[转载]利用Bundle实现Android Activity间消息的传递

程序的效果是活动A向B跳转的同时发送一字符串，B读出字符串。

先在AndroidManifest.xml中定义一个新的Activity，target：

Xml代码


<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ray.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="3" />
</manifest>

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.ray.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="3" />
</manifest>

第一个活动的代码如下：

Java代码


package com.ray.test; import android.app.Activity; import android.content.Intent; import android.os.Bundle; import android.view.MotionEvent; public class TestBundle extends Activity { public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); } public boolean onTouchEvent(MotionEvent event) { Intent intent = new Intent(); intent.setClass(TestBundle.this, Target.class); Bundle mBundle = new Bundle(); mBundle.putString("Data", "ray'blog");//压入数据 intent.putExtras(mBundle); startActivity(intent); finish(); return super.onTouchEvent(event); } }

package com.ray.test;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.MotionEvent;

public class TestBundle extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}

public boolean onTouchEvent(MotionEvent event) {
Intent intent = new Intent();
intent.setClass(TestBundle.this, Target.class);
Bundle mBundle = new Bundle();
mBundle.putString("Data", "ray'blog");//压入数据
intent.putExtras(mBundle);
startActivity(intent);
finish();
return super.onTouchEvent(event);
}
}

将要跳转到的活动代码：

Java代码


package com.ray.test;

import android.app.Activity;
import android.os.Bundle;

public class Target extends Activity{

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Bundle bundle = getIntent().getExtras();
String data=bundle.getString("Data");//读出数据
setTitle(data);
}
}

如果要从Target往TestBundle回传数据/信息, 可以在TestBundle里面:
startActivityForResult(intent, 1333); // 1333是request code

然后在Target里面, 回传的时候:
Intent data = new Data();
data.putExtra("msg", "my message");
setResult(RESULT_OK, data);
finish();

在TestBundle里出来传回来的数据/信息:
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
String msg = data.getExtras.getString("msg");
// ...
}