15/9/6/Fragment

Fragment的创建方法步骤(简单的Fragment)

Fragment的方法解读

1.在MainActivity中继承FragmentActivity

2.创建一个java类继承Fragment重写里面的方法onCreatView()，通过inflate的inflate方法找到创建的布局

3.在开始的布局中添加一个FramLayout和一个RadioGroup放到布局中的最下面，就先qq上的布局一样，设置drawable或者background

4.在MainActivity中设置点击事件

5.声明一个FragmentManager。然后调用beginTransaction()方法生成一个FragmentTransaction对象，利用该对象hide、add、replace创建Fragment对象

6.最后commit一下
7.代码实现：
XML

<RelativeLayout 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=".MainActivity">
<FrameLayout
    android:id="@+id/frame_fragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"></FrameLayout>
<RadioGroup
    android:layout_width="match_parent"
    android:layout_height="80dp"
    android:orientation="horizontal"
    android:layout_alignParentBottom="true"
    android:gravity="center">
    <RadioButton
        android:id="@+id/radiobutton_smg"
        style="@style/CheckedStyle"
        android:drawableTop="@drawable/conversation_checked"/>
    <RadioButton
        android:id="@+id/radiobutton_link"
        style="@style/CheckedStyle"
        android:drawableTop="@drawable/contact_checked"/>
    <RadioButton
        android:id="@+id/radiobutton_dynamic"
        style="@style/CheckedStyle"
        android:drawableTop="@drawable/plugin_checked"/>
</RadioGroup>
</RelativeLayout>

Java类

public class FragmentExample extends Fragment {
    private Button mBtnExample;
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view=inflater.inflate(R.layout.fragment_example,null);
        mBtnExample= (Button) view.findViewById(R.id.button_example);
        mBtnExample.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getActivity(), "点击按钮", Toast.LENGTH_SHORT).show();
            }
        });
        return view;
    }
}

MainAcitvity

package com.my.fragmenttest;

import android.app.FragmentTransaction;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.support.v4.app.FragmentManager;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.FrameLayout;
import android.widget.RadioButton;

import com.my.fragmenttest.fragment.FragmentExample;
import com.my.fragmenttest.fragment.FragmentExampleThree;
import com.my.fragmenttest.fragment.FragmentExampleTwo;

public class MainActivity extends FragmentActivity implements View.OnClickListener{
    private FrameLayout mFrameLayoutFragment;
    private Button mButtonOne;
    private Button mButtonTwo;
    private Button mButtonThree;
    private FragmentExample mFragmentExample;
    private FragmentExampleTwo mFragmentExampleTwo;
    private FragmentExampleThree mFragmentExampleThree;
    private FragmentManager mFragmentManager;
    private android.support.v4.app.FragmentTransaction transaction;
    private RadioButton mRadioButtonSmg;
    private RadioButton mRadioButtonLink;
    private RadioButton mRadioButtonDynamic;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mFrameLayoutFragment= (FrameLayout) findViewById(R.id.frame_fragment);
//        mButtonOne= (Button) findViewById(R.id.button_fragment_one);
//        mButtonTwo= (Button) findViewById(R.id.button_fragment_two);
//        mButtonThree= (Button) findViewById(R.id.button_fragment_three);
//        mButtonOne.setOnClickListener(this);
//        mButtonTwo.setOnClickListener(this);
//        mButtonThree.setOnClickListener(this);
        mFragmentManager=getSupportFragmentManager();
        mFragmentExample=new FragmentExample();
        mFragmentExampleTwo=new FragmentExampleTwo();
        mFragmentExampleThree=new FragmentExampleThree();
        transaction=mFragmentManager.beginTransaction();
        transaction.add(R.id.frame_fragment,mFragmentExample);
        transaction.add(R.id.frame_fragment,mFragmentExampleTwo);
        transaction.add(R.id.frame_fragment,mFragmentExampleThree);
        transaction.hide(mFragmentExample);
        transaction.hide(mFragmentExampleTwo);
        transaction.commit();
        mRadioButtonSmg= (RadioButton) findViewById(R.id.radiobutton_smg);
        mRadioButtonLink= (RadioButton) findViewById(R.id.radiobutton_link);
        mRadioButtonDynamic= (RadioButton) findViewById(R.id.radiobutton_dynamic);
        mRadioButtonSmg.setOnClickListener(this);
        mRadioButtonLink.setOnClickListener(this);
        mRadioButtonDynamic.setOnClickListener(this);
    }
    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.radiobutton_smg:
                transaction=mFragmentManager.beginTransaction();
                transaction.hide(mFragmentExampleTwo);
                transaction.hide(mFragmentExampleThree);
                transaction.show(mFragmentExample);
                transaction.commit();
                break;
            case R.id.radiobutton_link:
                transaction=mFragmentManager.beginTransaction();
                String text=mFragmentExampleThree.setText();
                mFragmentExampleTwo.getText(text);
                transaction.hide(mFragmentExample);
                transaction.hide(mFragmentExampleThree);
                transaction.show(mFragmentExampleTwo);
                transaction.commit();
                break;
            case R.id.radiobutton_dynamic:
                transaction=mFragmentManager.beginTransaction();
                transaction.hide(mFragmentExample);
                transaction.hide(mFragmentExampleTwo);
                transaction.show(mFragmentExampleThree);
                transaction.commit();
                break;
            default:
                break;
        }
    }
}