我正在尝试使用自定义“可检查”元素构建清单。我能够显示列表，选中复选框（它是一个 ImageView）并将每个复选框的状态保存在数据库中。
不幸的是，当我打开一个清单时，我想用一些选中的复选框来初始化清单，但我不能。它不起作用。
截图
这是我打开清单时的屏幕：
图例：显示一个未选中每个复选框的清单的 android 屏幕
我使用 .setEnabled(true/false) 方法来直观地显示不同的状态（用于调试目的）。
基本上，当我作为用户勾选复选框时，它看起来像这样：
图例：选中复选框的 android 屏幕
等级制度
- 源代码
- com.checkit.app（包）
- CheckableLinearLayout.java
- 任务活动.java
- TasksAdapter.java <= （我认为问题可以在这个文件的某处解决）
- [...]
- 资源
- 可绘制的
- ic_hideable_item.xml
- 可绘制的 mdpi
- btn_check_off.png
- btn_check_on.png
- [...]
- 布局
- 活动任务.xml
- task_items.xml
- [...]
代码
任务适配器.java
import java.util.ArrayList;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;
/**
* @author tony
*
*/
public class TasksAdapter extends BaseAdapter {
/* ************************************* properties */
// list of items
private ArrayList<Task> mItemsList;
// context
private Context mContext;
// a single task
private Task taskItem = null;
/* ************************************* contructors */
/**
* @param context
* @param item
*/
public TasksAdapter(Context context, ArrayList<Task> pTasksItems) {
this.mContext = context;
this.mItemsList = pTasksItems;
}
/* ************************************* override methods */
@Override
public int getCount() {
return mItemsList.size();
}
@Override
public Task getItem(int position) {
return mItemsList.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
/**
* Display the view of the task of a checklist
*/
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// if we access for the first time : we have to user LayoutInflater
if (convertView == null) {
LayoutInflater inflater = ((Activity) mContext).getLayoutInflater();
convertView = inflater.inflate(R.layout.task_items, null);
}
// get the font size (from the SharedPreferences)
String fontSizeSetting = MainActivity.getmFontSize();
// set the text on the tasks
//CheckBox checkbox = (CheckBox) convertView.findViewById(R.id.task);
com.checkit.app.CheckableLinearLayout checkboxGlobal = (com.checkit.app.CheckableLinearLayout) convertView.findViewById(R.id.taskGlobalCheckbox);
ImageView checkboxImg = (ImageView) convertView.findViewById(R.id.taskImageCheckbox);
TextView checkboxTxt = (TextView) convertView.findViewById(R.id.task_text);
// get the Task
taskItem = (Task) mItemsList.get(position);
// is this task done ?
// .getIsTick values are 0 (false) or 1 (true)
if (taskItem.getIsTick() == 1) {
// the task is done, so tick the checkbox
Log.d("TEST", "TasksAdapter getView() is getIsTick");
// TODO I should do something here to tick the box. But what should I do ??
checkboxGlobal.setChecked(true); // I go to the method, but this do nothing ??
checkboxGlobal.setEnabled(true); // just to show that it's well working
// INFO : below are a lot of tries, but no one works properly
//StateListDrawable states = new StateListDrawable();
//Drawable drawable = convertView.getResources().getDrawable(R.drawable.ic_hideable_item);
//drawable.setState(new int[] {android.R.attr.state_checked});
//states.addState(new int[] {android.R.attr.state_checked}, drawable);
//states.setState(new int[] {android.R.attr.state_checked});
//checkboxImg.setImageDrawable(states);
//checkboxImg.setImageDrawable(drawable);
} else {
// the task is undone, so untick the checkbox
Log.d("TEST", "TasksAdapter getView() is not getIsTick");
checkboxGlobal.setChecked(false);
checkboxGlobal.setEnabled(false);
}
// set the text on the TextView
checkboxTxt.setText(taskItem.getName());
// change the font size
checkboxTxt.setTextSize(Float.parseFloat(fontSizeSetting));
// return the view
return convertView;
}
}
CheckableLinearLayout.java
import android.content.Context;
import android.util.AttributeSet;
import android.util.Log;
import android.widget.Checkable;
import android.widget.LinearLayout;
/**
* File based on the official example (cf. http://developer.android.com/samples/CustomChoiceList/index.html )
*
* This is a simple wrapper for {@link android.widget.LinearLayout} that implements the {@link android.widget.Checkable}
* interface by keeping an internal 'checked' state flag.
* <p>
* This can be used as the root view for a custom list item layout for
* {@link android.widget.AbsListView} elements with a
* {@link android.widget.AbsListView#setChoiceMode(int) choiceMode} set.
*/
public class CheckableLinearLayout extends LinearLayout implements Checkable {
/* ************************************* properties */
// android state for "checked"
private static final int[] CHECKED_STATE_SET = {android.R.attr.state_checked};
// default state : FALSE = every checkbox are untick
private boolean mChecked = false;
/* ************************************* contructors */
/**
* @param context
* @param attrs
*/
public CheckableLinearLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
/* ************************************* override methods */
@Override
public int[] onCreateDrawableState(int extraSpace) {
int[] drawableState = super.onCreateDrawableState(extraSpace + 1);
if (isChecked()) {
Log.d("TEST ", "CheckableLinearLayout.onCreateDrawableState("+extraSpace+") (isChecked TRUE)");
mergeDrawableStates(drawableState, CHECKED_STATE_SET);
}
return drawableState;
}
/* ************************************* aspects methods */
/**
* Is this checked ?
*/
public boolean isChecked() {
Log.d("TEST ", "CheckableLinearLayout.isChecked()");
return mChecked;
}
/**
* Set the item as checked (if it's not yet)
*/
@Override
public void setChecked(boolean b) {
Log.d("TEST ", "CheckableLinearLayout.setChecked()");
// close if it's still the same state
if (b == mChecked) {
return;
}
Log.d("TEST ", "CheckableLinearLayout.setChecked() inside");
// modify the state
mChecked = b;
// refresh the drawable state
refreshDrawableState();
}
/**
* Toggle current state
*/
public void toggle() {
Log.d("TEST ", "CheckableLinearLayout.toggle()");
setChecked(!mChecked);
}
}
ic_hideable_item.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:state_checked="true"
android:drawable="@drawable/btn_check_on"
/>
<item
android:state_checked="false"
android:drawable="@drawable/btn_check_off"
/>
</selector>
活动任务.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ListView
android:id="@+id/listTasks"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:choiceMode="multipleChoice"
/>
</LinearLayout>
task_items.xml
<?xml version="1.0" encoding="utf-8"?>
<com.checkit.app.CheckableLinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/taskGlobalCheckbox"
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:minHeight="?android:listPreferredItemHeight"
android:orientation="horizontal"
>
<ImageView
android:id="@+id/taskImageCheckbox"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:duplicateParentState="true"
android:src="@drawable/ic_hideable_item"
android:contentDescription="@string/img_alt_checkbox"
/>
<TextView
android:id="@+id/task_text"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:duplicateParentState="true"
android:paddingTop="10dip"
android:paddingRight="10dip"
android:paddingBottom="10dip"
/>
</com.checkit.app.CheckableLinearLayout>
更多的
以下是我想说的一些事情：
checkboxGlobal.setEnabled(true);正如我们在屏幕截图（灰色标题）中看到的那样，效果很好。但checkboxGlobal.setChecked(true);似乎没有效果（？）- 有一次，我试过
Drawable drawable = convertView.getResources().getDrawable(R.drawable.ic_hideable_item);跟着checkboxImg.setImageDrawable(states);. 使用选中的复选框初始化复选框可以完美地工作，但是无法取消选中该框。
编辑 2014-03-12：我的代码基于来自“Android 开发者”网站的官方代码示例（参见项目“CustomChoiceList”，可在此处获得：http: //developer.android.com/samples/CustomChoiceList/index.html。 html ).
编辑 2014-03-13 ：删除不必要的代码，以提高可读性
在此先感谢您的帮助。随意询问您是否需要更多代码。真诚的，托尼