Android Bundle类学习

最新推荐文章于 2022-03-07 19:22:13 发布

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最新推荐文章于 2022-03-07 19:22:13 发布

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本文详细介绍了如何利用AndroidBundle类在不同Activity之间传递数据，包括创建Bundle对象、添加数据、设置Intent并启动目标Activity的过程。通过实例代码展示了如何在Android应用中实现数据共享，便于开发者理解和应用。

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Android Bundle类 .

根据google官方的文档（http://developer.android.com/reference/android/os/Bundle.html）

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

[java] view plain copy print ?

Bundle mBundle = new Bundle();

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）

[java] view plain copy print ?

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

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

[cpp] view plain copy print ?

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

Intent intent = new Intent(); intent.setClass(TestBundle.this, Target.class); intent.putExtras(mBundle);完整代码如下：

android mainfest.xml如下：

[java] view plain copy print ?

<?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>

<?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：

[java] view plain copy print ?

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);
}
}

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

[java] view plain copy print ?

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);
}
}

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); Bundle bundle = getIntent().getExtras(); //得到传过来的bundle String data = bundle.getString("Data");//读出数据 setTitle(data); } }
布局文件：

main.xml

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<?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>

<?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

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<?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

[java] view plain copy print ?

<?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>

<?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：