APIDEMO TAB ACTIVITY 学习

1：Content by ID

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.android.apis.view;
import android.app.TabActivity;
import android.os.Bundle;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;
import android.view.LayoutInflater;
import android.view.View;
import com.example.android.apis.R;
/**
 * An example of tabs that uses labels ({@link TabSpec#setIndicator(CharSequence)})
 * for its indicators and views by id from a layout file ({@link TabSpec#setContent(int)}).
 */
public class Tabs1 extends TabActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        TabHost tabHost = getTabHost();
        
        LayoutInflater.from(this).inflate(R.layout.tabs1, tabHost.getTabContentView(), true);
        tabHost.addTab(tabHost.newTabSpec("tab1") 
                .setIndicator("tab10")//设置TAB描述
                .setContent(R.id.view1));//TAB 主内容
        tabHost.addTab(tabHost.newTabSpec("tab3")
                .setIndicator("tab20")
                .setContent(R.id.view2));
        tabHost.addTab(tabHost.newTabSpec("tab3")
                .setIndicator("tab30")
                .setContent(R.id.view3));
    }
}

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright (C) 2007 The Android Open Source Project
     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at
  
          http://www.apache.org/licenses/LICENSE-2.0
  
     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
-->
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TextView android:id="@+id/view1"
        android:background="@drawable/blue"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="@string/tabs_1_tab_1"/>
    <TextView android:id="@+id/view2"
        android:background="@drawable/red"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="@string/tabs_1_tab_2"/>
    <TextView android:id="@+id/view3"
        android:background="@drawable/green"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="@string/tabs_1_tab_3"/>
</FrameLayout>

2： content by Factory

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.android.apis.view;
import android.app.TabActivity;
import android.os.Bundle;
import android.widget.TabHost;
import android.widget.TextView;
import android.view.View;
import com.example.android.apis.R;
/**
 * Example of using a tab content factory for the content via {@link TabHost.TabSpec#setContent(android.widget.TabHost.TabContentFactory)}
 *
 * It also demonstrates using an icon on one of the tabs via {@link TabHost.TabSpec#setIndicator(CharSequence, android.graphics.drawable.Drawable)}
 *
 */
public class Tabs2 extends TabActivity implements TabHost.TabContentFactory {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        final TabHost tabHost = getTabHost();
        tabHost.addTab(tabHost.newTabSpec("tab1")
                .setIndicator("tab1", getResources().getDrawable(R.drawable.star_big_on)) //设置描述和图标
                .setContent(this));//设置content 为TabContentFactory接口实现，createTabContent方法中实现
        tabHost.addTab(tabHost.newTabSpec("tab2")
                .setIndicator("tab2")
                .setContent(this));
        tabHost.addTab(tabHost.newTabSpec("tab3")
                .setIndicator("tab3")
                .setContent(this));
    }
    /** {@inheritDoc} */
    public View createTabContent(String tag) {
        final TextView tv = new TextView(this);
        tv.setText("Content for tab with tag " + tag);
        return tv;
    }
}

3： Content by Intent

可以设置Activity为content

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.android.apis.view;
import android.app.TabActivity;
import android.os.Bundle;
import android.widget.TabHost;
import android.content.Intent;
/**
 * An example of tab content that launches an activity via {@link android.widget.TabHost.TabSpec#setContent(android.content.Intent)}
 */
public class Tabs3 extends TabActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        final TabHost tabHost = getTabHost();
        tabHost.addTab(tabHost.newTabSpec("tab1")
                .setIndicator("list")
                .setContent(new Intent(this, List1.class)));
        tabHost.addTab(tabHost.newTabSpec("tab2")
                .setIndicator("photo list")
                .setContent(new Intent(this, List8.class))); //启动一个Activity作为Content主体
        	
        
        // This tab sets the intent flag so that it is recreated each time
        // the tab is clicked.
        tabHost.addTab(tabHost.newTabSpec("tab3")
                .setIndicator("destroy")
                .setContent(new Intent(this, Controls2.class)
                        .addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)));//每次都重新启动一个Activity
    }
}