我对Android开发非常陌生。哪里声明onOptionsItemSelected全球使用?
在我MainActivity.java
文件,我已经声明的onOptionsItemSelected(MenuItem menu)
方法,它允许用户将当前页面MainActivity.java
和另一页我创建了名为Settings.java
之间跳转。
当用户转到Settings.java
页面,并且他们点击菜单中的Home
选项时,没有任何反应。我知道这是因为onOptionsItemSelected(MenuItem menu)
仅在MainActivity.java
类中定义,而不在Settings.java
类中定义。
我现在通过将onOptionsItemSelected(MenuItem menu)
从MainActivity.java
复制到Settings.java
来克服这个问题。但这是非常多余的。
我应该在哪里声明可以在不同类中重用的方法?
MainActivity.java
public class MainActivity extends Activity {
...
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_settings:
showMsg("Settings Clicked");
this.startActivity(new Intent(this, Settings.class));
return true;
case R.id.action_home:
showMsg("Home clicked");
this.startActivity(new Intent(this, MainActivity.class));
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private void showMsg(String msg) {
Toast toast = Toast.makeText(this.getBaseContext(), msg, Toast.LENGTH_LONG);
toast.show();
}
}
Settings.java
public class Settings extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.settings);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_settings:
this.startActivity(new Intent(this, Settings.class));
return true;
case R.id.action_home:
this.startActivity(new Intent(this, MainActivity.class));
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
谢谢。我结束了使用'BaseActivity'选项。我会在不久的将来看看碎片。 – FilmiHero 2013-03-27 18:23:31