Android - 自定义GridAdapter中的GetView()

时间:2018-01-17 20:52:32

标签: android xml gridview fragment adapter

我正在开发一个新的应用程序(第一个大项目),我面临着GridView自定义视图适配器的问题,在网络上寻求答案2小时后我仍无法解决它。

我的目标是在创建片段时动态地将Buttons放入GridLayout,在我显示我的代码之前我想说我在Fragments和Android本身非常新,所以我可能会错过一些愚蠢的东西。 / p>

问题是它只显示传递给构造函数的字符串数组中的2个随机按钮,我试图调试,问题似乎是在getView()方法中。

碎片onCreateView:

    @Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.fragment_tutor_signup_step_one, container, false);

    ButterKnife.bind(this, rootView);

    // professions
    addProfeesions(professionsList);

    gridViewButtonAdapter = new GridViewButtonAdapter(getContext(), professions);

    gridView.setAdapter(gridViewButtonAdapter);

    return rootView;
}

public void addProfeesions(String[] profession_list) {

    professions.clear();

    for(int i = 0; i < profession_list.length; i++) {

        professions.add(profession_list[i]);
    }
}

片段XML:

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/tutorSignupLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".activity.SignupStepOneActivity">

<TextView
    android:id="@+id/additionalInfoTextView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginEnd="8dp"
    android:layout_marginStart="8dp"
    android:layout_marginTop="16dp"
    android:text="@string/signup_step_one_under_welcome"
    android:textSize="16sp"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.123"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<ScrollView
    android:layout_width="0dp"
    android:layout_height="0dp"
    android:layout_marginTop="8dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="1.0"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/additionalInfoTextView"
    app:layout_constraintVertical_bias="0.0">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical">

        <TextView
            android:id="@+id/textView2"
            android:layout_width="match_parent"
            android:layout_height="39dp"
            android:gravity="center"
            android:text="Choose your profession" />

        <GridView
            android:id="@+id/gridView"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:gravity="center"
            android:numColumns="auto_fit"
            android:stretchMode="columnWidth" >

        </GridView>


    </LinearLayout>


</ScrollView>

我的自定义ViewAdapter:

public class GridViewButtonAdapter extends BaseAdapter {

private List<String> list;
private Context context;

public GridViewButtonAdapter(Context context, List<String> list) {

    this.context = context;
    this.list = list;
}

@Override
public int getCount() {
    return list.size();
}

@Override
public Object getItem(int i) {
    return null;
}

@Override
public long getItemId(int i) {
    return 0;
}

@Override
public View getView(int i, View view, ViewGroup viewGroup) {

    if(view == null) {

        LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        view = inflater.inflate(R.layout.row_grid, viewGroup, false);

    } else {

        LinearLayout linearLayout = view.findViewById(R.id.gridLinear);
        linearLayout.addView(addButton(list.get(i)));
    }

    return view;
}

private Button addButton(String text) {

    LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
    Button button = (Button) LayoutInflater.from(context).inflate(R.layout.button, null);

    button.setLayoutParams(params);
    button.setText(text);
    Log.i("INFO BUTTON", text);
    return button;

}

row_grid.XML(用于填充GridLayout单元格)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:id="@+id/gridLinear"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:orientation="vertical">


 </LinearLayout>

对于任何有关此问题的帮助,我都会非常感激,同时请继续排除故障,谢谢。

1 个答案:

答案 0 :(得分:0)

如上所述我已经解决了缺少按钮的问题,但现在我无法弄清楚如何删除gridView中项目之间的空格。

换句话说,我如何制作一个单元格来包装其内容?

GridVew:

        <GridView
        android:id="@+id/gridView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:numColumns="3" >

    </GridView>

row_grid.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/linearTest"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="vertical">

<Button
    android:id="@+id/buttonTest"
    style="@style/My.Button.One"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/custom_button_1"
    android:padding="3dp"
    android:text="Button"
    android:textSize="12sp"
    android:adjustViewBounds="true"  />

  </LinearLayout>

谢谢, 巴特