Question

我想知道如何在活动中添加片段（通过xml（最好是）或java），而不会崩溃你的应用。我无法添加它，我看了很多教程，但无法理解。每次我将片段添加到主要活动时，我的应用程序都会崩溃。

MainActivity.java

package com.example.mashh.fragments;

import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

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

activity_main.xml中

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.mashh.fragments.MainActivity"
    android:orientation="vertical">

    <fragment
        android:layout_width="match_parent"
        android:layout_height="70dp"
        android:name="com.example.mashh.fragments.BlankFragment"
        tools:layout="@layout/fragment_blank" />
</LinearLayout>

BlankFragment.java

package com.example.mashh.fragments;


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


/**
 * A simple {@link Fragment} subclass.
 */
public class BlankFragment extends Fragment {


    public BlankFragment() {
        // Required empty public constructor
    }


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

}

fragment_blank.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.mashh.fragments.BlankFragment">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="@string/hello_blank_fragment" />

</FrameLayout>

Answer 1

<fragment
    android:id="@+id/blank_fragment"
    android:layout_width="match_parent"
    android:layout_height="70dp"
    android:name="com.example.mashh.fragments.BlankFragment"
    tools:layout="@layout/fragment_blank" />

xml add android:id

将片段添加到主要活动android

1 个答案: