java - 从菜单中打开新 Activity

Question

我正在为 Android 编写应用程序，但遇到了一些问题。我有主要 Activity 和设置 Activity 。我想从主 Activity 菜单启动设置 Activity 。我有这段代码来执行此操作:

@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.menu_preferences:
        Intent j = new Intent(getApplicationContext(), SettingsActivity.class);
        startActivity(j);
        break;
    default:
        break;
    }
    return super.onOptionsItemSelected(item);
}

但是它不起作用。当我尝试时，我有 logcat:

Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@40a254c8

并且设置 Activity 未显示。我不知道该怎么办...

Answer 1

替换此行

return super.onOptionsItemSelected(item);

用这个

return true;