Android Action Bar 加入Back鍵

在Action Bar加入Back鍵或者其他功能, 看看效果.

[java] 
/*顯示App icon左側的back鍵*/ 
ActionBar actionBar = getActionBar(); 
actionBar.setDisplayHomeAsUpEnabled(true); 

/*顯示App icon左側的back鍵*/
ActionBar actionBar = getActionBar();
actionBar.setDisplayHomeAsUpEnabled(true);[java] view plaincopyprint?
@Override 
public boolean onOptionsItemSelected(MenuItem item) { 
     switch (item.getItemId()) { 
        case android.R.id.home: 
            this.finish(); 
        default: 
            return super.onOptionsItemSelected(item); 
    } 
} 

 @Override
 public boolean onOptionsItemSelected(MenuItem item) {
   switch (item.getItemId()) {
         case android.R.id.home:
          this.finish();
         default:
             return super.onOptionsItemSelected(item);
     }
 }