Question

我正在使用GridView并尝试切换每个网格项中文本视图的可见性。我正在使用自定义适配器并已实现相关代码并更改了android:visibility。

我在这里缺少什么？任何帮助将不胜感激。 :)

以下是我的代码的相关部分：

MyAdapter.java

public class MyAdapter extends BaseAdapter {
Context context;
ArrayList<Players> playerList;
private static LayoutInflater inflater = null;

public MyAdapter(Context context, ArrayList<Players> playerList){
    this.context = context;
    this.playerList = playerList;
    inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}


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

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

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    if (convertView == null)
        convertView = inflater.inflate(R.layout.layout_grid_item, null);

    TextView idTextView = (TextView) convertView.findViewById(R.id.tv_player_id);
    TextView nameTextView = (TextView) convertView.findViewById(R.id.tv_player_name);
    TextView roleTextView = (TextView) convertView.findViewById(R.id.tv_player_role);

    Players p = new Players();
    p = playerList.get(position);
    idTextView.setText("ID " + String.valueOf(p.getId()));
    nameTextView.setText("Name " + String.valueOf(p.getName()));
    roleTextView.setText("Role " + String.valueOf(p.getRole()));
    toggleView(roleTextView);



    return convertView;
}

public void toggleView(View view){
    if(view.getVisibility() == View.INVISIBLE)
        view.setVisibility(View.VISIBLE);
    else if(view.getVisibility() == View.VISIBLE)
        view.setVisibility(View.INVISIBLE);


}

}

layout_grid_item.xml

    <TextView
    android:id="@+id/tv_player_role"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAlignment="center"
    android:visibility="gone"
    android:text="role" />

fragment_viewroles.xml （网格视图）

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.tuss.mafia.GameActivity" >

<GridView
    android:id="@+id/gv_players"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:numColumns="auto_fit"
    android:stretchMode="columnWidth"
    android:columnWidth="150dp"
    android:horizontalSpacing="10dp"
    android:verticalSpacing="10dp"
    android:gravity="center" >
</GridView>

</RelativeLayout>

Answer 1

在您的xml集中，可点击为真

<TextView
  android:onClick="onClick"
  android:clickable="true" 
  />

使用此方法

public void toggleView(View view){
    if(view.getVisibility()==View.INVISIBLE)
        view.setVisibility(View.VISIBLE);
    else if(view.getVisibility()==View.VISIBLE)
        view.setVisibility(View.INVISIBLE);
}

并将其称为

toggleView(roleTextView);

最终产品

 @Override
public View getView(int position, View convertView, ViewGroup parent) {
    if (convertView == null)
        convertView = inflater.inflate(R.layout.layout_grid_item, null);

    TextView idTextView = (TextView) convertView.findViewById(R.id.tv_player_id);
    TextView nameTextView = (TextView) convertView.findViewById(R.id.tv_player_name);
    TextView roleTextView = (TextView) convertView.findViewById(R.id.tv_player_role);

    Players p = new Players();
    p = playerList.get(position);
    idTextView.setText("ID " + String.valueOf(p.getId()));
    nameTextView.setText("Name " + String.valueOf(p.getName()));
    roleTextView.setText("Role " + String.valueOf(p.getRole()));


//If you want to show text by default
roleTextView.setVisibility(View.VISIBLE);

//If you want to hide text by default
roleTextView.setVisibility(View.INVISIBLE);

roleTextView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                toggleView(view);
            }
        });    


    return convertView;
}

public void toggleView(View view){
    if(view.getVisibility() == View.INVISIBLE)
        view.setVisibility(View.VISIBLE);
    else if(view.getVisibility() == View.VISIBLE)
        view.setVisibility(View.INVISIBLE);


}

Answer 2

if (R.id.tv_player_role == View.VISIBLE) {}

这是错的你需要用isShown()方法

来做

if(roleTextView.isShown()){
//it is visible so do something
} 
else {
//it is invisible
}

或使用view.getVisibility()

Answer 3

34 + 1 + 1 +1 + 5 = 42

的public void onClick(View v)方法内部

View.OnClickListener

另请注意if (v.getVisibility() == View.VISIBLE)可见性在XML中设置为roleTextView，因此如果您不按代码切换，则无法在屏幕上点击任何内容（gone是不够的，或者你切到很多代码）...

使用setText获得更好的效果，如果需要，可以像其他人建议的那样实施inflater.inflate(R.layout.layout_grid_item, parent, false);模式

Answer 4

首先始终使用List和Grid的View Holder模式。它减少了滚动期间有关视图加载的大量问题。

现在针对您的问题，您必须保持隐藏文本视图的维护索引，而您还没有隐藏文本视图。因此，当网格滚动时，检查位置，然后决定天气以显示文本视图。查看本教程以存储每行的索引（仅供参考） - http://www.androprogrammer.com/2013/10/list-view-with-check-box-using-custom.html

在gridview中切换文本视图可见性

4 个答案: