Android的应用程序崩溃的FragmentTransaction.replace [英] Android App Crashes on FragmentTransaction.replace

问题描述

我试图用support.v4库插入碎片进入我为我的主要活动定义的FrameLayout创建一个动态UI。

I'm attempting to create a dynamic UI using the support.v4 library to insert fragments into a framelayout I have defined for my main activity.

下面是我的activity_main.xml中：

Here is my activity_main.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="horizontal"
android:baselineAligned="false" >

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="fill_parent"
        android:layout_weight="1"
        android:orientation="vertical" >
        <Button
            android:id="@+id/button_report"
            android:text="@string/button_report"
        android:textSize="22sp"
            android:layout_width="fill_parent"
            android:layout_height="0dp"
            android:layout_weight="1" />
        <Button
            android:id="@+id/button_pay"
            android:text="@string/button_pay"
            android:textSize="22sp"
            android:layout_width="fill_parent"
            android:layout_height="0dp"
            android:layout_weight="1" />
        <Button
            android:id="@+id/button_contact"
            android:text="@string/button_contact"
            android:textSize="22sp"
            android:layout_width="fill_parent"
            android:layout_height="0dp"
            android:layout_weight="1" />
    </LinearLayout>    

    <FrameLayout
        android:id="@+id/container"
        android:layout_width="0dp"
        android:layout_height="fill_parent"
        android:layout_weight="2" />

</LinearLayout> 

这里是MainActivity.java：

And here is the MainActivity.java:

package com.example.Test;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentTransaction;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends FragmentActivity
{
    // Declare button variables
protected Button btnReport;
protected Button btnPay;
protected Button btnContact;

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

        // Assign buttons
        btnReport = (Button)findViewById(R.id.button_report);
        btnPay = (Button)findViewById(R.id.button_pay);
        btnContact = (Button)findViewById(R.id.button_contact);
        // Import fragments
        final Fragment fragmentPhone = new FragmentPhone();
        final Fragment fragmentReport = new FragmentReport();
        final Fragment fragmentPay = new FragmentPay();

        final android.support.v4.app.FragmentManager fm = getSupportFragmentManager();  
        final FragmentTransaction ft = fm.beginTransaction();

        // Check for existing fragment, if none then add FragmentPhone.class
        if (savedInstanceState != null) return;
        else {  
        ft.add(R.id.container, fragmentPhone);
        ft.commit();
        }

// "Report" button        
        btnReport.setOnClickListener(new OnClickListener()  {           
    public void onClick(View v) {
    ft.replace(R.id.container, fragmentReport); //Replace the details_container
    ft.addToBackStack(null);    // Add transaction to back stack
            ft.commit();    // Commit the transaction
    }
    });
// "Pay" button
    btnPay.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {
        ft.replace(R.id.container, fragmentPay);
        ft.addToBackStack(null);
            ft.commit();
        }
    });
// "Contact" button
    btnContact.setOnClickListener(new OnClickListener() {
        public void onClick(View v) {               
        ft.replace(R.id.container, fragmentPhone);
        ft.addToBackStack(null);
            ft.commit();
        }
    });

    }
}

这是我的FragmentPhone类：

And here is my FragmentPhone class:

package com.example.Test;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class FragmentPhone extends Fragment {

 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_phone, container, false);

}
}

当我启动应用程序中，XML正确加载和的FrameLayout被充满fragmentPhone，但pressing任何按钮，创建一个应用程序已意外停止对话，并提示我强制关闭。

When I launch the app, the xml loads correctly and the framelayout gets filled with fragmentPhone, but pressing any of the buttons creates an "app has stopped unexpectedly" dialogue and prompts me to force close.

任何意见或建议，将大大AP preciated。谢谢！

Any ideas or suggestions will be greatly appreciated. Thanks!

推荐答案

我最终重新获得并重新申报各onClickListener内FragmentManager和FragmentTransaction。我也删除addToBackStack作为我决定这是不必要的。这里是我的电流，工作code：

I ended up re-getting and re-declaring FragmentManager and FragmentTransaction within each onClickListener. I also removed "addToBackStack" as I decided it was unneeded. Here is my current, working code:

// "Report" button        
    btnReport.setOnClickListener(new OnClickListener()  {           
        public void onClick(View v) {
            android.support.v4.app.FragmentManager fragmentManager1 = getSupportFragmentManager();
            FragmentTransaction fragmentTransaction1 = fragmentManager1.beginTransaction();
            fragmentTransaction1.replace(R.id.container, fragmentReport);
            fragmentTransaction1.commit();
        }
    });

这篇关于Android的应用程序崩溃的FragmentTransaction.replace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！