Android 学习笔记（三）：Activity 之间跳转

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，

摘自柒尐狐的专栏

补充：移动开发 , Android ,