[英]how to change automatically the item id in android listview?
i have a custom adapter to place items inside listview.我有一个自定义适配器可以将项目放在列表视图中。 To customize it i have a listitem.xml file where i set the elements that compose a listitem.
为了自定义它,我有一个 listitem.xml 文件,我在其中设置了组成列表项的元素。
They are as follows:它们如下:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="50dp" >
<ImageView
android:id="@+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_marginLeft="5dp"
android:scaleType="fitXY" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="@+id/textView1"
android:layout_marginLeft="23dp"
android:layout_marginTop="5dp"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:text="" />
<ToggleButton
android:id="@+id/toggleButton1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
android:layout_marginRight="5dp"
android:text=""/>
</RelativeLayout>
I have a classe Settings.java that uses the following layout settings.xml:我有一个使用以下布局 settings.xml 的类 Settings.java:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/relativeLayoutSettings"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#666666"
android:orientation="vertical" >
<ListView
android:id="@+id/listViewSettings"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</ListView>
</RelativeLayout>
Class Settings.java is like this:类 Settings.java 是这样的:
public class Settings extends Activity {
private SensorAdapter sensorAdapter;
private Context context;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.settings);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE,
R.layout.title_bar);
context = getApplicationContext();
sensorAdapter = new SensorAdapter();
ListView sensorListview = (ListView) findViewById(R.id.listViewSettings);
sensorListview.setAdapter(sensorAdapter);
sensorListview.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
sensorItem sensor = sensorAdapter.getCodeLearnChapter(arg2);
}
});
}
public class sensorItem {
String sensorName;
String sensorDescription;
Drawable sensorImage;
}
public List<sensorItem> getDataForListView() {
List<sensorItem> sensorsList = new ArrayList<sensorItem>();
sensorItem sensorGps = new sensorItem();
sensorGps.sensorName = "Location";
sensorGps.sensorDescription = "Collect location";
sensorGps.sensorImage = getResources().getDrawable(R.drawable.location);
sensorItem sensorPhoto = new sensorItem();
sensorPhoto.sensorName = "Photos";
sensorPhoto.sensorDescription = "Collect photos";
sensorPhoto.sensorImage = getResources().getDrawable(R.drawable.photos);
sensorItem sensorAmplitude = new sensorItem();
sensorAmplitude.sensorName = "Sound";
sensorAmplitude.sensorDescription = "Collect amplitude";
sensorAmplitude.sensorImage = getResources().getDrawable(
R.drawable.amplitude);
sensorItem sensorOrientation = new sensorItem();
sensorOrientation.sensorName = "Orientation";
sensorOrientation.sensorDescription = "Collect orientation";
sensorOrientation.sensorImage = getResources().getDrawable(
R.drawable.compass);
sensorItem sensorSms = new sensorItem();
sensorSms.sensorName = "Messages";
sensorSms.sensorDescription = "Collect messages";
sensorSms.sensorImage = getResources().getDrawable(R.drawable.sms);
sensorItem sensorBattery = new sensorItem();
sensorBattery.sensorName = "Battery";
sensorBattery.sensorDescription = "Collect battery";
sensorBattery.sensorImage = getResources().getDrawable(
R.drawable.battery);
sensorItem sensorCalendar = new sensorItem();
sensorCalendar.sensorName = "Calendar";
sensorCalendar.sensorDescription = "Collect calendar";
sensorCalendar.sensorImage = getResources().getDrawable(
R.drawable.calendar);
sensorItem sensorAccelerometer = new sensorItem();
sensorAccelerometer.sensorName = "Accelerometer";
sensorAccelerometer.sensorDescription = "Collect accelerometer";
sensorAccelerometer.sensorImage = getResources().getDrawable(
R.drawable.accelerometer);
sensorItem sensorLight = new sensorItem();
sensorLight.sensorName = "Light";
sensorLight.sensorDescription = "Collect luminosity";
sensorLight.sensorImage = getResources().getDrawable(R.drawable.light);
sensorItem sensorContacts = new sensorItem();
sensorContacts.sensorName = "Contacts";
sensorContacts.sensorDescription = "Collect contact";
sensorContacts.sensorImage = getResources().getDrawable(
R.drawable.contacts);
sensorsList.add(sensorGps);
sensorsList.add(sensorPhoto);
sensorsList.add(sensorAmplitude);
sensorsList.add(sensorOrientation);
sensorsList.add(sensorSms);
sensorsList.add(sensorBattery);
sensorsList.add(sensorCalendar);
sensorsList.add(sensorAccelerometer);
sensorsList.add(sensorLight);
sensorsList.add(sensorContacts);
return sensorsList;
}
@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
public class SensorAdapter extends BaseAdapter {
List<sensorItem> sensorList = getDataForListView();
private ToggleButton locationToggle, photosToggle, soundToggle,
orientationToggle, messagesToggle, batteryToggle, calendarToggle,
accelerometerToggle, lightToggle, contactsToggle;
@Override
public int getCount() {
return sensorList.size();
}
@Override
public sensorItem getItem(int arg0) {
return sensorList.get(arg0);
}
@Override
public long getItemId(int arg0) {
return arg0;
}
@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
if (arg1 == null) {
LayoutInflater inflater = (LayoutInflater) Settings.this
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
arg1 = inflater.inflate(R.layout.listitem, arg2, false);
}
TextView sensorDescription = (TextView) arg1
.findViewById(R.id.textView2);
ImageView sensorImage = (ImageView) arg1
.findViewById(R.id.imageView1);
locationToggle = (ToggleButton) arg1.findViewById(R.id.toggleButton1);
locationToggle.setChecked(true);
locationToggle.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(context, "CARREGOU", Toast.LENGTH_LONG).show();
}
});
sensorItem sensor = sensorList.get(arg0);
sensorDescription.setText(sensor.sensorDescription);
sensorImage.setBackground(sensor.sensorImage);
return arg1;
}
public sensorItem getCodeLearnChapter(int position) {
return sensorList.get(position);
}
}
}
The problem with this is that now every element in the listitem.xml has exactly the same ID.这样做的问题是现在 listitem.xml 中的每个元素都具有完全相同的 ID。 So every toggle button has the same ID.
所以每个切换按钮都有相同的 ID。 I dont know which togglebutton the user pressed.
我不知道用户按下了哪个切换按钮。
How can i know which togglebutton the user pressed?我怎么知道用户按下了哪个切换按钮? Do i have to change the way i populate the listview?
我是否必须更改填充列表视图的方式?
Thx very much.非常感谢。
EDIT:编辑:
This is how it looks right now and the problem is that the ArrayList that i have to check whether a toggleButton in a row was clicked or not it seems to all set every element to true when i click in another row.这就是它现在的样子,问题是我必须检查一行中的 toggleButton 是否被单击的 ArrayList 当我单击另一行时,它似乎将每个元素都设置为 true。
Example: I have例子:我有
true |真实| true |
真实| true
真的
i click in the third button and i get我点击第三个按钮,我得到
true |真实| false |
假| true
真的
but if i click in the first button for example i get但如果我点击第一个按钮,例如我得到
false |假| true |
真实| true
真的
when i should get instead什么时候我应该得到
false |假| false |
假| true.
真的。
Here is the code adapter so someone can take a look.这是代码适配器,所以有人可以看看。
public class SensorAdapter extends BaseAdapter {
List<sensorItem> sensorList = getDataForListView();
private ToggleButton settingsToggle;
private ArrayList<Boolean> checkedSensors;
@Override
public int getCount() {
return sensorList.size();
}
@Override
public sensorItem getItem(int arg0) {
return sensorList.get(arg0);
}
@Override
public long getItemId(int arg0) {
return arg0;
}
@Override
public View getView(int arg0, View arg1, ViewGroup arg2) {
if (arg1 == null) {
LayoutInflater inflater = (LayoutInflater) Settings.this
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
arg1 = inflater.inflate(R.layout.listitem, arg2, false);
}
// TextView sensorName = (TextView)
// arg1.findViewById(R.id.textView1);
TextView sensorDescription = (TextView) arg1
.findViewById(R.id.textView2);
ImageView sensorImage = (ImageView) arg1
.findViewById(R.id.imageView1);
settingsToggle = (ToggleButton) arg1.findViewById(R.id.toggleButton1);
settingsToggle.setChecked(true);
checkedSensors = new ArrayList<Boolean>();
int i = 0;
while(i < 10){
checkedSensors.add(i,true);
i++;
}
settingsToggle.setTag(new Long(getItemId(arg0)));
settingsToggle.setOnClickListener(mOnToggleListener);
/*settingsToggle.setOnCheckedChangeListener(new OnCheckedChangeListener(){
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked){
if(isChecked){
Toast.makeText(Settings.this, "on "+buttonView.getId(), Toast.LENGTH_LONG).show();
}
else{
Toast.makeText(Settings.this, "off "+buttonView.getId(), Toast.LENGTH_LONG).show();
}
}
});*/
sensorItem sensor = sensorList.get(arg0);
// sensorName.setText(sensor.sensorName);
sensorDescription.setText(sensor.sensorDescription);
sensorImage.setBackground(sensor.sensorImage);
return arg1;
}
public OnClickListener mOnToggleListener = new OnClickListener(){
@Override
public void onClick(View v){
long id = (Long) v.getTag();
if (checkedSensors.get((int)id)){
//enableSensor(id);
checkedSensors.add((int)id, false);
}else{
//disableSensor(id);
checkedSensors.add((int)id, true);
}
for(int i = 0; i<10 ; i++){
System.out.println(i + " " + checkedSensors.get(i));
}
}
};
public sensorItem getSensor(int position) {
return sensorList.get(position);
}
}
}
You can set the index in a tag on the toggle button so the onClick event knows which index got clicked.您可以在切换按钮上的标签中设置索引,以便 onClick 事件知道点击了哪个索引。
Before you set the onClick listener add this line:在设置 onClick 侦听器之前添加以下行:
locationToggle.setTag(arg0);
And inside your onClick listener:在您的 onClick 侦听器中:
int position = (Integer)v.getTag();
you can create your listener ouside of getView like this:你可以像这样在 getView 之外创建你的监听器:
public OnClickListener mOnToggleListener = new OnClickListener() {
@Override
public void onClick(View v) {
//get id of your item from view
//v is locationToggleView
long id = (Long)v.getTag();
}
};
and make these change in getView method:并在 getView 方法中进行这些更改:
//set id as view tag when create or reuse view
//arg0 is position
locationToggle.setTag(new Long(getItemId(arg0)));
locationToggle.setOnClickListener(mOnToggleListener);
by this way you can get view related item id when locationToggle is clicked.通过这种方式,您可以在单击 locationToggle 时获取查看相关项目 ID。
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