Activity的创建和使用
Activity：
1：创建一个类继承Activity或者它的子类
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Button button=(Button)findViewById(R.id.button1);//获取按钮
button.setOnClickListener(new OnClickListener(){//进行监听
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent(MainActivity.this,DetailActivity.class);//创建Intent对象
startActivity(intent);//启动Activity
}
});
}
2：设置布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".DetailActivity" >
<TextView
android:id="@+id/textView2"
android:layout_width="129dp"
android:layout_height="53dp"
android:text="@string/detail" />
<Button
android:id="@+id/button2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/bu" />
</LinearLayout>
3：重写继承类的方法
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.detail);//设置布局文件
Button button=(Button)findViewById(R.id.button2);//获取关闭按钮
button.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();//关闭当前的Activity
}
});
}
4：在主活动中创建Intent对象并开启Activity
setContentView(R.layout.main);
Button button=(Button)findViewById(R.id.button1);//获取按钮
button.setOnClickListener(new OnClickListener(){//进行监听
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent=new Intent(MainActivity.this,DetailActivity.class);//创建Intent对象
startActivity(intent);//启动Activity
}
});
5：在AndroidManifest.xml文件中配置你所写类的信息
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.org.aui"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.org.aui.MainActivity"
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:icon="@drawable/p1"
android:name=".DetailActivity"
android:label="@string/lab"
>
</activity>
</application>
</manifest>
