Android 从ArrayAdapter刷新列表视图
我正在使用Android 从ArrayAdapter刷新列表视图,android,android-listview,android-arrayadapter,Android,Android Listview,Android Arrayadapter,我正在使用ArrayAdapter将我的ArrayList中的数据绑定到我的ListView,并使用AlertDialog将数据插入我的ArrayList。我的问题是,更改完成后,我无法刷新我的列表视图 代码 protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.config_hidden); list
ArrayAdapter
将我的ArrayList
中的数据绑定到我的ListView
,并使用AlertDialog
将数据插入我的ArrayList
。我的问题是,更改完成后,我无法刷新我的列表视图
代码
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.config_hidden);
listView=(ListView) findViewById(R.id.hiddenList);
xmlFileManager=new XmlFileManager(this);
addNumber=(Button) findViewById(R.id.addNum);
addNumber.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
LayoutInflater factory = LayoutInflater.from(HiddenCall.this);
final View alertDialogView = factory.inflate(R.layout.add_number, null);
AlertDialog.Builder adb = new AlertDialog.Builder(HiddenCall.this);
adb.setView(alertDialogView);
adb.setTitle(R.string.dialog_title);
adb.setIcon(R.drawable.phone);
final AlertDialog alertDialog = adb.create();
adb.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
numberToAdd=(EditText) alertDialogView.findViewById(R.id.numberToAdd);
String number = numberToAdd.getText().toString();
if(number.length()>0){
xmlFileManager.addNumberToXml(number , HIDDEN_NUMBER_TYPE);
adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1, xmlFileManager.getHiddenNumbers());
adapter.setNotifyOnChange(true);
adapter.notifyDataSetChanged();
}
} });
adb.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
alertDialog.dismiss();
} });
adb.show();
}
});
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, xmlFileManager.getHiddenNumbers());
adapter.notifyDataSetChanged();
adapter.setNotifyOnChange(true);
listView.setAdapter(adapter);
}
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.config_隐藏);
listView=(listView)findViewById(R.id.hiddenList);
xmlFileManager=新的xmlFileManager(此);
addNumber=(按钮)findViewById(R.id.addNum);
addNumber.setOnClickListener(新的OnClickListener(){
公共void onClick(视图arg0){
LayoutInflater工厂=LayoutInflater.from(HiddenCall.this);
最终视图alertDialogView=工厂。充气(R.layout.add_编号,空);
AlertDialog.Builder adb=新建AlertDialog.Builder(HiddenCall.this);
adb.setView(alertDialogView);
adb.setTitle(R.string.dialog\u title);
adb.setIcon(R.drawable.phone);
final AlertDialog AlertDialog=adb.create();
adb.setPositiveButton(R.string.ok,新的DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog,int which){
numberToAdd=(EditText)alertDialogView.findViewById(R.id.numberToAdd);
字符串编号=numberToAdd.getText().toString();
如果(number.length()>0){
addNumberToXml(数字,隐藏的\u数字\u类型);
adapter=new ArrayAdapter(getApplicationContext(),android.R.layout.simple_list_item_1,xmlFileManager.getHiddenNumber());
adapter.setNotifyOnChange(true);
adapter.notifyDataSetChanged();
}
} });
adb.setNegativeButton(R.string.cancel,新建DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog,int which){
alertDialog.disclose();
} });
adb.show();
}
});
adapter=new ArrayAdapter(这是android.R.layout.simple_list_item_1,xmlFileManager.getHiddenNumbers());
adapter.notifyDataSetChanged();
adapter.setNotifyOnChange(true);
setAdapter(适配器);
}
每次单击创建新适配器。你不需要这样做。您可以修改现有适配器数据并调用notifyDataSetChanged()。在您的情况下,应该在onClick方法中调用listView.setAdapter(adapter)。您每次都在实例化一个新的适配器。您需要做的是将实例化适配器的行放在click listener之前,然后在click listener中修改该适配器并对其调用notifyDataSetChanged()。当然,为了修改数据,您必须向适配器添加一些setter
必须看起来与此类似:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.config_hidden);
listView=(ListView) findViewById(R.id.hiddenList);
//instantiate the adapter (just one time)
adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, xmlFileManager.getHiddenNumbers());
//assign the adapter to the listview
listView.setAdapter(adapter);
xmlFileManager=new XmlFileManager(this);
addNumber=(Button) findViewById(R.id.addNum);
addNumber.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
LayoutInflater factory = LayoutInflater.from(HiddenCall.this);
final View alertDialogView = factory.inflate(R.layout.add_number, null);
AlertDialog.Builder adb = new AlertDialog.Builder(HiddenCall.this);
adb.setView(alertDialogView);
adb.setTitle(R.string.dialog_title);
adb.setIcon(R.drawable.phone);
final AlertDialog alertDialog = adb.create();
adb.setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
numberToAdd=(EditText) alertDialogView.findViewById(R.id.numberToAdd);
String number = numberToAdd.getText().toString();
if(number.length()>0){
xmlFileManager.addNumberToXml(number , HIDDEN_NUMBER_TYPE);
//adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1, xmlFileManager.getHiddenNumbers());
//adapter.setNotifyOnChange(true);
//set the changed data
adapter.setData(xmlFileManager.getHiddenNumbers());
//notify that the model changed
adapter.notifyDataSetChanged();
}
} });
adb.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
alertDialog.dismiss();
} });
adb.show();
}
});
//adapter.notifyDataSetChanged();
//adapter.setNotifyOnChange(true);
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.config_隐藏);
listView=(listView)findViewById(R.id.hiddenList);
//实例化适配器(仅一次)
adapter=new ArrayAdapter(这是android.R.layout.simple_list_item_1,xmlFileManager.getHiddenNumbers());
//将适配器分配给listview
setAdapter(适配器);
xmlFileManager=新的xmlFileManager(此);
addNumber=(按钮)findViewById(R.id.addNum);
addNumber.setOnClickListener(新的OnClickListener(){
公共void onClick(视图arg0){
LayoutInflater工厂=LayoutInflater.from(HiddenCall.this);
最终视图alertDialogView=工厂。充气(R.layout.add_编号,空);
AlertDialog.Builder adb=新建AlertDialog.Builder(HiddenCall.this);
adb.setView(alertDialogView);
adb.setTitle(R.string.dialog\u title);
adb.setIcon(R.drawable.phone);
final AlertDialog AlertDialog=adb.create();
adb.setPositiveButton(R.string.ok,新的DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog,int which){
numberToAdd=(EditText)alertDialogView.findViewById(R.id.numberToAdd);
字符串编号=numberToAdd.getText().toString();
如果(number.length()>0){
addNumberToXml(数字,隐藏的\u数字\u类型);
//adapter=new ArrayAdapter(getApplicationContext(),android.R.layout.simple_list_item_1,xmlFileManager.getHiddenNumber());
//adapter.setNotifyOnChange(true);
//设置更改的数据
setData(xmlFileManager.getHiddenNumbers());
//通知模型已更改
adapter.notifyDataSetChanged();
}
} });
adb.setNegativeButton(R.string.cancel,新建DialogInterface.OnClickListener(){
public void onClick(DialogInterface dialog,int which){
alertDialog.disclose();
} });
adb.show();
}
});
//adapter.notifyDataSetChanged();
//adapter.setNotifyOnChange(true);
在adb.setPositiveButton()
的onClick()
中,不应创建新适配器。删除此行:
adapter = new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1, xmlFileManager.getHiddenNumbers());
如果您有一个小的ArrayList,要在ArrayList更改时强制更新ListView,可以使用以下代码段:
ArrayAdapter.clear();
ArrayAdapter.addAll(ArrayList);
ArrayAdapter.notifyDataSetChanged();
为什么每次都要创建一个新适配器而不是修改现有的适配器?您对notifyDataSetChanged()的调用如果您刚刚创建了适配器,则这些设置将毫无用处。我发现您缺少的另一件事是将适配器设置为listview…我发布了代码,希望能有所帮助。您仍然需要向适配器添加某种setter,并将更新的数据传递给它。@lxx不应该在onCreate()中设置适配器,然后在onClick()中对其进行修改吗这就是我要说的,创建和设置一次,然后在onClick()中修改(并调用notifyDataSetChanged())。@lxxArrayAdapter.clear();
ArrayAdapter.addAll(ArrayList);
ArrayAdapter.notifyDataSetChanged();