Question

我的Android应用有问题。我尝试从另一个类获取一个变量，并将其用作if语句的条件，这是我用来获取变量的代码：

发送变量（是一个字符串）：

Intent intent = new Intent(context, Example1.class);
intent.putExtra("categ", result);

接收变量：

final String[] pos_categ ;
pos_categ = intent1.getExtras().getStringArray("categ");

这里我在if语句中声明了我想要更改的3个变量：

    String[] title = null;
    String[] eng = null;
    final String[] dan = null;

这些是我从中获取title，eng和dan变量数据的字符串：

String [] lessons_titles = {"1","2","3","4","5","6","7","8","9","10","11","12","13","14","15","16","17","18","19","20","30","40","50","60","70","80","90"};
String [] eng_version = {"one","two","three","four","five","six","seven","eight","nine","ten","eleven","twelve","thirteen","fourteen","fifteen","sixteen","seventeen","eighteen","nineteen","twenty","thirty","fourty","fifty","sixty","seventy","eighty","ninety"};
String[] dan_version = {"En","To","Tre","Fire","Fem","Seks","Syv","Otte","Ni","Ti","Elleve","Tolv","Tretten","Fjorten","Femten","Seksten","Sytten","Atten","Nitten","Tyve","Tredive","Fyrre","Halvtreds","Tres","Halvfjerds","Firs","Halvfems"};

String [] lessons_titles2 = {"Hej, jeg hedder Khalid","Hvad hedder du?","Jeg hedder Ellen"};
String [] eng_version2 = {"Hej, jeg hedder Khalid","Hvad hedder du?","Jeg hedder Ellen"};
String[] dan_version2 = {"Hej, jeg hedder Khalid","Hvad hedder du?","Jeg hedder Ellen"};

String [] lessons_titles3 = {"Hvor kommer du fra?","Jeg kommer fra Australien.","Hvor kommer du fra?","Jeg kommer dra Moroko."};
String [] eng_version3 = {"Hvor kommer du fra?","Jeg kommer fra Australien.","Hvor kommer du fra?","Jeg kommer dra Moroko."};
String[] dan_version3 = {"Hvor kommer du fra?","Jeg kommer fra Australien.","Hvor kommer du fra?","Jeg kommer dra Moroko."};

String [] lessons_titles4 = {"Hvad sprog taler du?","Jeg taler engelsk.","Hvad med dig?","Jeg taler fransk og arabisk."};
String [] eng_version4 = {"Hvad sprog taler du?","Jeg taler engelsk.","Hvad med dig?","Jeg taler fransk og arabisk."};
String[] dan_version4 = {"Hvad sprog taler du?","Jeg taler engelsk.","Hvad med dig?","Jeg taler fransk og arabisk."};

String [] lessons_titles5 = {"Hvor gammel er du?","Jeg er 22."};
String [] eng_version5 = {"Hvor gammel er du?","Jeg er 22."};
String[] dan_version5 = {"Hvor gammel er du?","Jeg er 22."};

String [] lessons_titles6 = {"Hvor bor du?","Jeg bor i Vestergade.","Hvor i Vestergade?","I nummer 38."};
String [] eng_version6 = {"Hvor bor du?","Jeg bor i Vestergade.","Hvor i Vestergade?","I nummer 38."};
String[] dan_version6 = {"Hvor bor du?","Jeg bor i Vestergade.","Hvor i Vestergade?","I nummer 38."};

这里我使用if语句根据＆＃34; pos_categ＆＃34;的值来改变变量。我尝试将pos_categ的第一个值与我已经拥有的某些字符串的第一个值进行比较：

    if (pos_categ[0].equals(lessons_titles1[position[0])){
        title[0] = lessons_titles[position[0]];
        eng[0] = eng_version[position[0]];
        dan[0] = dan_version[position[0]].toLowerCase();

    }
    else if (pos_categ[0].equals(lessons_titles2[position[0])){
        title[0] = lessons_titles2[position[0]];
        eng[0] = eng_version2[position[0]];
        dan[0] = dan_version2[position[0]].toLowerCase();

    }
    else if (pos_categ[0].equals(lessons_titles3[position[0])){
        title[0] = lessons_titles3[position[0]];
        eng[0] = eng_version3[position[0]];
        dan[0] = dan_version3[position[0]].toLowerCase();

    }
    else if (pos_categ[0].equals(lessons_titles4[position[0])){
        title[0] = lessons_titles4[position[0]];
        eng[0] = eng_version4[position[0]];
        dan[0] = dan_version4[position[0]].toLowerCase();

    }
    else if (pos_categ[0].equals(lessons_titles5[position[0])){
        title[0] = lessons_titles5[position[0]];
        eng[0] = eng_version5[position[0]];
        dan[0] = dan_version5[position[0]].toLowerCase();

    }
    else if (pos_categ[0].equals(lessons_titles6[position[0])){
        title[0] = lessons_titles6[position[0]];
        eng[0] = eng_version6[position[0]];
        dan[0] = dan_version6[position[0]].toLowerCase();

    }

    title_view.setText(title[0]);
    eng_view.setText(eng[0]);
    dan_view.setText(dan[0]);

问题在于，当我打开应用程序时，我应该根据变量pos_categ获得正确的信息。相反，我得到了这个错误：

Unfortunately, test has stopped working.
Blame the Split Screen.

Answer 1

最终变量只能初始化一次。您正在声明“final String [] pos_categ”，这意味着您无法更改该值。 String []也表示java中的String数组。

我的理解是你要传递一个字符串并对其进行评估，如果是这样，你[]为pos_categ变量。

或者，如果你想在android中的活动之间传递数组，你应该执行以下操作：

Passing string array between android activities。

我不知道这是否会解决你的问题，因为我没有看到“不幸的是，测试已停止工作。责怪分屏。”来自。

修改：

要解决你的if问题，你需要找出结果和位置的值，然后看看它们是否应该是什么。您可以使用toast，或使用eclipse调试器（如果您使用的是eclipse）来查找。

但是这里的if不是真正的问题，无论如何它是你的比较。当你应该使用STRINGS时，你正在使用STRING ARRAY（“String [] title”）（如：“String title”）。 docs.oracle.com/javase/tutorial/java/nutsandbolts/arrays.html

编辑2

int position = getIntent().getExtras().getInt("position"); String[] pos_categ ; pos_categ = intent1.getExtras().getString("categ");

-

String title = ""; String eng = ""; String dan = "";

-

if (pos_categ.equals(lessons_titles1[position)){ title = lessons_titles[position]; eng = eng_version[position]; dan = dan_version[position].toLowerCase(); } //else if....

如果陈述没有返回正确的结果

1 个答案: