退出多个活动
1.使用广播。
写个基类活动，里面注册广播。
/**
* 去除标题
*/
public class BasicActivity extends Activity {
protected BroadcastReceiver broadcastrec = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// TODO Auto-generated method stub
finish();
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
// 去除标题栏
requestWindowFeature(Window.FEATURE_NO_TITLE);
// 在当前的activity中注册广播
IntentFilter filter = new IntentFilter();
filter.addAction("ExitApp");
this.registerReceiver(this.broadcastrec, filter);
}
protected void myExit() {
Intent exitintent = new Intent();
exitintent.setAction("ExitApp");
this.sendBroadcast(exitintent);
super.finish();
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
this.unregisterReceiver(this.broadcastrec);
}
}
在要退出的时候，调用该方法：
this.myExit();
2.使用堆栈
1.设定第一个页面的启动模式为，singletask。
<activity
android:name="cn.someactivity.FirstAcy"
android:label="@string/app_name"
android:launchMode="singleTask" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
2.添加3个页面：
布局就一个button：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical" >
<Button
android:id="@+id/btn_back"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="返回" />
</LinearLayout>
页面1：
public class FirstAcy extends Activity implements OnClickListener {
private Button back;
private boolean isExit = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.acy_someacy);
back = (Button) findViewById(R.id.btn_back);
back.setText("跳转到第2个页面");
back.setOnClickListener(this);
}
/**
* 第二次跳转到该页面时，执行该方法
*/
@Override
protected void onRestart() {
// TODO Auto-generated method stub
super.onRestart();
if (isExit == true) {
this.finish();
}
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent;
if (v == back) {
intent = new Intent(this, SecondAcy.class);
startActivity(intent);
isExit = true;
}
}
}
页面2：
public class SecondAcy extends Activity implements OnClickListener {
private Button back;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.acy_someacy);
back = (Button) findViewById(R.id.btn_back);
back.setText("跳转到第3个页面");
back.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent;
if (v == back) {
intent = new Intent(this, ThirdAcy.class);
startActivity(intent);
}
}
}
页面3：
public class ThirdAcy extends Activity implements OnClickListener {
private Button back;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.acy_someacy);
back = (Button) findViewById(R.id.btn_back);
back.setText("退出所有界面");
back.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent;
if (v == back) {
intent = new Intent(this, FirstAcy.class);
startActivity(intent);
}
}
}
注意：
singletask解释：（本人的翻译水平一般，自己看官方的解释吧）
The system creates the activity at the root of a new task and routes the intent to it. However, if an instance of the activity already exists, the system routes the intent to existing instance through a call to its onNewIntent() method, rather than creating a new one.
3.使用链表：
重写application，因为android就一个application，所以可以将所有加入的活动放到里面，要退出的时候，就在里面直接kill掉。
1.重写application：
public class MyApplication extends Application {
private List acyList = new LinkedList();
/**
* 添加活动
*/
public void addAcy(Activity acy) {
acyList.add(acy);
}
/**
* 退出所有的活动
*/
public void exitAcy() {
Iterator iter = acyList.iterator();
while (iter.hasNext()) {
((Activity) iter.next()).finish();
}
}
}
2.添加活动到链表中：
public class FirstAcy extends Activity implements OnClickListener {
private Button back;
private boolean isExit = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.acy_someacy);
// 将该活动添加到链表中
((MyApplication) this.getApplication()).addAcy(this);
back = (Button) findViewById(R.id.btn_back);
back.setText("跳转到第2个页面");
back.setOnClickListener(this);
}
/**
* 第二次跳转到该页面时，执行该方法
*/
@Override
protected void onRestart() {
// TODO Auto-generated method stub
super.onRestart();
if (isExit == true) {
this.finish();
}
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent;
if (v == back) {
intent = new Intent(this, SecondAcy.class);
startActivity(intent);
isExit = true;
}
}
}
3.要退出的时候，调用退出方法：
public class ThirdAcy extends Activity implements OnClickListener {
private Button back;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.acy_someacy);
((MyApplication) this.getApplication()).addAcy(this);
back = (Button) findViewById(R.id.btn_back);
back.setText("退出所有界面");
back.setOnClickListener(this);
}
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
Intent intent;
if (v == back) {
// 退出所有的活动
((MyApplication) this.getApplication()).exitAcy();
}
}
}
注意：
这种方法，我看到网上的做法是，把application写成单例模式，这里我改了下，因为我觉得没必要写成单例，android就一个application。
其实这种方法，还可以再改良下。写一个基类活动，因为一般不会重写onstart(),onresume()方法，你在这里面写添加活动到链表，就可以不在子类中重写了。