Android Bundle类

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此文原作者:randyjiawenjie(原文地址:http://blog.csdn.net/randyjiawenjie/article/details/6651437)

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

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)

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

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

完整代码如下:

android mainfest.xml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 = bundle.getString("Data");//读出数据            setTitle(data);        }    }    

布局文件:

<?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:
结果

跳转结果:
跳转结果

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