豆瓣客户端的实现08

JSON数据解析与Android客户端实现

最新推荐文章于 2021-05-31 05:28:20 发布

原创最新推荐文章于 2021-05-31 05:28:20 发布 · 550 阅读

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CC 4.0 BY-SA版权

需求分析

JSON数据解析

快点实现客户端吧

开始

URL地址 http://api.douban.com/book/subject/isbn/7543632608?alt=json

返回的JSON数据

{
"category": {
"@scheme": "http://www.douban.com/2007#kind",
"@term": "http://www.douban.com/2007#book"
},
"db:tag": [
{
"@count": 126,
"@name": "片山恭一"
},
{
"@count": 60,
"@name": "日本"
},
{
"@count": 54,
"@name": "日本文学"
},
{
"@count": 37,
"@name": "小说"
},
{
"@count": 31,
"@name": "满月之夜白鲸现"
},
{
"@count": 14,
"@name": "爱情"
},
{
"@count": 8,
"@name": "純愛"
},
{
"@count": 8,
"@name": "外国文学"
}
],
"title": {
"$t": "满月之夜白鲸现"
},
"author": [
{
"name": {
"$t": "[日] 片山恭一"
}
}
],
"summary": {
"$t": "那一年，是听莫扎特、钓鲈鱼和家庭破裂的一年。说到家庭破裂，母亲怪自己当初没有找到好男人，父亲则认为当时是被狐狸精迷住了眼，失常的是母亲，但出问题的是父亲……。"
},
"link": [
{
"@rel": "self",
"@href": "http://api.douban.com/book/subject/1220562"
},
{
"@rel": "alternate",
"@href": "http://book.douban.com/subject/1220562/"
},
{
"@rel": "image",
"@href": "http://img3.douban.com/spic/s1747553.jpg"
},
{
"@rel": "mobile",
"@href": "http://m.douban.com/book/subject/1220562/"
}
],
"db:attribute": [
{
"$t": "7543632608",
"@name": "isbn10"
},
{
"$t": "9787543632608",
"@name": "isbn13"
},
{
"$t": "满月之夜白鲸现",
"@name": "title"
},
{
"$t": "180",
"@name": "pages"
},
{
"$t": "豫人",
"@name": "translator"
},
{
"$t": "[日] 片山恭一",
"@name": "author"
},
{
"$t": "15.00元",
"@name": "price"
},
{
"$t": "青岛出版社",
"@name": "publisher"
},
{
"$t": "平装",
"@name": "binding"
},
{
"$t": "2005-1",
"@name": "pubdate"
}
],
"id": {
"$t": "http://api.douban.com/book/subject/1220562"
},
"gd:rating": {
"@min": 0,
"@numRaters": 324,
"@average": "7.0",
"@max": 10
}
}

上源码和效果图

MainActivity.java

public class MainActivity extends Activity {
	TextView tv_title;
	TextView tv_summary;
	LinearLayout ll_loading;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		super.onCreate(savedInstanceState);
		setContentView(R.layout.book_detail);
		tv_title = (TextView) this.findViewById(R.id.tv_title);
		tv_summary = (TextView) this.findViewById(R.id.tv_summary);
		ll_loading = (LinearLayout) this.findViewById(R.id.ll_book_detail);
		String isbn = "";
		fillData(isbn);

	}

	private void fillData(String isbn) {
		new AsyncTask<String, Void, Boolean>() {
			String title;
			String summary;
			String price;

			@Override
			protected Boolean doInBackground(String... params) {
				// http://api.douban.com/book/subject/isbn/7543632608?alt=json
				String path = "http://api.douban.com/book/subject/isbn/7543632608?alt=json";

				try {
					URL url = new URL(path);

					Source source = new Source(url.openConnection());
					String jsonstr = source.toString();
					JSONObject jsonobj = new JSONObject(jsonstr);
					String titlestr = jsonobj.get("title").toString();
					JSONObject jsontitle = new JSONObject(titlestr);
					title = jsontitle.get("$t").toString();
					System.out.println(title);

					String summarystr = jsonobj.get("summary").toString();
					if (summarystr != null) {
						JSONObject jsonsummary = new JSONObject(summarystr);
						summary = jsonsummary.get("$t").toString();
						System.out.println(summary);
					}

					String attributestr = jsonobj.get("db:attribute")
							.toString();
					JSONArray attributearray = new JSONArray(attributestr);
					for (int i = 0; i < attributearray.length(); i++) {
						JSONObject jsonatt = new JSONObject(attributearray.get(
								i).toString());
						if ("price".equals((jsonatt.get("@name").toString()))) {
							price = jsonatt.get("$t").toString();
							System.out.println(price);
						}
					}
					return true;

				} catch (Exception e) {
					e.printStackTrace();
					return false;
				}

			}

			@Override
			protected void onPreExecute() {
				ll_loading.setVisibility(View.VISIBLE);
				super.onPreExecute();
			}

			@Override
			protected void onPostExecute(Boolean result) {
				ll_loading.setVisibility(View.INVISIBLE);
				if (result) {
					tv_title.setText(title + "/" + price);
					tv_summary.setText(summary);
				} else {
					Toast.makeText(getApplicationContext(), "查看详情失败", 1).show();
				}
				super.onPostExecute(result);
			}

		}.execute(isbn);
	}
}

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" >

    <TableLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <TableRow
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="标题" />

            <TextView
                android:id="@+id/tv_title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        </TableRow>

        <TableRow
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="简介" />

            <TextView
                android:id="@+id/tv_summary"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content" />
        </TableRow>
    </TableLayout>

    <LinearLayout
        android:id="@+id/ll_book_detail"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@android:color/background_dark"
        android:gravity="center"
        android:visibility="invisible" >

        <ProgressBar
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" />
    </LinearLayout>

</FrameLayout>

AndroidManifest.xml

<uses-permission android:name="android.permission.INTERNET"/>

源码分析

查看Android中 System.put.println的输出

在Logcat中找标签设置为system.out