用ActivityGroup解决TabHost中多个Activity跳转问题

下面图片是测试程序的效果图

 

  

 

 

两个选项卡的实现

 

   布局文件  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">

    <TabHost xmlns:android="http://schemas.android.com/apk/res/android"
        android:id="@android:id/tabhost" android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <LinearLayout android:orientation="vertical"
            android:layout_width="fill_parent" android:layout_height="fill_parent">

            <TabWidget android:id="@android:id/tabs"
                android:layout_width="fill_parent" android:layout_height="wrap_content" />
            <FrameLayout android:id="@android:id/tabcontent"
                android:layout_width="fill_parent" android:layout_height="wrap_content"
                android:layout_weight="3">

            </FrameLayout>


        </LinearLayout>
    </TabHost>

</LinearLayout>

 

 

    Java代码实现  MainActivity.java

 

package hkp.test;

import android.app.TabActivity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TabHost;

public class MainActivity extends TabActivity {

    private  TabHost tabHost;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        tabHost = getTabHost();

        tabHost.addTab(tabHost.newTabSpec("tab1")
                .setIndicator("First")
                .setContent(new Intent(this,FirstGroupTab.class)));//第一个选项卡使用一个ActivityGroup
        tabHost.addTab(tabHost.newTabSpec("tab2")
                .setIndicator("Second")
                .setContent(new Intent(this, SecondTab.class)));//第二个选项卡是一个Activity

        tabHost.setCurrentTab(0);
    }

}

 

    使用 ActivityGroup的管理

 

package hkp.test;

import android.app.ActivityGroup;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.Window;

/**
 * @author HuangKaipeng [email protected]
 * 2011-10-5
 *
 */
public class FirstGroupTab extends ActivityGroup {

    /**
     * 一个静态的ActivityGroup变量，用于管理本Group中的Activity
     */
    public static ActivityGroup group;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);

        group = this;

    }

    @Override
    public void onBackPressed() {
        // TODO Auto-generated method stub
//      super.onBackPressed();
        //把后退事件交给子Activity处理
        group.getLocalActivityManager()
            .getCurrentActivity().onBackPressed();
    }

    @Override
    protected void onResume() {
        // TODO Auto-generated method stub
        super.onResume();
        //把界面切换放到onResume方法中是因为，从其他选项卡切换回来时，
        //调用搞得是onResume方法

        //要跳转的界面
        Intent intent = new Intent(this, FirstActivity.class).
                  addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        //把一个Activity转换成一个View
        Window w = group.getLocalActivityManager().startActivity("FirstActivity",intent);
        View view = w.getDecorView();
        //把View添加大ActivityGroup中
        group.setContentView(view);
    }

 

    ActivityGroup中的第一个Activity

 

 

package hkp.test;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.View.OnClickListener;
import android.widget.Button;

/**
 * @author HuangKaipeng [email protected]
 * 2011-10-5
 *
 */
public class FirstActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        setContentView(R.layout.first_activity);

        //跳转到第二个界面
        Button btn = (Button) findViewById(R.id.btn);
        btn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                Intent intent = new Intent(FirstActivity.this, SecondActivity.class).
                          addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                //把一个Activity转换成一个View
                Window w = FirstGroupTab.group.getLocalActivityManager()
                        .startActivity("SecondActivity",intent);
                View view = w.getDecorView();
                //把View添加大ActivityGroup中
                FirstGroupTab.group.setContentView(view);
            }
        });
    }

}

 

 

    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:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="这个是ActivityGroup中的第一个界面！"
    />
    <Button android:id="@+id/btn"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="跳转到本组中的另一个Activity中"/>
</LinearLayout>