小编Par*_*osh的帖子

我在仪表板活动中有textview txtQuantity.我为自定义适配器写了单独的类,它将包含已售出的产品.

 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_dashboard);

    list = (ListView) findViewById(R.id.listSoldItems);

    txtAmount = (TextView) findViewById(R.id.txtAmount);
    txtItems = (TextView) findViewById(R.id.txtItems);

    // init listview
    adapter = new Sold_item_adaptor(Dashboard.this, soldItemsList);
    list.setAdapter(adapter);

我可以使用适配器从列表中删除项目.删除项的代码用适配器类编写.

public View getView(final int position, View convertView, ViewGroup parent) {
    View vi = convertView;
    if (convertView == null)
        vi = inflater.inflate(R.layout.list_row_sold_item, null);

    TextView txtListItem = (TextView) vi.findViewById(R.id.txtListItem);
    final TextView txtQuantity = (TextView) vi.findViewById(R.id.txtQuantity);
    ImageView imgCancel = (ImageView) vi.findViewById(R.id.imgCancel);

    HashMap<String, String> mapData = new HashMap<String, String>();
    mapData = data.get(position);

    txtListItem.setText(mapData.get("product")); …

我想从代码中调用onCreateOptionsMenu,因为如果我使用:

menu.setGroupEnabled(0, false);

附:

public Menu menu;

public boolean onCreateOptionsMenu(Menu menu) {
    this.menu = menu;
    menu.add(0,0,0,"Option");
    return true;
}

如果用户从未按下菜单按钮,则不起作用.我怎样才能做到这一点？

谢谢

PS:如果这是一个不好的做法让我知道

当我尝试从列表中对json对象进行parjse时,我收到错误com.google.gson.JsonPrimitive无法强制转换为com.google.gson.JsonObject

输入:

{
    "r$contentRatings": [
        {
            "r$scheme": "urn:rt",
            "r$rating": "criticSummaryScore=-1,criticSummaryCount=0,criticSummaryCertified=false,criticSummaryRotten=false,fanSummaryScore=75,fanSummaryCount=4"
        }
    ]
}

码:

JsonElement elem = null;
elem = jsonObject.get("r$contentRatings");

if(elem != null) {
    JsonArray contentRatingsList = elem.getAsJsonArray();
    if(contentRatingsList != null) {                                                                                                    
        for(int i=0; i< contentRatingsList.size(); i++) {
            JsonObject scheme =contentRatingsList.get(i).getAsJsonObject().getAsJsonObject("r$scheme");
            JsonObject rating =contentRatingsList.get(i).getAsJsonObject().getAsJsonObject("r$rating");
            JsonArray subRatings = contentRatingsList.get(i).getAsJsonObject().getAsJsonObject("r$subRatings").getAsJsonArray();

错误:

在for循环中,当我尝试jsonobject从列表中访问时,r$scheme我收到一个错误

com.google.gson.JsonPrimitive无法强制转换为com.google.gson.JsonObject

你能告诉我如何摆脱这个错误..

我们的应用程序工作正常，在尝试创建会话时，opentok突然抛出一个奇怪的异常。

您能否建议我们，必须采取哪些措施来避免这种异常？

异常详细信息如下：

Caused by: com.opentok.exception.OpenTokException:
    org.xml.sax.SAXParseException; lineNumber: 6; columnNumber: 3; The element type "hr" must be terminated by the matching end-tag "</hr>". at 
    com.opentok.util.TokBoxXML.<init>(TokBoxXML.java:27) at 
    com.opentok.api.OpenTokSDK.do_request(OpenTokSDK.java:201) at 
    com.opentok.api.OpenTokSDK.create_session(OpenTokSDK.java:182) at 
    com.opentok.api.OpenTokSDK.create_session(OpenTokSDK.java:150) at 
    com.opentok.api.OpenTokSDK$create_session.call(Unknown Source) at 
    org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:42) at 
    com.opentok.api.OpenTokSDK$create_session.call(Unknown Source)

提前致谢。

我正在使用Android Studio.我在我的应用程序中使用e-POS-Print.jar.每当我运行代码时,我都会收到此错误:

java.lang.ExceptionInInitializerError
        at com.stc.printer.MyActivity.onCreate(MyActivity.java:48)
        at android.app.Activity.performCreate(Activity.java:5163)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1094)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2061)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2122)
        at android.app.ActivityThread.access$600(ActivityThread.java:140)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1228)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:137)
        at android.app.ActivityThread.main(ActivityThread.java:4895)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:511)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:994)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:761)
        at dalvik.system.NativeStart.main(Native Method)
 Caused by: java.lang.UnsatisfiedLinkError: Couldn't load eposprint: findLibrary returned null
        at java.lang.Runtime.loadLibrary(Runtime.java:365)
        at java.lang.System.loadLibrary(System.java:535)
        at com.epson.eposprint.Print.<clinit>(Print.java:18)
        at com.stc.printer.MyActivity.onCreate(MyActivity.java:48)

我的代码:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_my);

    System.out.println("started");

    printerName = getString(R.string.printername_t81ii);
    language = Builder.MODEL_SOUTHASIA;

    //bellow is line no. 48
    Print newPrinter = new Print(getApplicationContext());
    try{
        newPrinter.openPrinter(deviceType, …