按钮侦听在片段的Andr​​oid按钮 [英] Button Listener for button in fragment in android

问题描述

我是新来的Andr​​oid，并试图了解我自己。但我有一个艰难的时间片段。我创建了一个简单的应用程序来学习片段。我觉得它可能看起来很傻，但我真的不能得到这个工作。

I am new to Android and trying to learn on my own. But I am having a tough time with Fragments. I am creating a simple application to learn fragments. I think it may seem silly but I really can't get this to work.

我想要做的是一个按钮（buttonSayHi）在Fragment_One的点击，Fragment_One应Fragment_Two更换。

All I want to do is on the click of a button (buttonSayHi) in Fragment_One, Fragment_One should be replaced by Fragment_Two.

我不知道，当片段code被调用，并在那里我应该写我的code调用第二个片段。我得到的错误：无法启动活动组件

I am not sure when the Fragment code is called and where am I supposed to write my code to call the second fragment. I get the error: Unable to start Activity component.

不过，code工作正常，如果我放弃侦听器按钮和片段的活动中显示出来。

However, the code works fine if I discard the listener for button and the fragment is displayed within the activity.

我已经做了相当多的研究，阅读片段教程developer.android.com，也是本教程由拉尔斯Vogella。我觉得我的概念并不清楚。

I have done considerable research, read the fragments tutorial on developer.android.com and also the tutorial by Lars Vogella. I think my concepts are not clear.

任何帮助将AP preciated。

Any help will be appreciated.

以下是code：

activity_main.xml

activity_main.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/frameLayoutFragmentContainer"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

</FrameLayout>

fragment_one.xml

fragment_one.xml

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <EditText
        android:id="@+id/editTextPersonName"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPersonName" >

        <requestFocus />
    </EditText>

    <Button
        android:id="@+id/buttonSayHi"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Say Hi" 
        android:onClick="onButtonClicked"/>

</LinearLayout>

fragment_two.xml

fragment_two.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textViewResult"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="I will say Hi!" />

</LinearLayout>

MainActivity.java

MainActivity.java

package com.example.fragmenttutorial;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;

public class MainActivity extends Activity{

    View view;
    FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

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

        Fragment fragmentOne = new FragmentOne();

        fragmentTransaction.add(R.id.frameLayoutFragmentContainer, fragmentOne);
        fragmentTransaction.addToBackStack(null);

        fragmentTransaction.commit();
    }

    protected void onButtonClicked()
    {
        if(view.getId() == R.id.buttonSayHi){
            Fragment fragmentTwo = new FragmentTwo();

            fragmentTransaction.replace(R.id.frameLayoutFragmentContainer, fragmentTwo);
            fragmentTransaction.addToBackStack(null);

            fragmentTransaction.commit();   

        }

    }
}

FragmentOne.java

FragmentOne.java

package com.example.fragmenttutorial;

import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class FragmentOne extends Fragment{

    View view;
    FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

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

        View view = inflater.inflate(R.layout.fragment_one, container, false);
        return view;
    }

//  protected void onButtonClicked()
//  {
//      if(view.getId() == R.id.buttonSayHi){
//          Fragment fragmentTwo = new FragmentTwo();
//
//          fragmentTransaction.replace(R.id.frameLayoutFragmentContainer, fragmentTwo);
//          fragmentTransaction.addToBackStack(null);
//
//          fragmentTransaction.commit();   
//
//      }
//
//  }
}

我都谈到了上点击code在片段。我也曾尝试实施onClickListener在片段。

I have commented out the on click code in the fragment. I have also tried implementing the onClickListener in the fragment.

FragmentTwo.java

FragmentTwo.java

package com.example.fragmenttutorial;

import android.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class FragmentTwo extends Fragment{

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

        View view = inflater.inflate(R.layout.fragment_two, container, false);
        return view;    
    }
}

编辑：我已删除了该行的android：的onClick =从我的code。在XMLonButtonClicked。和编辑下列文件，但它仍然无法正常工作。你们能为我提供一个工作的例子没有了android：的onClick =onButtonClicked行

I have removed the line android:onClick="onButtonClicked" from my code in XML. And edited the following files but it still does not work. Can you guys provide me a working example without the android:onClick="onButtonClicked" line.

MainActivity.java

MainActivity.java

package com.example.fragmenttutorial;

import android.os.Bundle;
import android.view.View;
import android.app.Activity;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;

public class MainActivity extends Activity{

    View view;
    Fragment fragmentOne;
    FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

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

        fragmentOne = new FragmentOne();

        fragmentTransaction.add(R.id.frameLayoutFragmentContainer, fragmentOne);
        fragmentTransaction.addToBackStack(null);

        fragmentTransaction.commit();       
    }
}

FragmentOne.java

FragmentOne.java

package com.example.fragmenttutorial;

import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.Button;

public class FragmentOne extends Fragment implements OnClickListener{

    View view;
    Fragment fragmentTwo;
    FragmentManager fragmentManager = getFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

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

        View view = inflater.inflate(R.layout.fragment_one, container, false);
        Button buttonSayHi = (Button) view.findViewById(R.id.buttonSayHi);
        buttonSayHi.setOnClickListener(this);
        return view;
    }

    @Override
    public void onClick(View v) {

        fragmentTwo = new FragmentTwo();

        fragmentTransaction.replace(R.id.frameLayoutFragmentContainer, fragmentTwo);
        fragmentTransaction.addToBackStack(null);

        fragmentTransaction.commit();   

    }
}

感谢您的宝贵意见。

推荐答案

您片段类应该实现OnClickListener

Your fragment class should implement OnClickListener

public class SmartTvControllerFragment extends Fragment implements View.OnClickListener

然后得到视图，链接按钮，并设置onClickListener类似的例子在下面

Then get view, link button and set onClickListener like in example below

 View view;

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

    view = inflater.inflate(R.layout.smart_tv_controller_fragment, container, false);
    upButton = (Button) view.findViewById(R.id.smart_tv_controller_framgment_up_button);
    upButton.setOnClickListener(this);
    return view;
 }

然后添加onClickListener方法，做你想做的。

And then add onClickListener method and do what you want.

@Override
public void onClick(View v) {
 //do what you want to do when button is clicked
    switch (v.getId()) {
        case R.id.textView_help:
            switchFragment(HelpFragment.TAG);
            break;
        case R.id.textView_settings:
            switchFragment(SettingsFragment.TAG);
            break;
    }
}

这是我的code的例子，但我希望你明白

This is my example of code, but I hope you understood

这篇关于按钮侦听在片段的Andr​​oid按钮的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！