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Android Bundle类

Bundle类是一个key-value对,“A mapping from String values to various Parcelable types.”

类继承关系:

java.lang.Object
     android.os.Bundle

Bundle类是一个final类:
public final class
Bundle
extends Objectimplements Parcelable Cloneable

两个activity之间的通讯可以通过bundle类来实现,做法就是:

(1)新建一个bundle类

  1. Bundle mBundle = new Bundle();   

(2)bundle类中加入数据(key -value的形式,另一个activity里面取数据的时候,就要用到key,找出对应的value)

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

(3)新建一个intent对象,并将该bundle加入这个intent对象

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

完整代码如下:

    <?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>   

两个类如下:intent从TestBundle类发起,到Target类。

类1:TestBundle类:

    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");//压入数据                         intent.putExtras(mBundle);                        startActivity(intent);                  }              };              button1.setOnClickListener(cl);          }      }    

类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> //得到传过来的bundle               String data = http://www.mamicode.com/bundle.getString("Data");//读出数据                 setTitle(data);                  }        }    

布局文件:

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">测试Bundle用法</string>          <string name="button">点击跳转</string>          <string name="target">来到target activity</string>      </resources>  

 结果:

 

跳转结果:

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