怎么有一个碎片没改变

[YXTS122]

<LinearLayout 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.demofragmentex.MainActivity"
    android:orientation="vertical"
    android:id="@+id/LinearLayout_All" >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:id="@+id/LinearLayout_One"
        android:orientation="horizontal"
        >
        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/FrameLayout_One"
            android:layout_weight="1"
            >
            <fragment
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:name="com.example.demofragmentex.FragmentNothing" />
 
        </FrameLayout>
 
        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/FrameLayout_Two"
            android:layout_weight="1"
            >
            <fragment
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:name="com.example.demofragmentex.FragmentNothing" />
 
        </FrameLayout>
 
    </LinearLayout>
 
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:id="@+id/LinearLayout_Two"
        android:orientation="horizontal"
        >
        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/FrameLayout_Three"
            android:layout_weight="1"
            >
            <fragment
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:name="com.example.demofragmentex.FragmentNothing" />
 
        </FrameLayout>
 
        <FrameLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:id="@+id/FrameLayout_Four"
            android:layout_weight="1"
            >
            <fragment
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:name="com.example.demofragmentex.FragmentNothing" />
 
        </FrameLayout>
 
    </LinearLayout>
 
 
</LinearLayout>
  

[YXTS122]

public class MainActivity extends FragmentActivity {
	Fragment current;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        f_onCreate();
    }
 
    private void f_onCreate(){
        FragmentNumber fragmentNumber=new FragmentNumber();
        FragmentNothing fragmentNothing=new FragmentNothing();
        FragmentManager fragmentManager=getSupportFragmentManager();
        FragmentTransaction fragmentTransaction=fragmentManager.beginTransaction();
        current=new Fragment();
        if (current==fragmentNothing)
        {
            fragmentTransaction.hide(fragmentNothing);
            fragmentTransaction.add(R.id.FrameLayout_One,fragmentNumber);
            fragmentTransaction.commit();
        }
        current=fragmentNumber;
    }
}  

public class FragmentNothing extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_nothing, container, false);
 
        return view;
    }
 
    public FragmentNothing(){
        //怎样可以避免转屏后不闪退
    }
}  

public class FragmentNumber extends Fragment {
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_number, container, false);
        //mTextView=(TextView)view.findViewById(R.id.TextView_Number);
        //int iNumber=SystemRuntime.m_iGroupIndex*4+1;
        //mTextView.setText(iNumber);
        return view;
    }
 
    public FragmentNumber(){
        //怎样可以避免转屏后不闪退
    }
 
    TextView mTextView;
}
  

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:text="Nothing"
        />
</LinearLayout>  

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    >
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/TextView_Number"
        android:text="-11111111111111111"
        />
</LinearLayout>
  

[m-oj]

你这是静态定义的fragment，你需要使用FragmentManager.findFragmentById方法获取fragment，直接new是不行的

[YXTS122]

引用 2 楼 m-oj 的回复:

你这是静态定义的fragment，你需要使用FragmentManager.findFragmentById方法获取fragment，直接new是不行的

public class MainActivity extends FragmentActivity {
	Fragment current,curr;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
 
        f_onCreate();
    }
 
    private void f_onCreate(){
        FragmentNumber fragmentNumber=new FragmentNumber();
        FragmentNothing fragmentNothing=new FragmentNothing();
        FragmentManager fragmentManager=getSupportFragmentManager();
        curr=fragmentManager.findFragmentById(R.id.frag);
        FragmentTransaction fragmentTransaction=fragmentManager.beginTransaction();
        current=new Fragment();
        if (current==fragmentNumber)
        	return;
        if (!fragmentNumber.isAdded())
        {
            fragmentTransaction.hide(curr);
            fragmentTransaction.add(R.id.FrameLayout_One,fragmentNumber);
            fragmentTransaction.commit();
        }
        else{
        	fragmentTransaction.hide(curr);
            fragmentTransaction.show(fragmentNumber);
            fragmentTransaction.commit();
        }
        current=fragmentNumber;
    }
}
  

改好了

[YXTS122]