AndroidSDK开发范例大全__手机界面的切换(setContentView的应用)__调用另一个Activity(Intent的使用)

 

手机界面的切换_setContentView的应用

res/layout/main.xml:

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/black"
    >
    <TextView
        android:id="@+id/text1"
        android:textSize="24sp"
        android:layout_width="186px"
        android:layout_height="29px"
        android:layout_x="70px"
        android:layout_y="32px"
        android:text="@string/layout1"
         />
    <Button 
        android:id="@+id/button1"
        android:layout_width="118px"
        android:layout_height="wrap_content"
        android:layout_x="100px"
        android:layout_y="82px"
        android:text="Go to Layout2"
        />
</AbsoluteLayout>

 

在res/layout中新建一个布局文件mylayout.xml

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@drawable/white"
    >
    <TextView
        android:id="@+id/text2"
        android:textSize="24sp"
        android:layout_width="186px"
        android:layout_height="29px"
        android:layout_x="70px"
        android:layout_y="32px"
        android:text="@string/layout2"
         />
    <Button 
        android:id="@+id/button2"
        android:layout_width="118px"
        android:layout_height="wrap_content"
        android:layout_x="100px"
        android:layout_y="82px"
        android:text="Go to Layout1"
        />
</AbsoluteLayout>

Test01Activity.java:

package xiacl.test;

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

public class Test01Activity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        /*加载main.xml Layout*/
        setContentView(R.layout.main);
        
        /*以findViewById()取得Button对象，并添加onClickListener*/
        Button b1=(Button)findViewById(R.id.button1);
        b1.setOnClickListener(new Button.OnClickListener()
        {
            @Override
            public void onClick(View v){
                jumpToLayout2();
            }
        });
    }
    /*方法jumpToLayout2:将layout由main.xml切换成mylayout.xml*/
    public void jumpToLayout2()
    {
        /*将layout改成mylayout.xml 这也是功能实现的代码*/
        setContentView(R.layout.mylayout);
        Button b2=(Button)findViewById(R.id.button2);
        b2.setOnClickListener(new Button.OnClickListener()
        {
            @Override
            public void onClick(View v){
                jumpToLayout1();
            }
        });
    }
    /*方法jumpToLayout1:将layout由mylayout.xml切换成main.xml*/
    public void jumpToLayout1()
    {
        /*将layout改回main.xml*/
        setContentView(R.layout.main);
        Button b1=(Button)findViewById(R.id.button1);
        b1.setOnClickListener(new Button.OnClickListener()
        {
            @Override
            public void onClick(View v){
                jumpToLayout2();
            }
        });
    }
}

 

调用另一个Activity_Intent的使用

 Test01Activity.java:

package xiacl.test;
/*import 相关class*/
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.Button;
import android.content.Intent;

public class Test01Activity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        /*加载main.xml Layout*/
        setContentView(R.layout.main);
        
        /*以findViewById()取得Button对象，并添加onClickListener*/
        Button b1=(Button)findViewById(R.id.button1);
        b1.setOnClickListener(new Button.OnClickListener()
        {
            @Override
            public void onClick(View v){
                /*new一个Intent对象，并指定要启动的class*/
                Intent intent=new Intent();
                intent.setClass(Test01Activity.this, Test02.class);
                
                /*调用一个新的Activity*/
                startActivity(intent);
                /*关闭原本的Activity*/
                Test01Activity.this.finish();
            }
        });
    }
}

在src/xiacl.test里新建一个Test02.java：

package xiacl.test;
/*import 相关class*/
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;
import android.widget.Button;
import android.content.Intent;

public class Test02 extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        /*加载mylayout.xml Layout*/
        setContentView(R.layout.mylayout);
        
        /*以findViewById()取得Button对象，并添加onClickListener*/
        Button b2=(Button)findViewById(R.id.button2);
        b2.setOnClickListener(new Button.OnClickListener()
        {
            @Override
            public void onClick(View v){
                /*new一个Intent对象，并指定要启动的class*/
                Intent intent=new Intent();
                intent.setClass(Test02.this, Test01Activity.class);
                
                /*调用一个新的Activity*/
                startActivity(intent);
                /*关闭原本的Activity*/
                Test02.this.finish();
            }
        });
    }
}

最后 在系统中新添加Activity时,必须在AndroidManifest.xml里定义一个新的activity。
AndroidManifest.xml：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="xiacl.test"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="4" />

    <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <activity
            android:name=".Test01Activity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        /添加一个新的Activity Test02*/
        <activity android:name="Test02"></activity>
    </application>
</manifest>