Android Fragment 简介及使用示例（二）

本文我们将对上一篇文章中的内容进行调整，使其能够做到兼顾屏幕分辨率。不废话，直接上代码吧。

创建资源文件 res/values-large/refs.xml

<resources>
    <item type="layout" name="activity_book_list">
        @layout/activity_book_twopane
    </item>
</resources>

布局文件 activity_book_list.xml

<?xml version="1.0" encoding="utf-8"?>
<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginStart="16dp"
    android:layout_marginEnd="16dp"
    android:name="com.toby.personal.testlistview.BookListFragment"
    android:id="@+id/book_list"
    />

布局文件 activity_book_detail.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/book_detail_container"
    />

主程序文件 BookListActivity 的代码：

package com.toby.personal.testlistview;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;

/**
 * Created by toby on 17-3-30.
 */

public class BookListActivity extends Activity implements BookListFragment.Callbacks {

    private boolean mTwoPane;

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

        if (findViewById(R.id.book_detail_container) != null) {
            mTwoPane = true;
            ((BookListFragment) getFragmentManager().findFragmentById(R.id.book_list))
                    .setActivateOnItemClick(true);
        }
    }

    @Override
    public void onItemSelected(Integer id) {
        if (mTwoPane) {
            Bundle arguments = new Bundle();
            arguments.putInt(BookDetailFragment.ITEM_ID, id);
            BookDetailFragment fragment = new BookDetailFragment();
            fragment.setArguments(arguments);
            getFragmentManager().beginTransaction().replace(R.id.book_detail_container, fragment).commit();
        } else {
            Intent detailIntent = new Intent(this, BookDetailActivity.class);
            detailIntent.putExtra(BookDetailFragment.ITEM_ID, id);
            startActivity(detailIntent);
        }
    }
}

对应的 BookDetailActivity 的代码：

package com.toby.personal.testlistview;

import android.app.ActionBar;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.view.MenuItem;

/**
 * Created by toby on 17-3-30.
 */

public class BookDetailActivity extends Activity {

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_book_detail);
        ActionBar actionBar = getActionBar();
        if (null != actionBar) {
            actionBar.setDisplayHomeAsUpEnabled(true);
        }
        if (savedInstanceState == null) {
            BookDetailFragment fragment = new BookDetailFragment();
            Bundle arguments = new Bundle();
            arguments.putInt(BookDetailFragment.ITEM_ID,
                    getIntent().getIntExtra(BookDetailFragment.ITEM_ID, 0));
            fragment.setArguments(arguments);
            getFragmentManager().beginTransaction().add(R.id.book_detail_container, fragment).commit();
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {

        if (item.getItemId() == android.R.id.home) {
            Intent intent = new Intent(this, BookListActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            startActivity(intent);
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
}

该示例在手机的虚拟机上的运行效果：

手机的虚拟机上的运行效果 1 手机的虚拟机上的运行效果 2

该示例在平板的虚拟机上的运行效果：

平板的虚拟机上的运行效果

参考文献：《疯狂Android讲义（第2版）》