根據google官方的文檔(http://developer.android.com/reference/android/os/Bundle.html)
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)新建一個bundle類
Bundle mBundle = new Bundle();
(2)bundle類中加入數據(key -value的形式,另一個activity裏面取數據的時候,就要用到key,找出對應的value)
mBundle.putString("Data", "data from TestBundle");
(3)新建一個intent對象,並將該bundle加入這個intent對象
Intent intent = new Intent();
intent.setClass(TestBundle.this, Target.class);
intent.putExtras(mBundle);
完整代碼如下:
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>
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");//壓入數據
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");//讀出數據
setTitle(data);
}
}
佈局文件:
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">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: