如何从历史回退堆栈中删除Activity自己

当用户在一个Activity中执行完任务，要向前切换到另一个Activity，并且不希望用户点击“返回”按钮再回到当前的Activity时，可以调用Activity类的finish()方法，把当前的Activity从该应用的回退堆栈中删除，finish()方法被调用，当前的Activity就会被销毁，用户不能够再按“返回”按钮回到这个Activity中。示例代码如下：

一．清单文件(AndroidManifest.xml)

<?xmlversion="1.0"encoding="utf-8"?>

<manifestxmlns:android="http://schemas.android.com/apk/res/android"

package="my.android.test"

android:versionCode="1"

android:versionName="1.0">

<application android:icon="@drawable/icon"android:label="@string/app_name">

<activity android:name=".Forwarding"

android:label="@string/app_name">

<intent-filter>

<actionandroid:name="android.intent.action.MAIN"/>

<categoryandroid:name="android.intent.category.LAUNCHER"/>

</intent-filter>

</activity>

<activity android:name=".ForwardTarget">

</activity>

</application>

<uses-sdk android:minSdkVersion="9"/>

</manifest>

二．字符资源定义（strings.xml）

<?xmlversion="1.0"encoding="utf-8"?>

<resources>

<string name="hello">Hello World, Forwarding!</string>

<string name="app_name">Forwarding</string>

<string name="activity_forwarding">App/Activity/Forwarding</string>

<string name="forwarding">Press the button to go forward to the next activity.This activity will stop, so you will no longer see it when going back.</string>

<string name="go">Go</string>

<string name="forward_target">Press back button and notice we don\'t see the previous activity.</string>

</resources>

三．布局定义（forwarding.xml、forward_target.xml）

Forwarding.xml

<?xmlversion="1.0"encoding="utf-8"?>

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:padding="4dip"

android:gravity="center_horizontal"

android:layout_width="match_parent"android:layout_height="match_parent">

<TextView

android:layout_width="match_parent"android:layout_height="wrap_content"

android:layout_weight="0"

android:paddingBottom="4dip"

android:text="@string/forwarding"/>

<Buttonandroid:id="@+id/go"

android:layout_width="wrap_content"android:layout_height="wrap_content"

android:text="@string/go">

<requestFocus />

</Button>

</LinearLayout>

forward_target.xml

<?xmlversion="1.0"encoding="utf-8"?>

<LinearLayoutxmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:padding="4dip"

android:gravity="center_horizontal"

android:layout_width="match_parent"android:layout_height="match_parent">

<TextView

android:layout_width="match_parent"android:layout_height="wrap_content"

android:layout_weight="0"

android:text="@string/forward_target"/>

</LinearLayout>

四．Activity类定义（Forwarding.java、ForwardTarget.java）

Frowarding.java

package my.android.test;

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

public class Forwarding extends Activity {
/** Activity被首次创建时调用这个方法*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.forwarding);
//从布局中查找go按钮，并给它设置点击事件监听器
Button goButton = (Button)findViewById(R.id.go);
goButton.setOnClickListener(mGoListener);

}

/** 实现OnClickListener接口，监听按钮的点击事件*/
private OnClickListener mGoListener = new OnClickListener(){
public void onClick(View v){
//声明Intent对象，并启动ForwardTarget Activity
Intent intent = new Intent();
intent.setClass(Forwarding.this, ForwardTarget.class);
startActivity(intent);
//从历史堆栈中删除当前Activity，用户点击“返回”按钮键时，不会再返回到这个Activity。
finish();
}
};
}

ForwardTarget.java

package my.android.test;

import android.app.Activity;

import android.os.Bundle;

publicclass ForwardTargetextends Activity {

@Override

protectedvoid onCreate(Bundle saveInstanceState){

super.onCreate(saveInstanceState);

setContentView(R.layout.forward_target);

}

}