Android Bundle 类
Bundle 类是一个key---value对,“A mapping from String values to various Parcelable types”
类的继承关系:
java.lang.Object
android .os .Bundle
Bundle类是一个final类:
public final class Bundle extends Object implements Parcelabe 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,用来封装要传递的信息
Bundle mBundle = new Bundle();
(2)、bundle类中加入数据(key--value的形式,另一个activity里面去数据的时候,就要用到key,找出对应的value)
mBundle.putString("date","date from TestBundle");
(3)、新建一个intent对象,用来传递bundle对象。
Intent intent = new Intent();
intent.setClass(TestBundle.this,Target.class);
intent.putExtras(mBundle);
完整的代码:
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); } }