小编Top*_*Cat的帖子

我有一个包含多个片段的活动.Activity最初有片段,里面有两个按钮.单击此按钮后,我必须用新片段替换片段.每个片段都有各种小部件,并将当前片段替换为各种事件.

这是我的问题.我怎样才能做到这一点.

建议我的想法.

我试图获得textview的顶部和左边缘,我给了硬编码的边距.

为什么我这样做？因为我想循环遍历所有的文本视图,所以我放置在这个文本视图之下,这样我就可以在这些精确的边距上编程添加radiobutton组.

textView[0] = new TextView(context);
relativeLayoutParams = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
textView[0].setId(1); // changed id from 0 to 1
textView[0].setText(naam[0].toUpperCase());
relativeLayoutParams.setMargins(24, 39, 0, 0);
int tyo = relativeLayoutParams.getTop(); //Trying to get top margins.

我的完整代码在这里给出.但没有显示活动.添加clickListener()时显示空指针异常.

我如何访问使用片段膨胀的按钮

//无法添加完整代码.显示添加更多细节.//

 public class Activity extends Activity{

        private static final String KEY_SUCCESS="success";


        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_welcome);
            FragmentManager fragmentManager=getFragmentManager();
            FragmentTransaction transaction=fragmentManager.beginTransaction();
            Fragment fragment=new PlaceholderFragment();
            transaction.add(R.id.container,fragment);
            transaction.addToBackStack("welcome");
            transaction.commit();

            }



        /**
         * A placeholder fragment containing a simple view.
         */
        public static class PlaceholderFragment extends Fragment {
           Button loginButton;

            private String userNameString;
            private String passwordString;

            public PlaceholderFragment() {
            }

            @Override
            public View onCreateView(LayoutInflater inflater, ViewGroup container,
                                     Bundle savedInstanceState) {
                View rootView;
                rootView = inflater.inflate(R.layout.fragment_welcome, container, false);

                try{
                    loginButton= …

我试图从sqlite中的表中获取所有项目,并需要在列表视图中显示它.

这是我获取物品的代码

public List<MenuData> getMenuItem(){
    SQLiteDatabase db;
    Cursor cursor=null;
    List<MenuData> menuList = new ArrayList<MenuData>();
    db=getReadableDatabase();
    String query ="SELECT * from "+TABLE_NAME_MENU;
    try{
    cursor = db.rawQuery (query, null );
    }
    catch (NullPointerException e){
        Log.e("Error","Null Pointer Exception");
    }

   if ( cursor.moveToFirst()) {
        do {
            MenuData menuData= new MenuData();
            menuData.setKEY_ITEM_NAME(cursor.getString(cursor.getColumnIndex(KEY_ITEM_NAME)));
           menuData.setKEY_ITEM_CATEGORY(cursor.getString(cursor.getColumnIndex(KEY_ITEM_CATEGORY)));
            menuData.setKEY_ITEM_CONTENTS(cursor.getString(cursor.getColumnIndex(KEY_ITEM_CONTENTS)));
            menuData.setKEY_ITEM_TYPE(cursor.getString(cursor.getColumnIndex(KEY_ITEM_TYPE)));
            menuData.setKEY_PRICE(cursor.getString(cursor.getColumnIndex(KEY_PRICE)));
            menuList.add(menuData);
        } while (cursor.moveToNext());
    }
   return menuList;

}

我的问题是我得到了表格最后一行的结果menuList,它在表格中有相同的行数.因此列表视图具有所有相同的项目.

请帮我!首先请遵循此算法:

btn_set1单击1- ,其功能正在执行.

2- btn_set2被点击时,"文本1"是的setText编入"+"!

为什么？？？请帮帮我,我该怎样解决这个问题？谢谢.

 public void onClick(View view) {
    switch (view.getId()){
        //time picker pannel
        case R.id.btn_set1:
            text1.setText(aTime);
            intent1 = new Intent(this, alarmService.class);
            intent1.putExtra("rq1", req_code);
            intent1.putExtra("alarm_time", alarm_time1);
            startService(intent1);
            alinear.setAnimation(animLeft);
            Linear.setVisibility(View.GONE);
            text2.setVisibility(View.VISIBLE);
            break;

        case R.id.btn_set2:
            text2.setText(aTime);
            intent2 = new Intent(this, alarmService.class);
            intent2.putExtra("rq2", req_code);
            intent2.putExtra("alarm_time", alarm_time1);
            startService(intent2);
            LLinear.setAnimation(animLeft);
            Linear.setVisibility(View.GONE);

        case R.id.btn_cancle1:
            Linear.setAnimation(animLeft);
            Linear.setVisibility(View.GONE);
            cancel_one(text1);
            break;

        case R.id.btn_cancle2:
            Linear.setAnimation(animLeft);
            Linear.setVisibility(View.GONE);
            cancel_one(text2);
            break;
    }
}
private void cancel_one(TextView textView) {
    if(intent1 != null)
        stopService(intent1);

    if(intent2 != null)
        stopService(intent2);

    textView.setText("+");
}