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：