兩個Activity之間的資料傳遞(使用簡單的intent方法)
阿新 • • 發佈:2018-12-31
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);
}
}