alltolove 发表于 2017-10-3 09:32:51

android编程4.2.2

本帖最后由 alltolove 于 2017-10-3 09:34 编辑

我们既要碎片化学习也要碎片化编程,碎片化编程手机软件是今年来非常流行的,比如制作页签换页效果等。今天的动态添加碎片是以后比较常用的方法。我们继续昨天的项目,先在layout目录下新建another_right_fragment.xml文件:<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">
<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/another"
    android:textSize="20sp"
    android:layout_gravity="center_horizontal"
    android:text="This is another fragment"/>
</LinearLayout>
然后把这个布局文件制作成碎片,在mainactivity.java旁边新建一个AnotherRightFragment.java类package com.example.xinwei.fragmentactivity;

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

/**
* Created by xinwei on 2017/10/3.
*/

public class AnotherRightFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
      View view = inflater.inflate(R.layout.another_right_fragment,container,false);
      return view;
    }
}

然后,换一个可以被替换的控件,修改activity_main.xml文件:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <fragment
      android:layout_width="0dp"
      android:layout_height="match_parent"
      android:layout_weight="1"
      android:id="@+id/left_fragment"
      android:name="com.example.xinwei.fragmentactivity.LeftFragment" />

    <FrameLayout
      android:layout_width="0dp"
      android:layout_height="match_parent"
      android:id="@+id/right_layout"
      android:layout_weight="1" />
</LinearLayout>
修改mainactivity.javapackage com.example.xinwei.fragmentactivity;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{

    @Override
    protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      Button button = (Button)findViewById(R.id.button);
      button.setOnClickListener(this);
      replaceFragment(new RightFragment());
    }

    private void replaceFragment(Fragment fragment) {
      FragmentManager fragmentManager=getSupportFragmentManager();
      FragmentTransaction transition=fragmentManager.beginTransaction();
      transition.replace(R.id.right_layout,fragment);
      transition.commit();
    }

    @Override
    public void onClick(View view) {
      replaceFragment(new AnotherRightFragment());
    }



}

效果图:
页: [1]
查看完整版本: android编程4.2.2