Android Bundle類

來源:互聯網
上載者:User

標籤:android   style   class   blog   code   java   

Bundle類是一個key-value對,“A mapping from String values to various Parcelable types.”

類繼承關係:

java.lang.Object
     android.os.Bundle

Bundle類是一個final類:
public final class
Bundle
extends Objectimplements Parcelable Cloneable

兩個activity之間的通訊可以通過bundle類來實現,做法就是:

(1)建立一個bundle類

  1. Bundle mBundle = new Bundle();   

(2)bundle類中加入資料(key -value的形式,另一個activity裡面取資料的時候,就要用到key,找出對應的value)

  1. mBundle.putString("Data", "data from TestBundle");  

(3)建立一個intent對象,並將該bundle加入這個intent對象

  1. Intent intent = new Intent();    
  2. intent.setClass(TestBundle.this, Target.class);    
  3. intent.putExtras(mBundle);  

完整代碼如下:

    <?xml version="1.0" encoding="utf-8"?>      <manifest xmlns:android="http://schemas.android.com/apk/res/android"            package="com.tencent.test"            android:versionCode="1"            android:versionName="1.0">          <application android:icon="@drawable/icon" android:label="@string/app_name">              <activity android:name=".TestBundle"                        android:label="@string/app_name">                  <intent-filter>                      <action android:name="android.intent.action.MAIN" />                      <category android:name="android.intent.category.LAUNCHER" />                  </intent-filter>              </activity>          <activity android:name=".Target"></activity>          </application>          <uses-sdk android:minSdkVersion="7" />      </manifest>   

兩個類如下:intent從TestBundle類發起,到Target類。

類1:TestBundle類:

    import android.app.Activity;        import android.content.Intent;        import android.os.Bundle;        import android.view.View;      import android.view.View.OnClickListener;      import android.widget.Button;            public class TestBundle extends Activity {                      private Button button1;          private OnClickListener cl;           public void onCreate(Bundle savedInstanceState) {                super.onCreate(savedInstanceState);                setContentView(R.layout.main);                            button1 = (Button) findViewById(R.id.button1);              cl = new OnClickListener(){                  @Override                  public void onClick(View arg0) {                      // TODO Auto-generated method stub                       Intent intent = new Intent();                        intent.setClass(TestBundle.this, Target.class);                        Bundle mBundle = new Bundle();                        mBundle.putString("Data", "data from TestBundle");//壓入資料                         intent.putExtras(mBundle);                        startActivity(intent);                  }              };              button1.setOnClickListener(cl);          }      }    

類2: Target

    import android.app.Activity;        import android.os.Bundle;              public class Target extends Activity{                  public void onCreate(Bundle savedInstanceState) {                              super.onCreate(savedInstanceState);                setContentView(R.layout.target);                <span style="color:#ff6600;">Bundle bundle = getIntent().getExtras();   </span> //得到傳過來的bundle               String data = bundle.getString("Data");//讀出資料                 setTitle(data);                  }        }    

布局檔案:

main.xml

    <?xml version="1.0" encoding="utf-8"?>      <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"          android:orientation="vertical"          android:layout_width="fill_parent"          android:layout_height="fill_parent"          >      <TextView            android:layout_width="fill_parent"           android:layout_height="wrap_content"           android:text="@string/hello"          />      <Button            android:layout_width="fill_parent"           android:layout_height="wrap_content"           android:text="@string/button"          android:id = "@+id/button1"          />       </LinearLayout>  

target.xml

<?xml version="1.0" encoding="utf-8"?>  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"      android:orientation="vertical"      android:layout_width="fill_parent"      android:layout_height="fill_parent"      >  <TextView        android:layout_width="fill_parent"       android:layout_height="wrap_content"       android:text="@string/target"      />  </LinearLayout

String.xml

    <?xml version="1.0" encoding="utf-8"?>      <resources>          <string name="hello">Hello World, TestBundle!</string>          <string name="app_name">測試Bundle用法</string>          <string name="button">點擊跳轉</string>          <string name="target">來到target activity</string>      </resources>  

 結果:

 

跳轉結果:

轉:http://www.cnblogs.com/xiaoruhan/archive/2012/03/02/2377117.html

聯繫我們

該頁面正文內容均來源於網絡整理,並不代表阿里雲官方的觀點,該頁面所提到的產品和服務也與阿里云無關,如果該頁面內容對您造成了困擾,歡迎寫郵件給我們,收到郵件我們將在5個工作日內處理。

如果您發現本社區中有涉嫌抄襲的內容,歡迎發送郵件至: info-contact@alibabacloud.com 進行舉報並提供相關證據,工作人員會在 5 個工作天內聯絡您,一經查實,本站將立刻刪除涉嫌侵權內容。

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.