新建一个Android项目，代码如下：
main.xml
[html] <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">"
<TextView android:id="@+id/textView"
android:text="点击按钮to Activity2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<Button android:id="@+id/button"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">"
<TextView android:id="@+id/textView"
android:text="点击按钮to Activity2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<Button android:id="@+id/button"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</LinearLayout>HelloWorldActivity.java
[java] public class HelloWorldActivity extends Activity implements OnClickListener{
private Button button;
/*继承Activity，必须实现onCreate方法
* 每一个Activity都要在AndroidManifest.xml中注册，
* */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
button=(Button)findViewById(R.id.button);
button.setText("My Button");
button.setOnClickListener(this);
}
public void onClick(View v) {
Intent intent=new Intent();
intent.setClass(HelloWorldActivity.this, Activity2.class);
//启动Activity2
HelloWorldActivity.this.startActivity(intent);
}
}
public class HelloWorldActivity extends Activity implements OnClickListener{
private Button button;
/*继承Activity，必须实现onCreate方法
* 每一个Activity都要在AndroidManifest.xml中注册，
* */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
button=(Button)findViewById(R.id.button);
button.setText("My Button");
button.setOnClickListener(this);
}
public void onClick(View v) {
Intent intent=new Intent();
intent.setClass(HelloWorldActivity.this, Activity2.class);
//启动Activity2
HelloWorldActivity.this.startActivity(intent);
}
}
新建一个类Activity2：
Activity2.xml
[html] <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="activy2"/>
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<TextView android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="activy2"/>
</LinearLayout>Activity2.java
[java] public class Activity2 extends Activity{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity2);
}
}
public class Activity2 extends Activity{
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity2);
}
}
在AndroidManifest.xml中注册Acivity2:
[html] <activity android:name=".Activity2"
android:label="activity2" />
<activity android:name=".Activity2"
android:label="activity2" />
运行效果如下，按返回又会回到HelloWorldActivity，
摘自柒
