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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：
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