ActivityGroup解决TabHost中多个Activity的跳转

最近在做一个程序，刚开始没考虑全，就用TabHost做了，后来才发现程序中，需要在一个TabHost内实现多个Activity的跳转，网上搜了一翻，有人建议把TabHost改成Button，然后每个Activity中都处理加入的Button，这样是可以解决问题，但是修改起来很繁琐，所以还是继续寻找替代方法。在网上搜到了《使用ActivityGroup来切换Activity和Layout》一文，但是用在我的程序中还需要有大的改动，所以索性我就自己写了个测试例子，不错，成功了，拿出来和大家分享一下，希望对大家有帮助！

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代码

<?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>

<?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);
}

}

[java] view plain copy print ?

 

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);
}

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);
    }

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);
}
});
}

}

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>

[xml] view plain copy print ?

 

 

？？ActivityGroup中使用Dialog出错的解决方式：getParent()

        AlertDialog.Builder builder = new AlertDialog.Builder(SecondActivity.this.getParent());