android 开发之Activity切换

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"    ><TextView      android:layout_width="fill_parent"     android:layout_height="wrap_content"     android:text="@string/hello"    /><Button     android:id="@+id/btnNextView"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="下一个Activity"/><Button     android:id="@+id/btn_exit"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="关闭"/></LinearLayout>

second_activity.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="@string/hello"    /><Button     android:id="@+id/btn_back"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="上一个activity"/><Button     android:id="@+id/btn_close"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="关闭"/></LinearLayout>

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"      package="com.esri.arcgis.sample"      android:versionCode="1"      android:versionName="1.0">    <uses-sdk android:minSdkVersion="7" />    <application android:icon="@drawable/icon" android:label="@string/app_name">        <activity android:name=".ActivityChange"                  android:label="@string/app_name">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity             android:name="ActivitySecond"        />    </application></manifest>

ActivityChange.java

package com.esri.arcgis.sample;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class ActivityChange extends Activity {    private Button btn;    private Button btnClose;        @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        btn=(Button)findViewById(R.id.btnNextView);                btn.setOnClickListener(new OnClickListener()        {            public void onClick(View v)            {                Intent itent=new Intent();                itent.setClass(ActivityChange.this, ActivitySecond.class);                startActivity(itent);                ActivityChange.this.finish();            }        });                btnClose=(Button)findViewById(R.id.btn_exit);        btnClose.setOnClickListener(new View.OnClickListener()        {            public void onClick(View v)            {                finish();            }        });    }}

ActivitySecond.java

package com.esri.arcgis.sample;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.widget.Button;public class ActivitySecond extends Activity { private Button btn2;    private Button btnClose;    @Override    protected void onCreate(Bundle savedInstanceState)    {        super.onCreate(savedInstanceState);        setContentView(R.layout.second_activity);        btn2 = (Button) findViewById(R.id.btn_back);        btn2.setOnClickListener(new View.OnClickListener()        {            public void onClick(View v)            {                Intent intent = new Intent();                intent.setClass(ActivitySecond.this, ActivityChange.class);                startActivity(intent);                //如果不关闭当前的会出现好多个页面                ActivitySecond.this.finish();            }        });        btnClose = (Button) findViewById(R.id.btn_close);        btnClose.setOnClickListener(new View.OnClickListener()        {            public void onClick(View v)            {                finish();            }        });    }}

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