返回数组onClick的下一个元素(Returning next element of array onClick)

返回数组onClick的下一个元素(Returning next element of array onClick)

这是我的代码：

final ArrayList<Integer> number1 = new ArrayList<Integer>(); for (int i = 0; i <= 13; ++i) number1.add(i); Collections.shuffle(number1); attack.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { final ImageView img = (ImageView) view.findViewById(R.id.randomOp); int i = 0; final String str = "img" + number1.get(i); if (i == 13){ Collections.shuffle(number1); } i++; img.setImageDrawable(getResources().getDrawable(getResourceID(str, "drawable", getContext()))); } });

我想要做的是每次发生onClick事件时，它都会返回数组的下一个元素。 上面的代码显然是错误的，因为它会创建int i并将其赋值为0，并且每次按按钮时都会这样做。 所以我想我应该把它放在主要方法中，但它必须是最终的，并且每次按下按钮时我都无法更改它的值。 我怎么能这样做，所以每次按下按钮时整数都不会被重置？

This is my code:

final ArrayList<Integer> number1 = new ArrayList<Integer>(); for (int i = 0; i <= 13; ++i) number1.add(i); Collections.shuffle(number1); attack.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { final ImageView img = (ImageView) view.findViewById(R.id.randomOp); int i = 0; final String str = "img" + number1.get(i); if (i == 13){ Collections.shuffle(number1); } i++; img.setImageDrawable(getResources().getDrawable(getResourceID(str, "drawable", getContext()))); } });

What I want to do is every time the onClick event occurs it would return the next element of the array. The above code is obviously wrong as it creates int i and assigns it value 0, and it does that every time I press the button. So I suppose I should put it in the main method, but it has to be final then and I can't change it's value every time the button is pressed. How could I make it so the integer wouldn't be reseted every time I press the button?

最满意答案

声明你的int i是你的类/活动的一个字段变量。 那不一定是最后的。 当它达到13时将其值重置为零。

public class YourActivity extends Activity { private int i = 0; //rest of your code .... }

你的代码应该看起来像这样，

final ArrayList<Integer> number1 = new ArrayList<Integer>(); for (int i = 0; i <= 13; ++i) number1.add(i); Collections.shuffle(number1); attack.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { final ImageView img = (ImageView) view.findViewById(R.id.randomOp); final String str = "img" + number1.get(i); i++; if (i == 13){ Collections.shuffle(number1); i = 0; } img.setImageDrawable(getResources().getDrawable(getResourceID(str, "drawable", getContext()))); } });

Declare your int i as a field variable of your class/activity. It need not be final then. And reset its value to zero when it reaches 13.

public class YourActivity extends Activity { private int i = 0; //rest of your code .... }

You code should look like this,

final ArrayList<Integer> number1 = new ArrayList<Integer>(); for (int i = 0; i <= 13; ++i) number1.add(i); Collections.shuffle(number1); attack.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { final ImageView img = (ImageView) view.findViewById(R.id.randomOp); final String str = "img" + number1.get(i); i++; if (i == 13){ Collections.shuffle(number1); i = 0; } img.setImageDrawable(getResources().getDrawable(getResourceID(str, "drawable", getContext()))); } });