项目中的错误,记录一下。

完整的错误信息如下:

1
The content of the adapter has changed but ListView did not receive a notification. Make sure the content of your adapter is not modified from a background thread, but only from the UI thread. [in ListView(2131492991, class android.widget.ListView) with Adapter(class com.impulsefitness.support.ui.WorkOrderDetailActivity$CustomFeedbackListViewAdapter)]

大意是说adapter内容已改变,但listview未收到通知,上下文不同步了。

精简一下,我有两个ActivityA和ActivityB。首先打开ActivityA,显示一个列表(listView),然后点击一个按钮startActivityForResult打开了B,B中添加了信息提交后setResult到A。B负责添加数据,添加完数据回到A,通知A重新load一遍远端数据,没问题(不要问我为什么要重新load一遍)。

在Activity A中单独起了一个线程去处理任务(请求远端service获取数据),handler收到message之后启动这个线程t,然后Activity A又startActivityForResult了另一个Activity B(这时候ActivityA已经onPause了,但是线程依然在运行,而且还在handler的callback队列中),当Activity B处理完逻辑setResult给Activity A(并且把自己给finish掉),需要让ActivityA重新请求service数据,也就是说线程t要重新运行一次,这时候handler里面已经有线程t这个对象了,然后就导致了上述的错误(好像这么说很牵强啊),参照CSDN牛人的文章,还是线程与上下文的事。

解决办法,在ActivityA的onPause将线程t从handler的callback中移除(然后handler再次收到同样的请求service的message时会重新将此线程t加入到callback队列中),如下:

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@Override
protected void onPause() {
super.onPause();
handler.removeCallbacks(tListFeedback);
}
Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);

switch (msg.what) {
//页面加载,loading显示
case 0x00:
pbFeedback.setVisibility(View.VISIBLE);
Message.obtain(this, 0x01, msg.obj).sendToTarget();
break;
//请求service,用于获取反馈列表数据
case 0x01:
tListFeedback = new ThreadListFeedback(msg.obj.toString());
ThreadPoolUtils.execute(tListFeedback);
break;

ActivityA的完整代码如下:

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super.findViewById(R.id.tvContactAddress);
tvComment2 = (TextView) super.findViewById(R.id.tvComment2);
tvPartIdNm = (TextView) super.findViewById(R.id.tvPartIdNm);
tvPartAmount = (TextView) super.findViewById(R.id.tvPartAmount);
tvPartFee = (TextView) super.findViewById(R.id.tvPartFee);
tvCustomerName = (TextView) super.findViewById(R.id.tvCustomerName);
tvMobile = (TextView) super.findViewById(R.id.tvMobile);
tvContactName = (TextView) super.findViewById(R.id.tvContactName);
tvContactMobile = (TextView) super.findViewById(R.id.tvContactMobile);
ivCall1 = (ImageView) super.findViewById(R.id.ivCall1);
ivCall2 = (ImageView) super.findViewById(R.id.ivCall2);
lvFeedback = (ListView) super.findViewById(R.id.lvFeedback);
pbFeedback = (ProgressBar) super.findViewById(R.id.pbFeedback);

customAdapter = new CustomFeedbackListViewAdapter(activity);
lvFeedback.setEmptyView(super.findViewById(R.id.llListViewNoItemFeedbackDetail));
lvFeedback.setAdapter(customAdapter);

AddFeedbackListener feedbackListener = new AddFeedbackListener();
btnAddFeedback.setOnClickListener(feedbackListener);

FinishListener finishListener = new FinishListener();
ivBack.setOnClickListener(finishListener);
llIvBack.setOnClickListener(finishListener);

tvTitle.setText(this.getResources().getText(R.string.activity_name_workorder_detail));

Intent i = getIntent();
Bundle b = i.getExtras();
if (null == b) {
tost(R.string.activity_workorder_detail_invalid_workorderno);
this.finish();
} else {
String workOrderNo = b.getString("workorderno");
if (null == workOrderNo) {
tost(R.string.activity_workorder_detail_invalid_workorderno);
this.finish();
} else {

Message.obtain(handler, 0x00, workOrderNo).sendToTarget(); //通知handler,开始load数据

tvWorkOrderNo.setText(workOrderNo);
tvServiceType.setText(b.getString("serviceType"));
tvBookingTime.setText(b.getString("bookingTime"));
tvContactAddress.setText(b.getString("constructAddress"));
tvComment2.setText(b.getString("comment2"));
tvPartIdNm.setText(b.getString("partId") + b.getString("partName"));
tvPartAmount.setText(b.getString("partAmount") + "台");
tvPartFee.setText(b.getString("partFee"));
tvCustomerName.setText(b.getString("customerName"));
tvMobile.setText(b.getString("mobile"));
tvContactName.setText(b.getString("contactName"));
tvContactMobile.setText(b.getString("contactMobile"));

ivCall1.setOnClickListener(new CallListener(tvMobile.getText().toString()));
ivCall2.setOnClickListener(new CallListener(tvContactMobile.getText().toString()));
}
}
}

/**
* 自定义ListView Adapter
*/
class CustomFeedbackListViewAdapter extends BaseAdapter {

//对象所在的上下文Activity
Activity activity;

public CustomFeedbackListViewAdapter(Activity activity) {
this.activity = activity;
}

@Override
public int getCount() {
return listViewData.size();
}

@Override
public Object getItem(int position) {
return listViewData.get(position);
}

@Override
public long getItemId(int position) {
return 0;
}

class ViewHolder {
TextView tvFeedbackContent;
ImageView ivArrowLaunch;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {

ViewHolder holder;
LayoutInflater inflater = activity.getLayoutInflater();

if (convertView == null) {
convertView = inflater.inflate(R.layout.listview_feedback_detail_item, null);
holder = new ViewHolder();

} else {
holder = (ViewHolder) convertView.getTag();
if (null == holder)
holder = new ViewHolder();
}

holder.tvFeedbackContent = (TextView) convertView.findViewById(R.id.tvFeedbackContentCombineStatement);
holder.ivArrowLaunch = (ImageView) convertView.findViewById(R.id.ivFeedbackContentArrowLaunch);

holder.ivArrowLaunch.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
tost(R.string.btn_txt_ok);
}
});

HashMap<String, Object> map = listViewData.get(position);
holder.tvFeedbackContent.setText(
map.get("employeeName").toString() + "在" + map.get("isrtDt") + "添加了反馈\"" + map.get("feedbackContent") + "\""
);

return convertView;
}
}

ThreadListFeedback tListFeedback;
/**
* 消息处理handler
*/
Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);

switch (msg.what) {
//页面加载,loading显示
case 0x00:
pbFeedback.setVisibility(View.VISIBLE);
Message.obtain(this, 0x01, msg.obj).sendToTarget();
break;
//请求service,用于获取反馈列表数据
case 0x01:
tListFeedback = new ThreadListFeedback(msg.obj.toString());
ThreadPoolUtils.execute(tListFeedback);
break;
//请求成功,已获取到数据
case 0x02:
pbFeedback.setVisibility(View.GONE);
Bundle b = msg.getData();
if (null != b)
try {
SaxJson(b.get("remoteInfo"));
} catch (JSONException e) {
e.printStackTrace();
Message.obtain(this, -0x03, e.getMessage()).sendToTarget();
}
else
Message.obtain(this, -0x03, ":" + getString(activity, R.string.not_acquired_data)).sendToTarget();
break;
//请求失败
case -0x02:
pbFeedback.setVisibility(View.GONE);
String m = getString(activity, R.string.not_acquired_data) + msg.obj;
tost(m);
break;
//解析json串异常
case -0x03:
tost("parse error" + msg.obj);
break;
//解析json正常,刷新UI
case 0x04:
customAdapter.notifyDataSetChanged();
Message.obtain(this, 0x05).sendToTarget();
break;
case 0x05:
setListViewHeight(lvFeedback);
break;
}
}
};

@Override
protected void onPause() {
super.onPause();
handler.removeCallbacks(tListFeedback);
}

/**
* 请求service获取反馈列表Runnable对象
*/
class ThreadListFeedback extends Thread {

String workOrderNo;

public ThreadListFeedback(String workOrderNo) {
this.workOrderNo = workOrderNo;
}

@Override
public void run() {
Map<String, Object> requestData = new HashMap<>();
Bundle bundle = new Bundle();
try {
requestData.put("workOrderNo", workOrderNo);

SoapInfo soapInfo = ServiceConstant.getWorkOrderFeedbackList();
soapInfo.setRequestData(requestData);

SoapService soapService = new SoapService(soapInfo);
String remoteInfo = soapService.getRemoteInfo();
bundle.putString("remoteInfo", remoteInfo);

if (remoteInfo == "-1")
Message.obtain(handler, -0x02, getString(activity, R.string.activity_workorder_detail_invalid_workorderno)).sendToTarget();
else {
Message m = Message.obtain(handler, 0x02);
m.setData(bundle);
m.sendToTarget();
}

Log.i(MainActivity.TAG, "remoteInfo:" + remoteInfo);

} catch (Exception e) {
e.printStackTrace();
Message.obtain(handler, -0x02, e.getMessage()).sendToTarget();
}
}
}

/**
* 解析service返回json串
*
* @param objJson
*/
void SaxJson(Object objJson) throws JSONException {
JSONArray jsonArray = new JSONArray(objJson.toString());

for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = (JSONObject) jsonArray.get(i);
HashMap<String, Object> item = new HashMap<>();

item.put("feedbackId", jsonObject.getString("feedbackId").trim());
item.put("workOrderNo", jsonObject.getString("workOrderNo").trim());
item.put("repairEmployeeId", jsonObject.getString("repairEmployeeId").trim());
item.put("employeeName", jsonObject.getString("employeeName").trim());

item.put("contactName", jsonObject.getString("contactName").trim());
item.put("contactPhone", jsonObject.getString("contactPhone").trim());
item.put("contactMobile", jsonObject.getString("contactMobile").trim());
item.put("contactTime", jsonObject.getString("contactTime").trim());
item.put("feedbackContent", jsonObject.getString("feedbackContent").trim());
item.put("isrtDt", SimpleUtils.DateTimeUtils.parseTime("yyyy-MM-dd", jsonObject.getString("isrtDt").trim()));

listViewData.add(item);
}

Message.obtain(handler, 0x04).sendToTarget();
}

/**
* 添加反馈按钮事件监听器
*/
class AddFeedbackListener implements View.OnClickListener {
@Override
public void onClick(View v) {

Intent i = getIntent();
i.putExtra("workorderno", tvWorkOrderNo.getText());
i.setClass(WorkOrderDetailActivity.this, WorkOrderFeedbackActivity.class);
startActivityForResult(i, 0x00);
}
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);

switch (requestCode) {
case 0x00:
//添加反馈完成,刷新数据
if (null != data) {
boolean submitted = data.getBooleanExtra("submitted", false);
if (submitted)
Message.obtain(handler, 0x00, data.getStringExtra("workOrderNo")).sendToTarget(); //通知handler,开始load数据
}
break;
}
}

/**
* 关闭当前Activity单击事件监听器
*/
class FinishListener implements View.OnClickListener {
@Override
public void onClick(View v) {
WorkOrderDetailActivity.this.finish();
}
}

/**
* Call监听器
*/
class CallListener implements View.OnClickListener {
String telNo;

public CallListener(String telNo) {
this.telNo = telNo;
}

@Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_DIAL, Uri.parse("tel://" + telNo));
startActivity(intent);
}
}

/**
* 自定义actionBar布局文件
* http://www.cnblogs.com/yc-755909659/p/4290784.html
*
* @param layoutId
*/

void setActionBarLayout(int layoutId) {

if (null != actionBar) {
actionBar.setDisplayShowHomeEnabled(false);
actionBar.setDisplayShowCustomEnabled(true);
actionBar.setDisplayShowTitleEnabled(false);
LayoutInflater inflator = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = inflator.inflate(layoutId, null);
ActionBar.LayoutParams layout = new ActionBar.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
actionBar.setCustomView(v, layout);
}
}
}

新解:

还是上面的错误信息,注意这句:

1
Make sure the content of your adapter is not modified from a background thread, but only from the UI thread.

确保adapter的内容不要在后台线程中修改,只能从UI线程中修改。而我的代码是直接message交给handler去处理的,难道这也算后台线程?于是想到了Runnable对象,它是依附于UI线程的,然后使用了handler.post(new Runnable())的方法,测试成功。