我使用自定义适配器制作了一个 ListView ，其中包含 ImageView 、 TextView 和复选框
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<ImageView --- textView --- checkbox >
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ListView 有一个 onClickListener，复选框有 onCheckListener..
我在开始时使用了一个 bool 数组(名为 status)来将选中或未初始化的复选框设置为 false。
假设列表中有 19 个项目，我选中第一个项目的复选框，它可以正常工作，并且 bool 数组的索引 0 更改为 true。 但是，当我滚动并检查列表的最后一个项目时，列表的第三个位置被反射(reflect)，并且 bool 数组的索引 3 变为 true。
还会自动选中许多其他复选框。
Java 代码
public class Search_list extends Activity {
static String str1 = "v1", str2 = "v2";
String s, item, idd;
static int spnr, range1, range2;
private CarHelper dbcarhelper = null;
private Cursor ourCursor;
CarHelper h = null;
List<String[]> names2 = null;
ListView LV;
MyCustomAdapter dataAdapter = null;
private ArrayList<Boolean> status;
byte[] Image = null;
Cursor c;
Bitmap decodedByte;
String c1_make = null, c1_model = null, c1_ver = null, c2_make = null,
c2_model = null, c2_ver = null;
int cntr = 0;
Button b1;
CheckBox cb;
protected ProgressDialog dialog;
List<String[]> mlist = new ArrayList<String[]>();
TextView tv1;
ArrayList<String> stg1;
ArrayList<String> arr_make = new ArrayList<String>();
ArrayList<String> arr_model = new ArrayList<String>();
ArrayList<String> arr_ver = new ArrayList<String>();
ArrayList<Bitmap> arr_img = new ArrayList<Bitmap>();
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.search_list);
dialog = ProgressDialog.show(Search_list.this, "Loading",
"Please Wait...");
status = new ArrayList<Boolean>(); /
LV = (ListView) findViewById(R.id.list);
//------------------ Compare button onClick() ------------------------------
b1 = (Button) findViewById(R.id.btnCmp);
b1.setOnClickListener(new Button.OnClickListener() {
public void onClick(View arg0) {
int count = 1;
if (cntr == 1) {
Toast.makeText(getApplicationContext(),
"Please select atleast two cars!",
Toast.LENGTH_LONG).show();
} else {
for (int i = 0; i < status.size(); i++) {
System.out.println("Compare click Position= " + i + " Status: "
+ status.get(i));
// System.out.println();
if (status.get(i)) {
if (count == 2) {
c2_make = arr_make.get(i);
c2_model = arr_model.get(i);
c2_ver = arr_ver.get(i);
count++;
}
if (count == 1) {
c1_make = arr_make.get(i);
c1_model = arr_model.get(i);
c1_ver = arr_ver.get(i);
count++;
}
} else {
}
}
Intent intent = new Intent(Search_list.this, DispComp.class);
Bundle b = new Bundle();
b.putString("car1", c1_make);
b.putString("carm1", c1_model);
b.putString("carv1", c1_ver);
b.putString("car2", c2_make);
b.putString("carm2", c2_model);
b.putString("carv2", c2_ver);
intent.putExtras(b);
startActivity(intent);
}
}
});
//--------------------------------------------------------------------------
dbcarhelper = new CarHelper(this);
dbcarhelper.createDatabase();
dbcarhelper.openDataBase();
if (s != null) {
startManagingCursor(ourCursor);
}
if (spnr == 1) {
byMakeModel();
}
if (spnr == 2) {
byBudgetFuel();
}
fill_list();
for (int i = 0; i < arr_make.size(); i++) {
status.add(false);
}
System.out.println("Inside onCreate() ... status all null..! ");
dialog.dismiss();
}
public void SetId(String s1, String s2, int s) {
System.out.println("SetMake spnr= |" + spnr + "|");
System.out.println("SetMake s= |" + s + "|");
str1 = s1;
str2 = s2;
spnr = s;
System.out.println("SetMake aftr spnr= |" + spnr + "|");
}
public void SetBudgetFuel(String s1, String s2, int s, int r1, int r2) {
System.out.println("SetBudget spnr= |" + spnr + "|");
System.out.println("SetBudget s= |" + s + "|");
System.out.println("SetBudget r1= |" + r1 + "|");
System.out.println("SetBudget r2= |" + r2 + "|");
str1 = s1;
str2 = s2;
spnr = s;
range1 = r1;
range2 = r2;
System.out.println("SetMake aftr spnr= |" + spnr + "|");
}
// -------------------------------------------------------------------------
public void byMakeModel() {
// make n model selected *******************************
if (str2.equalsIgnoreCase("(Select)")) {
dbcarhelper.search_by_make(str1);
} else {
dbcarhelper.search_by_makemodel(str1, str2);
}
}
// -------------------------------------------------------------------------
public void byBudgetFuel() {
// budget or fuel selected
// ************************************************
if (str1.equalsIgnoreCase("Any Budget")) {
dbcarhelper.search_by_fuel(str2);
}
else if (str2.equalsIgnoreCase("All")) {
dbcarhelper.search_by_budget(range1, range2);
}
else {
dbcarhelper.search_by_budgetfuel(str2, range1, range2);
}
}
// -------------------------------------------------------------------------
public void fill_list() {
final CarHelper h = new CarHelper(getApplicationContext());
Toast.makeText(getApplicationContext(), "Inside if case",
Toast.LENGTH_LONG).show();
mlist = h.selectAllb2();
stg1 = new ArrayList<String>();
int x = 0;
String stg;
for (String[] srch : mlist) {
stg = "Make: " + srch[0] + "\nModel: " + srch[1] + " \nVersion: "
+ srch[2] + "\nPrice: Rs. " + srch[3];
stg1.add(stg);
arr_make.add(srch[0]);
arr_model.add(srch[1]);
arr_ver.add(srch[2]);
System.out.println("srch 0" + srch[0] + "\nsrch 1" + srch[1]
+ "\nsrch 2" + srch[2] + "\nsrch 3" + srch[3]);
x++;
}
System.out.println("length--------------------- " + stg1.size());
// ----------------Image--------------------
int run = 0;
c = dbcarhelper.fetchImgRow("1");
if (c.moveToFirst()) {
do {
Image = c.getBlob(c.getColumnIndex("img_str"));
System.out.println("Image = " + Image);
System.out.println("run = " + run);
byte[] decodedString = Base64.decode(Image, Base64.DEFAULT);
decodedByte = BitmapFactory.decodeByteArray(decodedString, 0,
decodedString.length);
arr_img.add(decodedByte);
System.gc();
run++;
} while (c.moveToNext());
}
dbcarhelper.close();
// ----------------Image--------------------
System.out.println("run after close() = " + run);
dataAdapter = new MyCustomAdapter(this, R.layout.new_search_adptr, stg1);
LV.setAdapter(dataAdapter);
int[] colors = { 0, 0xff00ffff, 0 };
LV.setDivider(new GradientDrawable(Orientation.RIGHT_LEFT, colors));
LV.setDividerHeight(4);
LV.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
New_Details det = new New_Details();
System.out.println("Inside Click !");
String car1 = h.srch_make.get(position);
String carm1 = h.srch_model.get(position);
String carv1 = h.srch_ver.get(position);
det.setImg(arr_img.get(position));
// Bitmap car_img = arr_img.get(position);
// System.out.println("position: " + position);
// System.out.println("arr_img position: " +
// arr_img.get(position));
Intent intent = new Intent(Search_list.this, New_Details.class);
Bundle b = new Bundle();
b.putString("car1", car1);
b.putString("carm1", carm1);
b.putString("carv1", carv1);
intent.putExtras(b);
startActivity(intent);
}
});
}
private class MyCustomAdapter extends ArrayAdapter<String> {
public MyCustomAdapter(Context context, int textViewResourceId,
ArrayList<String> sList) {
super(context, textViewResourceId, sList);
}
private class ViewHolder {
TextView text;
CheckBox chkbox;
ImageView imageview;
}
@Override
public View getView(final int position, View convertView,
ViewGroup parent) {
ViewHolder holder = null;
//Log.v("ConvertView", String.valueOf(position));
if (convertView == null) {
LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = vi.inflate(R.layout.new_search_adptr, null);
holder = new ViewHolder();
holder.text = (TextView) convertView
.findViewById(R.id.adapterText1);
holder.chkbox = (CheckBox) convertView
.findViewById(R.id.checkBox1);
//---------- Setting the checkBoxes -----------------------------------
if (status.get(position)) {
holder.chkbox.setChecked(true);
} else {
holder.chkbox.setChecked(false);
}
//-----------------------------------------------------------------
holder.imageview = (ImageView) convertView
.findViewById(R.id.imageView1);
convertView.setTag(holder);
holder.chkbox.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
CheckBox cb = (CheckBox) v;
if (cb.isChecked()) {
// User checked (selected) a car
// *********************************
if (cntr > 1) {
// More than two cars selected
Toast.makeText(getApplicationContext(),
"Please select only two cars!",
Toast.LENGTH_LONG).show();
cb.setChecked(false);
} else {
// car selected
status.set(position, true);
cntr++;
System.out.println("Chk List Position= " + position );
for (int i = 0; i < status.size(); i++) {
System.out.println("Chkbox chkd Position= " + i + " Status: "
+ status.get(i));
}
}
} else {
// User Unchecked (de - selected) a car
// *********************************
cntr--;
status.set(position, false);
System.out.println("Unchk List Position= " + position );
for (int i = 0; i < status.size(); i++) {
System.out.println("UnChkbox chkd Position= " + i + " Status: "
+ status.get(i));
}
}
}
});
} else {
holder = (ViewHolder) convertView.getTag();
holder.chkbox.setOnCheckedChangeListener(null);
}
holder.text.setText(stg1.get(position).toString());
// setting image
holder.imageview.setImageBitmap(arr_img.get(position));
return convertView;
}
}
}
请帮我找到解决办法。谢谢。
堆栈跟踪
08-17 06:58:16.798: W/dalvikvm(698): threadid=1: thread exiting with uncaught exception (group=0x40015560)
08-17 06:58:16.808: E/AndroidRuntime(698): FATAL EXCEPTION: main
08-17 06:58:16.808: E/AndroidRuntime(698): java.lang.OutOfMemoryError: bitmap size exceeds VM budget
08-17 06:58:16.808: E/AndroidRuntime(698): at android.graphics.BitmapFactory.nativeDecodeByteArray(Native Method)
08-17 06:58:16.808: E/AndroidRuntime(698): at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:405)
08-17 06:58:16.808: E/AndroidRuntime(698): at android.graphics.BitmapFactory.decodeByteArray(BitmapFactory.java:418)
08-17 06:58:16.808: E/AndroidRuntime(698): at com.MyAuto.Search_list.fill_list(Search_list.java:334)
08-17 06:58:16.808: E/AndroidRuntime(698): at com.MyAuto.Search_list.onCreate(Search_list.java:196)
08-17 06:58:16.808: E/AndroidRuntime(698): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-17 06:58:16.808: E/AndroidRuntime(698): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
08-17 06:58:16.808: E/AndroidRuntime(698): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
08-17 06:58:16.808: E/AndroidRuntime(698): at android.app.ActivityThread.access$1500(ActivityThread.java:117)
08-17 06:58:16.808: E/AndroidRuntime(698): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
08-17 06:58:16.808: E/AndroidRuntime(698): at android.os.Handler.dispatchMessage(Handler.java:99)
08-17 06:58:16.808: E/AndroidRuntime(698): at android.os.Looper.loop(Looper.java:123)
08-17 06:58:16.808: E/AndroidRuntime(698): at android.app.ActivityThread.main(ActivityThread.java:3683)
08-17 06:58:16.808: E/AndroidRuntime(698): at java.lang.reflect.Method.invokeNative(Native Method)
08-17 06:58:16.808: E/AndroidRuntime(698): at java.lang.reflect.Method.invoke(Method.java:507)
08-17 06:58:16.808: E/AndroidRuntime(698): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-17 06:58:16.808: E/AndroidRuntime(698): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-17 06:58:16.808: E/AndroidRuntime(698): at dalvik.system.NativeStart.main(Native Method)
最佳答案
供引用使用示例
Get Selected Item Using Checkbox in Listview
将您的适配器类更改为以下。
您需要重写getCount并使用SparseBooleanArray
private class MyCustomAdapter extends ArrayAdapter<String> implements CompoundButton.OnCheckedChangeListener{
ArrayList<String> myList;
public MyCustomAdapter(Context context, int textViewResourceId,
ArrayList<String> sList) {
super(context, textViewResourceId, sList);
mCheckStates = new SparseBooleanArray(sList.size());
myList= sList;
}
private SparseBooleanArray mCheckStates;
private class ViewHolder {
TextView text;
CheckBox chkbox;
ImageView imageview;
}
@Override
public int getCount() {
return stg1.size();
}
@Override
public View getView(final int position, View convertView,ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = vi.inflate(R.layout.new_search_adptr, null);
holder = new ViewHolder();
holder.text = (TextView) convertView
.findViewById(R.id.adapterText1);
holder.chkbox = (CheckBox) convertView
.findViewById(R.id.checkBox1);
holder.imageview = (ImageView) convertView
.findViewById(R.id.imageView1);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.chkbox.setTag(position);
holder.chkbox.setChecked(mCheckStates.get(position, false));
holder.chkbox.setOnCheckedChangeListener(this);
holder.text.setText(stg1.get(position).toString());
holder.imageview.setImageBitmap(arr_img.get(position));
return convertView;
}
public boolean isChecked(int position) {
return mCheckStates.get(position, false);
}
public void setChecked(int position, boolean isChecked) {
mCheckStates.put(position, isChecked);
}
public void toggle(int position) {
setChecked(position, !isChecked(position));
}
@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
mCheckStates.put((Integer) buttonView.getTag(), isChecked);
}
}
要点击按钮
StringBuilder result = new StringBuilder();
for(int i=0;i<youradapter.mCheckStates.size();i++)
{
if(youradapter.mCheckStates.get(i)==true)
{
result.append(arr_make.get(i).toString()+" "+arr_model.get(i).toString()+" "+arr_ver.get(i).toString());
result.append("\n");
}
}
Toast.makeText(MainActivity.this, result, 1000).show();
}
关于android - ListView 自定义适配器随机检查值，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/18180349/