Question

我正在尝试根据RadioButtons显示数组的内容。我用了2套按钮。该按钮应指向我的数组中的[x, y]。应显示数组的String值（使用Toast）。

是的，我是新手，但我试图挑选几个类似的例子，运气不佳。

public class MainActivity extends Activity {
    String[][] tipSize = {
            {"N/A","N/A","Pink","Lt Blue","Purple","Yellow","Brown","Orange","Tan","Blue","White","Beige"},
            {"N/A","Pink","Lt Blue","Purple","Yellow","Brown","Orange","Green","Tan","Blue","White","Beige"},
            {"N/A","N/A","Pink","Purple","Turquoise","Yellow","Green","Tan","Blue","White","Red","No Tip"},
            {"Pink","Lt Blue","Purple","Yellow","Orange","Green","Tan","Blue","Red","Beige","Gray","N/A"},
            {"Pink","Lt Plue","Purple","Orange","Green","Tan","Blue","White","Beige","Black","Gray","N/A"},
            {"Pink","Lt Blue","Yellow","Brown","Orange","Green","Tan","Blue","White","Beige","Black","N/A"},
            {"Pink","Lt Blue","Yellow","Brown","Tan","Blue","White","Red","Beige","Black","No Tip","N/A"},
            {"Pink","Lt Blue","Purple","Yellow","Orange","Green","Tan","Blue","Red","Beige","Gray","N/A"},
    };

private RadioGroup dispenser,ounce_pg;
private RadioButton disp,o_pg;
String tip = "";

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

    Button finishBtn = (Button) findViewById(R.id.button1);
    finishBtn.setOnClickListener (new View.OnClickListener() {      
        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            MainActivity.this.showit(); 
        }
    });     
}

protected void showit() {
    // TODO Auto-generated method stub
    disp = (RadioButton) findViewById(R.id.dispenser);
    o_pg = (RadioButton) findViewById(R.id.ounce_pg);
    tip = String tipSize [disp,o_pg];
    // tip is the displayed answer (Color of tip), tipSize[][] is the Array, disp is RadioButton 1 - o_pg is Radio Button 2 values. 

    Toast.makeText(MainActivity(),tip,Toast.LENGTH_LONG).show();
}

}

Answer 1

这一行有很多问题：

 tip = String tipSize [disp,o_pg];

[disp,o_pg]应为[disp][o_pg]，因为访问2D数组是通过array [x][y]
String tipSize没有意义，你不能在这里声明一个类型。如果你做了(String)它就会成为一个演员，那就没问题了（但是因为你有一个String数组，所以这是多余的 - 从String投射到String }没有做任何事情。）
disp和o_pg应为int。

这是因为在访问索引时，您无法将Object传递给数组，该数组将不会“搜索”您。这意味着您需要确定要访问的位置并将其传递出去。另请注意，索引从0开始，而不是1。

可编辑的例子是：

tip = tipSize [0][0]; //first element of the first array ("N/A")

Answer 2

快速而肮脏的方法是创建一个包含分隔字符串的简单字符串数组，该字符串将第二个值组合在一起，然后使用split函数，该函数本身返回一个字符串数组以获取各个值。

String [] allTips = {"a;b;c", "d;e;f"};
String [] sometips = alltips[1].split(";")
String tip = sometips[2];

会产生字母f

Android 2D阵列

2 个答案: