Android应用之《宋词三百首》(二)

 接上回，上回我们讲到MainActivity里面将所有的宋词标题和作者显示到界面的ListView中去，我们接下来的工作是通过点击ListView的Item跳转到ContentActivity里面去显示单个宋词的所有内容，跳转代码例如以下：

// 为ListView的Item设置点击监听器
		mListView.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				// 将当前被点击的item所代表的诗词对象的引用赋给currentSongCi
				Global.currentSongCi = scList.get(position);
				// 进行界面跳转
				Intent intent = new Intent(MainActivity.this,
						ContentActivity.class);
				startActivity(intent);
			}
		});

在这里，我用一个静态变量将所点击的ListView Item所代表的宋词记录下来，然后跳转到ContentActivity。

我们在来首先看一下ContentActivity的布局文件activity_content.xml的内容：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@id/ll_parent"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/bg4"
    android:orientation="vertical" >

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="46.0dip"
        android:background="@drawable/toolbar" >

        <TextView
            android:id="@id/tv_app_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:layout_centerVertical="true"
            android:text="@string/app_name"
            android:textAppearance="?android:textAppearanceLarge"
            android:textColor="#ffffffff" />

        <Button
            android:id="@id/btn_back"
            android:layout_width="72.0dip"
            android:layout_height="46.0dip"
            android:layout_alignParentLeft="true"
            android:layout_centerVertical="true"
            android:background="@drawable/btn_left"
            android:paddingLeft="6.0dip"
            android:text="@string/back"
            android:textColor="#ffffffff"
            android:textSize="14.0sp" />

        <ImageView
            android:id="@id/iv_font_small"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"
            android:src="@drawable/font_small" />

        <ImageView
            android:id="@id/iv_font_big"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_toLeftOf="@id/iv_font_small"
            android:src="@drawable/font_big" />
    </RelativeLayout>

    <ScrollView
        android:id="@id/scrollView1"
        android:layout_width="fill_parent"
        android:layout_height="0.0dip"
        android:layout_margin="8.0dip"
        android:layout_weight="1.0"
        android:background="@drawable/item_bg2" >

        <LinearLayout
            android:id="@id/linearLayout1"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:orientation="vertical" >

            <TextView
                android:id="@id/tv_title"
                style="@style/black_normal"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_margin="5.0dip"
                android:text="标题"
                android:textAppearance="?android:textAppearanceMedium" />

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="1.0px"
                android:layout_marginLeft="5.0dip"
                android:layout_marginRight="5.0dip"
                android:background="#ff666666" />

            <TextView
                android:id="@id/tv_author"
                style="@style/black_normal"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_margin="5.0dip"
                android:text="作者"
                android:textAppearance="?android:textAppearanceSmall" />

            <LinearLayout
                android:layout_width="fill_parent"
                android:layout_height="1.0px"
                android:layout_marginLeft="5.0dip"
                android:layout_marginRight="5.0dip"
                android:background="#ff666666" />

            <TextView
                android:id="@id/tv_desc"
                style="@style/black_normal"
                android:layout_width="fill_parent"
                android:layout_height="fill_parent"
                android:layout_margin="5.0dip"
                android:lineSpacingMultiplier="1.3"
                android:text="注解"
                android:textAppearance="?android:textAppearanceSmall" />
        </LinearLayout>
    </ScrollView>

</LinearLayout>

接着我们再来看一下ContentActivity的内容：

package com.example.songcidemo.ui;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.text.Html;
import android.text.Spanned;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.songcidemo.R;
import com.example.songcidemo.bean.SongCi;
import com.example.songcidemo.util.Global;

public class ContentActivity extends Activity {

	private SongCi sc;
	
	//字体变小button
	private ImageView fontSmallImageView;
	//字体变大button
	private ImageView fontBigImageView;
	
	//代表作者TextView和主体TextView的文本文字大小默认值
	private float defaultTextSize;
	//代表当前标题TextView的文本文字大小
	private float currentTitleTextSize;
	//代表当前作者TextView和主体TextView的文本文字大小
	private float currentTextSize;
	
	//代表标题TextView
	private TextView titleTextView;
	//代表作者TextView
	private TextView authTextView;
	//代表主要内容TextView
	private TextView descTextView;
	
	//代表返回button
	private Button backBtn;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.activity_content);

		setupViews();
	}
	
	/**
	 * 初始化界面
	 */
	private void setupViews() {
		
		//通过findviewbyid()方法获取三个TextView控件
		titleTextView = (TextView) findViewById(R.id.tv_title);
		authTextView = (TextView) findViewById(R.id.tv_author);
		descTextView = (TextView) findViewById(R.id.tv_desc);
		
		//将currentSongCi赋给类变量sc
		sc = Global.currentSongCi;
		//通过get()方法获取标题、作者、内容的值 
		String title = sc.getTitle();
		String auth = sc.getAuth();
		String desc = sc.getDesc();
		
		//将宋词的内容显示到三个TextView控件
		titleTextView.setText(title);
		authTextView.setText(auth);
		//对字符串进行HTML格式化
		Spanned sp = Html.fromHtml(desc);
		descTextView.setText(sp);
//		descWebView.loadDataWithBaseURL("fake://not/needed", desc, "text/html",
//				"utf-8", "");
		
		Log.v("ContentActivity", "" + titleTextView.getTextSize());
		Log.v("ContentActivity", "" + authTextView.getTextSize());
		Log.v("ContentActivity", "" + descTextView.getTextSize());
		
		//初始化字体大小变量
		defaultTextSize = 14;
		currentTitleTextSize = 20;
		currentTextSize = 14;
		
		fontBigImageView = (ImageView) findViewById(R.id.iv_font_big);
		fontSmallImageView = (ImageView) findViewById(R.id.iv_font_small); 
		
		//为fontBigImageView设置监听器
		fontBigImageView.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				currentTitleTextSize++;
				currentTextSize++;
				if((currentTextSize-defaultTextSize) > 5){
					currentTitleTextSize--;
					currentTextSize--;
				}else{
					setFont();
				}
			}
		});
		
		//为fontSmallImageView设置监听器
		fontSmallImageView.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				currentTitleTextSize--;
				currentTextSize--;
				if((defaultTextSize-currentTextSize) > 5){
					currentTitleTextSize++;
					currentTextSize++;
				}else{
					setFont();
				}
			}
		});
		
		backBtn = (Button) findViewById(R.id.btn_back);
		
		//为backBtn设置监听器
		backBtn.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				//返回到主界面
				Intent intent = new Intent(ContentActivity.this, MainActivity.class);
				startActivity(intent);
			}
		});
		
	}
	
	/**
	 * 设置界面字体大小
	 */
	private void setFont(){
		titleTextView.setTextSize(currentTitleTextSize);
		authTextView.setTextSize(currentTextSize);
		descTextView.setTextSize(currentTextSize);
	}

}

Spanned sp = Html.fromHtml(desc);

界面截图例如以下：

最后我们再来实现一个主界面的搜索功能，我的思想是这种定义一个ArrayList<SongCi> resultList这种链表，由于已经有了scList里面存储的是所有的宋词，用for循环遍历scList，将满足搜索条件的结果增加到resultList其中去，搜索完毕后就将ListView显示resultList里面的内容，关键代码例如以下：

//为searchDialogBtn设置点击监听器
		searchDialogBtn.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View v) {
				switch (currentSearchRadioButtonId) {
				case R.id.radio0:
					searchSongCi(SEARCH_TYPE_TITLE);
					break;
				case R.id.radio1:
					searchSongCi(SEARCH_TYPE_AUTHOR);
					break;
				case R.id.radio2:
					searchSongCi(SEARCH_TYPE_CONTENT);

				default:
					break;
				}
				//将搜索对话框消失掉
				if (searchDialog.isShowing()) {
					searchDialog.dismiss();
				}
				
				//初始化结果列表适配器resultSongCiAdapter
				if (resultSongCiAdapter == null) {
					resultSongCiAdapter = new MainListViewAdapter(
							MainActivity.this, resultList);
				}else{
					//通知适配器，源数据已改变
					resultSongCiAdapter.notifyDataSetChanged();
				}

				mListView.setAdapter(resultSongCiAdapter);

			}
		});

/**
	 * 通过传递过来的參数来搜索宋词结果
	 * 
	 * @param searchType	按哪种条件(标题、词人、内容)进行搜索
	 */
	private void searchSongCi(int searchType) {
		
		//初始化resultList
		if (resultList == null) {
			resultList = new ArrayList<SongCi>();
		}else{
			resultList.clear();
		}
		
		//获取搜索关键词
		String searchWords = searchEditText.getText().toString().trim();
		if (searchWords == null || searchWords.equals("")) {
			return;
		}

		for (SongCi sc : scList) {
			switch (searchType) {
			case SEARCH_TYPE_TITLE:
				String title = sc.getTitle();
				//假设标题中包括关键词，就将当前的宋词对象增加到结果链表中
				if (title.contains(searchWords)) {
					resultList.add(sc);
				}
				break;
			case SEARCH_TYPE_AUTHOR:
				String auth = sc.getAuth();
				//假设作者名中包括关键词，就将当前的宋词对象增加到结果链表中
				if (auth.contains(searchWords)) {
					resultList.add(sc);
				}
				break;
			case SEARCH_TYPE_CONTENT:
				String desc = sc.getDesc();
				//假设内容中包括关键词，就将当前宋词对象增加到结果链表中
				if (desc.contains(searchWords)) {
					resultList.add(sc);
				}
				break;

			default:
				break;
			}
		}

	}

最后附上整个项目的源代码：

Android应用之《宋词三百首》