android - Android偏好总结。如何在摘要中设置 3 行？

Question

首选项摘要仅允许 2 行。如果我想在摘要中显示 3 行或更多行。我能怎么做 ？

Answer 1

Preference你可以通过扩展任何现有的偏好来创建你的类：

public class LongSummaryCheckboxPreference extends CheckboxPreference
{
    public LongSummaryCheckboxPreference(Context ctx, AttributeSet attrs, int defStyle)
    {
        super(ctx, attrs, defStyle);        
    }

    public LongSummaryCheckboxPreference(Context ctx, AttributeSet attrs)
    {
        super(ctx, attrs);  
    }

    @Override
    protected void onBindView(View view)
    {       
        super.onBindView(view);

        TextView summary= (TextView)view.findViewById(android.R.id.summary);
        summary.setMaxLines(3);
    }       
}

然后在preferences.xml：

 <com.your.package.name.LongSummaryCheckBoxPreference 
    android:key="@string/key"
    android:title="@string/title"
    android:summary="@string/summary" 
    ... />

缺点是您需要将需要 3 行摘要的所有首选项类型子类化。

Answer 2

使用androidx.preference.PreferenceCategory我得到了类似的东西：

爪哇：

public class LongSummaryPreferenceCategory extends PreferenceCategory {

    public LongSummaryPreferenceCategory(Context ctx, AttributeSet attrs, int defStyle) {
        super(ctx, attrs, defStyle);
    }

    public LongSummaryPreferenceCategory(Context ctx, AttributeSet attrs) {
        super(ctx, attrs);
    }

    @Override
    public void onBindViewHolder(PreferenceViewHolder holder) {
        super.onBindViewHolder(holder);
        TextView summary= (TextView)holder.findViewById(android.R.id.summary);
        if (summary != null) {
            // Enable multiple line support
            summary.setSingleLine(false);
            summary.setMaxLines(10); // Just need to be high enough I guess
        }
    }
    
}

科特林：

class LongSummaryPreferenceCategory @JvmOverloads constructor(
  context: Context, 
  attrs: AttributeSet? = null
): PreferenceCategory(context, attrs) {

  override fun onBindViewHolder(holder: PreferenceViewHolder) {
    super.onBindViewHolder(holder)
    val summary = holder.findViewById(android.R.id.summary) as? TextView
    summary?.let {
      // Enable multiple line support
      summary.isSingleLine = false
      summary.maxLines = 10 // Just need to be high enough I guess
    }
  }
}