Android小例子（点击一个按钮，传递数据给另一个页面）

Android程序流程：

首先解析AndroidManifest.xml----à根据<application>标签显示应用程序图标和标签----à找到第一个Activity(根据包中的类名)，进行应用操作 ----à类中对R.java文件进行操作（其中包括布局文件，按钮等）

该例子的文件结构图如下：

AndroidManifest.xml（新建的Activity一定要在这里注册）

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="android.proper"

android:versionCode="1"

android:versionName="1.0">

<uses-sdk android:minSdkVersion="4" />

<application android:icon="@drawable/icon" android:label="@string/app_name">

<activity android:name=".Activity_01Activity"

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=".OtherActivity" android:label="@string/other"/>

</application>

</manifest>

Activity_01Activity.java

package android.proper;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.widget.Button;

public class Activity_01Activity extends Activity {

private Button myButton=null;

//一个Activity就是一个类，继承了Activity这个类

//需要复写onCreate方法

//每一个Activity方法都要在AndroidManifest.xml中进行配置。

//为每一个Activity添加控件

//通常一个Activity对应一个layout.main布局文件

/** Called when the activity is first created. */

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.main);

myButton=(Button)findViewById(R.id.myButton);

myButton.setText("我的第一个button"+"/n"+"按钮");

myButton.setOnClickListener(new MyButtonListener());

}

class MyButtonListener implements android.view.View.OnClickListener{

public void onClick(View v) {

// TODO Auto-generated method stub

Intent intent=new Intent();

//Intent可以在不同的应用程序的Activity发送数据

intent.putExtra("testIntent", "Robin");

intent.setClass(Activity_01Activity.this, OtherActivity.class);//从哪里跳到哪里

Activity_01Activity.this.startActivity(intent);

}

}

}

OtherActivity.java

package android.proper;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.widget.TextView;

public class OtherActivity extends Activity{

private TextView myTextView=null;

@Override

protected void onCreate(Bundle savedInstanceState) {

// TODO Auto-generated method stub

super.onCreate(savedInstanceState);

setContentView(R.layout.other);

Intent intent=getIntent();

String value=intent.getStringExtra("testIntent");

myTextView=(TextView)findViewById(R.id.myTestView);

myTextView.setText(value);

}

}

R.java

package android.proper;

public final class R {

public static final class attr {

}

public static final class drawable {

public static final int icon=0x7f020000;

}

public static final class id {

public static final int myButton=0x7f050000;

public static final int myTestView=0x7f050001;

}

public static final class layout {

public static final int main=0x7f030000;

public static final int other=0x7f030001;

}

public static final class string {

public static final int app_name=0x7f040001;

public static final int hello=0x7f040000;

public static final int other=0x7f040002;

}

}

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"

>

<Button

android:id="@+id/myButton"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

/>

</LinearLayout>

other.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:id="@+id/myTestView"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

/>

</LinearLayout>

string.xml

<?xml version="1.0" encoding="utf-8"?>

<resources>

<string name="hello">Hello World, Activity_01Activity!</string>

<string name="app_name">Activity_01</string>

<string name="other">otherActivity</string>

</resources>

结果如下图所示：