一个项目只使用一个Activity初探

提供一个简单案例:

1,新建一个项目

修改和添加三个xml文件:main.xml,item1.xml,item2.xml

a) main.xml

<?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" >

    <LinearLayout
        android:id="@+id/content"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:gravity="center_vertical|center_horizontal" >
    </LinearLayout>

    <Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="Change" />

</LinearLayout>

b) item1.xml

 

<?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/tv1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="1111111111111111111111111111111111" />
</LinearLayout>

c) item2.xml

 

<?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/tv2"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:text="222222222222222222222222222222222222" />
</LinearLayout>

 

修改MainActivity代码:

package com.bison.xxxxxxxxxxxxx;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.LinearLayout;

public class MainActivity extends Activity implements OnClickListener {
    LinearLayout content;
    Button btn;
    LinearLayout item1, item2;
    boolean isChange = false;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        // 初始化控件
        content = (LinearLayout) this.findViewById(R.id.content);
        btn = (Button) this.findViewById(R.id.button1);
        btn.setOnClickListener(this);
        // 加载item1
        initItem1();
    }

    private void initItem1() {
        item1 = (LinearLayout) LinearLayout.inflate(this, R.layout.item1, null);
        content.addView(item1);
    }

    private void initItem2() {
        item2 = (LinearLayout) LinearLayout.inflate(this, R.layout.item2, null);
        content.addView(item2);
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.button1:
            isChange = !isChange;
            if (isChange) {
                content.removeView(item1);
                // 加载item2
                initItem2();
            } else {
                content.removeView(item2);
                initItem1();
            }
            break;
        }
    }

}

 

PS:如果多个Activity具有相同的Header和Footer,则可以考虑使用这种方法来写.

分享到：