android程式設計學習中，最近在編寫一個簡單的android專案，實現在TwoActivity(書籍列表)中點選LisView的任意item傳遞書名，給ThreeAvtivity（章節列表），通過接收到的資料（書名）確定顯示書的章節目錄，使用的是intent方法。其中TwoActivity中有6本書的List，ThreeActivity中每本書有十個章節

Intent 可以啟動一個Activity，也可以在啟動Activity的時候傳遞資料。intent中提供了putExtra()方法，它可以把我們想要傳遞的資料暫存在intent中，啟動了另一個Activity後，通過getIntent().getStringExtra()(其中getStringExtra()通過活動傳遞的資料型別決定是String或是其他型別)，再從 Intent中取出。

本次只使用了intent的簡單傳遞資料的方法，對於Serializable與Parcelable介面的使用，等以後真正使用後再記錄。本次例項的程式碼如下：

activity_two.xml：

<?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">Z

    <ListView
        android:id="@+id/lv_books"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="8dp"
        android:layout_margin="@dimen/dimen_book_margin"
        android:background="@color/colorGray"/>
</LinearLayout>
item_book：
<?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"
    android:background="#8f8f8f">

    <TextView
        android:id="@+id/tv_book_name"
        android:layout_width="match_parent"
        android:layout_height="40dp" />

    <TextView
        android:id="@+id/tv_book_price"
        android:layout_width="match_parent"
        android:layout_height="40dp" />

</LinearLayout>
 

activity_three.xml：

<?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:id="@+id/three_title"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:layout_marginTop="@dimen/title_margintop"
        android:text="目錄"
        android:textSize="@dimen/title"
        android:textColor="@color/title"/>

    <ListView
        android:id="@+id/lv_chapter"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_margin="@dimen/dimen_book_margin"/>

</LinearLayout>
 

item_chapter：

<?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"
    android:background="#ffeeee">

    <TextView
        android:id="@+id/tv_chapter_number"
        android:layout_width="match_parent"
        android:layout_height="20dp"/>

    <TextView
        android:id="@+id/tv_chapter_title"
        android:layout_width="match_parent"
        android:layout_height="20dp"/>

    <TextView
        android:id="@+id/tv_chapter_page"
        android:layout_width="match_parent"
        android:layout_height="20dp"/>

</LinearLayout>

TwoActivity.java

public class TwoAcitivity extends Activity{

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

        TextView tvTitle = (TextView) findViewById(R.id.two_title);
        tvTitle.setText(mykey0);

        final String[] names = {"Java", "Android", "JSP", "C/C++", "C#", "Lua"};
        int[] prices = new int[]{100, 50, 80, 60, 70, 89};
        final ArrayList<Book> mList = new ArrayList<>();
        for(int i=0;i<50;i++){
            Book mBook = new Book(names[i%6], i, prices[i%6]);
            mList.add(mBook);
        }

        ListView lvBooks = (ListView) findViewById(R.id.lv_books);
        BooksAdapter mBooksAdapter = new BooksAdapter(TwoAcitivity.this, mList);
        lvBooks.setAdapter(mBooksAdapter);

        lvBooks.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                Intent intent = new Intent(TwoAcitivity.this,ThreeActivity.class);
                intent.putExtra("bookName", mList.get(position).getName());//傳遞資料，關鍵字為“bookName”，傳遞的是書名
                startActivity(intent);

            }
        });
    }

}

ThreeActivity.java：

public class ThreeActivity extends Activity {

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

        Intent dataIntent = getIntent();//接收傳遞的資料
        String bookName = dataIntent.getStringExtra("bookName");
BookDetail mBookDetail = null;
switch (bookName) {
    case "Java":
        String[] numbers = this.getResources().getStringArray(R.array.chapter_number_java);
        String[] titles = this.getResources().getStringArray(R.array.title_java);
        int[] pages = new int[]{1, 3, 5, 7, 9, 11, 13, 15, 17, 19};
        mBookDetail = new BookDetail(numbers, titles, pages);
        break;

    case "Android":
        String[] numbers1 = this.getResources().getStringArray(R.array.chapter_number_android);
        String[] titles1 = this.getResources().getStringArray(R.array.title_android);
        int[] pages1 = new int[]{1, 5, 11, 15, 33, 34, 45, 56, 67, 78};
        mBookDetail = new BookDetail(numbers1, titles1, pages1);
        break;

    case "JSP":
        String[] numbers2 = this.getResources().getStringArray(R.array.chapter_number_jsp);
        String[] titles2 = this.getResources().getStringArray(R.array.title_jsp);
        int[] pages2 = new int[]{1, 3, 5, 7, 9, 11, 13, 15, 17, 19};
        mBookDetail = new BookDetail(numbers2, titles2, pages2);
        break;

    case "C/C++":
        String[] numbers3 = this.getResources().getStringArray(R.array.chapter_number_C1);
        String[] titles3 = this.getResources().getStringArray(R.array.title_C1);
        int[] pages3 = new int[]{1, 3, 5, 7, 9, 11, 13, 15, 17, 19};
        mBookDetail = new BookDetail(numbers3, titles3, pages3);
        break;

    case "C#":
        String[] numbers4 = this.getResources().getStringArray(R.array.chapter_number_C2);
        String[] titles4 = this.getResources().getStringArray(R.array.title_C2);
        int[] pages4 = new int[]{1, 3, 5, 7, 9, 11, 13, 15, 17, 19};
        mBookDetail = new BookDetail(numbers4, titles4, pages4);
        break;

    case "Lua":
        String[] numbers5 = this.getResources().getStringArray(R.array.chapter_number_Lua);
        String[] titles5 = this.getResources().getStringArray(R.array.title_Lua);
        int[] pages5 = new int[]{1, 3, 5, 7, 9, 11, 13, 15, 17, 19};
        mBookDetail = new BookDetail(numbers5, titles5, pages5);
        break;
}
ListView lvChapter = (ListView) findViewById(R.id.lv_chapter);
ChapterAdapter mChapterAdapter = new ChapterAdapter(ThreeActivity.this, mBookDetail.getmChapterList());
lvChapter.setAdapter(mChapterAdapter);
  }
}