AndroidRuntime(1267):     at java.lang.reflect.Method.invoke(Method.java:515)
03-15 09:07:41.160: E/AndroidRuntime(1267):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
03-15 09:07:41.160: E/AndroidRuntime(1267):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
03-15 09:07:41.160: E/AndroidRuntime(1267):     at dalvik.system.NativeStart.main(Native Method)

to simplify here is what I experienced: the Ping xml page shows up after I click from the Drawer ListView, however when I click the Ping Button inside it, the application crashed, resulting the above error log. Help me resolve this problem and thank you very much.

为了简化这里是我所经历的：Ping xml 页面在我从 Drawer ListView 单击后显示，但是当我单击其中的 Ping 按钮时，应用程序崩溃，导致上述错误日志。帮我解决这个问题，非常感谢。

PS: I'm using eclipse adt because I can't run AS on my AMD processor.

PS：我使用 eclipse adt 因为我不能在我的 AMD 处理器上运行 AS。

edit: thought it may help, i will post the mainActivity.java for this fragment:

编辑：认为它可能会有所帮助，我将发布此片段的 mainActivity.java：

package info.androidhive.slidingmenu;

import info.androidhive.slidingmenu.adapter.NavDrawerListAdapter;
import info.androidhive.slidingmenu.model.NavDrawerItem;

import java.util.ArrayList;

import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.content.res.Configuration;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.v4.app.ActionBarDrawerToggle;
import android.support.v4.widget.DrawerLayout;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;

public class MainActivity extends Activity {
    private DrawerLayout mDrawerLayout;
    private ListView mDrawerList;
    private ActionBarDrawerToggle mDrawerToggle;

    // nav drawer title
    private CharSequence mDrawerTitle;

    // used to store app title
    private CharSequence mTitle;

    // slide menu items
    private String[] navMenuTitles;
    private TypedArray navMenuIcons;

    private ArrayList<NavDrawerItem> navDrawerItems;
    private NavDrawerListAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTitle = mDrawerTitle = getTitle();

        // load slide menu items
        navMenuTitles = getResources().getStringArray(R.array.nav_drawer_items);

        // nav drawer icons from resources
        navMenuIcons = getResources()
                .obtainTypedArray(R.array.nav_drawer_icons);

        mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
        mDrawerList = (ListView) findViewById(R.id.list_slidermenu);

        navDrawerItems = new ArrayList<NavDrawerItem>();

        // adding nav drawer items to array
        // Home
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[0], navMenuIcons.getResourceId(0, -1)));
        // Find People
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[1], navMenuIcons.getResourceId(1, -1)));
        // Photos
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[2], navMenuIcons.getResourceId(2, -1)));
        // Communities, Will add a counter here
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[3], navMenuIcons.getResourceId(3, -1), true, "22"));
        // Pages
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[4], navMenuIcons.getResourceId(4, -1)));
        // What's hot, We  will add a counter here
        navDrawerItems.add(new NavDrawerItem(navMenuTitles[5], navMenuIcons.getResourceId(5, -1), true, "50+"));


        // Recycle the typed array
        navMenuIcons.recycle();

        mDrawerList.setOnItemClickListener(new SlideMenuClickListener());

        // setting the nav drawer list adapter
        adapter = new NavDrawerListAdapter(getApplicationContext(),
                navDrawerItems);
        mDrawerList.setAdapter(adapter);

        // enabling action bar app icon and behaving it as toggle button
        getActionBar().setDisplayHomeAsUpEnabled(true);
        getActionBar().setHomeButtonEnabled(true);

        mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout,
                R.drawable.ic_drawer, //nav menu toggle icon
                R.string.app_name, // nav drawer open - description for accessibility
                R.string.app_name // nav drawer close - description for accessibility
        ) {
            public void onDrawerClosed(View view) {
                getActionBar().setTitle(mTitle);
                // calling onPrepareOptionsMenu() to show action bar icons
                invalidateOptionsMenu();
            }

            public void onDrawerOpened(View drawerView) {
                getActionBar().setTitle(mDrawerTitle);
                // calling onPrepareOptionsMenu() to hide action bar icons
                invalidateOptionsMenu();
            }
        };
        mDrawerLayout.setDrawerListener(mDrawerToggle);

        if (savedInstanceState == null) {
            // on first time display view for first nav item
            displayView(0);
        }
    }

    /**
     * Slide menu item click listener
     * */
    private class SlideMenuClickListener implements
            ListView.OnItemClickListener {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position,
                long id) {
            // display view for selected nav drawer item
            displayView(position);
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // toggle nav drawer on selecting action bar app icon/title
        if (mDrawerToggle.onOptionsItemSelected(item)) {
            return true;
        }
        // Handle action bar actions click
        switch (item.getItemId()) {
        case R.id.action_settings:
            return true;
        default:
            return super.onOptionsItemSelected(item);
        }
    }

    /* *
     * Called when invalidateOptionsMenu() is triggered
     */
    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        // if nav drawer is opened, hide the action items
        boolean drawerOpen = mDrawerLayout.isDrawerOpen(mDrawerList);
        menu.findItem(R.id.action_settings).setVisible(!drawerOpen);
        return super.onPrepareOptionsMenu(menu);
    }

    /**
     * Diplaying fragment view for selected nav drawer list item
     * */
    private void displayView(int position) {
        // update the main content by replacing fragments
        Fragment fragment = null;
        switch (position) {
        case 0:
            fragment = new HomeFragment();
            break;
        case 1:
            fragment = new FindPeopleFragment();
            break;
        case 2:
            fragment = new PhotosFragment();
            break;
        case 3:
            fragment = new CommunityFragment();
            break;
        case 4:
            fragment = new PagesFragment();
            break;
        case 5:
            fragment = new WhatsHotFragment();
            break;

        default:
            break;
        }

        if (fragment != null) {
            FragmentManager fragmentManager = getFragmentManager();
            fragmentManager.beginTransaction()
                    .replace(R.id.frame_container, fragment).commit();

            // update selected item and title, then close the drawer
            mDrawerList.setItemChecked(position, true);
            mDrawerList.setSelection(position);
            setTitle(navMenuTitles[position]);
            mDrawerLayout.closeDrawer(mDrawerList);
        } else {
            // error in creating fragment
            Log.e("MainActivity", "Error in creating fragment");
        }
    }

    @Override
    public void setTitle(CharSequence title) {
        mTitle = title;
        getActionBar().setTitle(mTitle);
    }

    /**
     * When using the ActionBarDrawerToggle, you must call it during
     * onPostCreate() and onConfigurationChanged()...
     */

    @Override
    protected void onPostCreate(Bundle savedInstanceState) {
        super.onPostCreate(savedInstanceState);
        // Sync the toggle state after onRestoreInstanceState has occurred.
        mDrawerToggle.syncState();
    }

    @Override
    public void onConfigurationChanged(Configuration newConfig) {
        super.onConfigurationChanged(newConfig);
        // Pass any configuration change to the drawer toggls
        mDrawerToggle.onConfigurationChanged(newConfig);
    }

}

采纳答案by Skizo-oz??S

Use the following code lines:

使用以下代码行：

button = (Button)rootView.findViewById(R.id.button1);
button.setOnClickListener(this); // Best Solution <---
button.setOnClickListener(rootView);

or

或者

button.setOnClickListener(getActivity());

---

---

Then, you have to call the onClick()method as follows:

然后，您必须onClick()按如下方式调用该方法：

@Override
public void onClick(View v) {
    switch (v.getId()) {
        case R.id.button1:
            // CODE TO DO
            break;
    }
}

Also, you can do:

此外，你可以这样做：

import android.view.View.OnClickListener;

button = (Button) rootView.findViewById(R.id.button1);
button.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
        // Your Code Lines
    }

EDIT

编辑

I think your code is fine. The only thing you have to do is adding: button.setOnClickListener(this);then, add the switchstatement for v.getId()in your OnClickmethod.

我认为你的代码很好。您唯一需要做的就是添加：button.setOnClickListener(this);然后，在您的方法中添加switch语句。v.getId()OnClick

EDIT2

编辑2

package info.androidhive.slidingmenu;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import android.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


public class FindPeopleFragment extends Fragment
implements View.OnClickListener {
        EditText edit;
        TextView text;
        Button button;

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

            View rootView = inflater.inflate(R.layout.activity_ping, container, false);


            EditText edit = (EditText) rootView.findViewById(R.id.editText1);
            edit.setText("192.168.1.1");
            text = (TextView) rootView.findViewById(R.id.textView1);
            button = (Button) rootView.findViewById(R.id.button1);
            button.setOnClickListener(this);

            return rootView;
        }

        @Override
        public void onClick(View v) {

            switch (v.getId()) {
                case R.id.button1:
                    Editable host = edit.getText();
                    try {
                        String pingCmd = "ping -c 5 " + host;
                        String pingResult = "";
                        Runtime r = Runtime.getRuntime();
                        Process p = r.exec(pingCmd);
                        BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
                        String inputLine;
                        while ((inputLine = in .readLine()) != null) {
                            System.out.println(inputLine);
                            text.setText(inputLine + "\n\n");
                            pingResult += inputLine;
                            text.setText(pingResult);
                        } in .close();
                    } //try
                    catch (IOException e) {
                        System.out.println(e);
                    }
                    break;
                    case default:
                    log.i("Inf", "there's no click");
                    break;
            }
     }
     }

EDIT3

编辑3

package info.androidhive.slidingmenu;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import android.app.Fragment;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


public class FindPeopleFragment extends Fragment
implements OnClickListener {
        EditText edit;
        TextView text;
        Button button;
        Editable Edit2 ;

        @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

            View rootView = inflater.inflate(R.layout.activity_ping, container, false);


            EditText edit = (EditText) rootView.findViewById(R.id.editText1);
            edit.setText("192.168.1.1");
            Edit2 = edit.getText();
            text = (TextView) rootView.findViewById(R.id.textView1);
            button = (Button) rootView.findViewById(R.id.button1);
            button.setOnClickListener(this);

            return rootView;
        }



        @Override
        public void onClick(View v) {

            switch (v.getId()) {
                case R.id.button1:


                    try {
                        String pingCmd = "ping -c 5 " + Edit2;
                        String pingResult = "";
                        Runtime r = Runtime.getRuntime();
                        Process p = r.exec(pingCmd);
                        BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()));
                        String inputLine;
                        while ((inputLine = in .readLine()) != null) {
                            System.out.println(inputLine);
                            text.setText(inputLine + "\n\n");
                            pingResult += inputLine;
                            text.setText(pingResult);
                        } in .close();
                    } //try
                    catch (IOException e) {
                        System.out.println(e);
                    }
                    break;


            }
        }
     }

回答by dhuma1981

Just change your button listener assignment like this:

只需像这样更改您的按钮侦听器分配：

button.setOnClickListener(FindPeopleFragment.this);

because you have to pass the reference of the class which has implemented OnClickListener. If you write thislike this way button.setOnClickListener(this);it will pass current activity context in place of current fragment reference.

因为你必须传递已经实现的类的引用OnClickListener。如果你写this这样的方式 button.setOnClickListener(this);，将通过当前活动的上下文到位当前片段参考。

回答by Xcihnegn

Change your listener set line in onCreateView:

更改您的侦听器设置行onCreateView：

button.setOnClickListener(onClickListener);

to be:

成为：

button.setOnClickListener(this);