Android implements return key function

Record the operation history of user clicks, use stack data structure, frequently operate the top of the stack (add, obtain, delete), use LinkedList

Capture the user's return key operation, respond to the return key, and return to the previous interface

/**
 * Return key processing
 */
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if(keyCode==KeyEvent.KEYCODE_BACK){
boolean result=().goBack();
if(!result){
(, "Do not exit the application", 1).show();
}
return false;
}
return (keyCode, event);
}

//Operation history stackprivate LinkedList&lt;String&gt; HISTORY=new LinkedList&lt;String&gt;();
/**
 * Processing return key
 * @return
 */
public boolean goBack() {
//If it is empty, an exception will be thrownif(()&gt;0){
if(()==1){
return false;
}

();
if(()&gt;0){
String key=();
BaseView targetView=(key);
();
View child=();
(child);
(((), .left_to_right));
currentView=targetView;
return true;
}
}
return false;
}
/**
 * Loading interface
 */
public void loadView(Class&lt;? extends BaseView&gt; baseViewClass) {
BaseView baseView=null;
//Judge whether it existsString key=();
if((key)){
baseView=(key);
}else{
try {
Constructor&lt;? extends BaseView&gt; constructor;
constructor = ();
baseView=(());
} catch (Exception e) {
();
}
(key, baseView);
}
();
View child=();
(child);
(((), .left_to_right));
currentView=baseView;
//Put into the stack(key);
}

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