无法关闭android eclipse上的所有活动

假设我有四个班级.每个班级都有一个按钮,可以从一个页面切换到另一个页面,工作正常.但是现在我试图通过点击最后一页的按钮关闭所有活动.我试过了它也只是关闭了最后一页.如何实现这个概念？

请找我的代码以供参考

Xit_demoActivity.java

public class Xit_demoActivity extends Activity {
/** Called when the activity is first created. */

Button btn1; 

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    btn1 = (Button)findViewById(R.id.button_1);
    btn1.setonClickListener(new View.OnClickListener() {

    public void onClick(View v) {
    Intent myIntent = new Intent(v.getContext(), Class1.class);
    startActivity(myIntent);
        }
    });

Class1.java

public class Class1 extends Activity 
{

Button btn1;

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.main1);

    btn1 = (Button)findViewById(R.id.button_2);
    btn1.setonClickListener(new View.OnClickListener() {

    public void onClick(View v) {
    Intent myIntent = new Intent(v.getContext(), Class2.class);
    startActivity(myIntent);
        }
    });

Class2.java

public class Class2 extends Activity 
{

Button btn1;

@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.main2);


    btn1 = (Button)findViewById(R.id.button_3);
    btn1.setonClickListener(new View.OnClickListener() {

    public void onClick(View v) {
    Intent myIntent = new Intent(v.getContext(), Class3.class);
    startActivity(myIntent);
        }
    });

Class3.java

public class Class3 extends Activity 
{
@Override
protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);
    setContentView(R.layout.main3);

    Button next = (Button) findViewById(R.id.button_4);
    next.setonClickListener(new View.OnClickListener() {

    public void onClick(View v) 
    {
        Intent intent = new Intent();
        setResult(RESULT_OK, intent);
        finish();
        }
    });

的Manifest.xml

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

<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="8" />

<application
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name" >
    <activity
        android:name=".Xit_demoActivity"
        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=".Class1"></activity>

    <activity
        android:name=".Class1"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN1" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity><activity android:name=".Class2"></activity>



    <activity
        android:name=".Class2"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN2" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity><activity android:name=".Class3"></activity>

    <activity
        android:name=".Class3"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN3" />
            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>


 </application>

</manifest>

谢谢你的时间！..

解决方法:

试试吧.考虑你的Class3.java是你的最后一个Activitiy而且,在下面使用的按钮下面代码 –

Intent intent = new Intent(currentActivity.this, Xitactivity.class); // instead of Xitactivity use your first activity
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
intent.putExtra("EXIT", true);
startActivity(intent);

而且,在你的Xit_demoActivity的onCreate()中使用下面的代码 –

if (getIntent().getBooleanExtra("EXIT", false)) {
    finish();
}

希望这可以帮助您退出所有活动.