怎么通过循环数组设置button的id
如何通过循环数组设置button的id?
原问题来自于****问答频道,更多解决方案请查看:http://ask.****.net/questions/1415
原问题描述:
通过循环设置5个button的id,每次都随机分配。
随机分配没有问题。
在使用两个方法,随机设置button的id以及设置文本的时候出现错误。
弄得很混乱不知道问题出在哪里了?
Button b1, b2, b3, b4, b5; Button[] buttons = { b1, b2, b3, b4, b5 }; public void shuffleButtons() { Integer[] Id = { R.id.bChoice1, R.id.bChoice2, R.id.bChoice3, R.id.bChoice4, R.id.bChoice5 }; ArrayList<Integer> buttonId = new ArrayList<Integer>(Arrays.asList(Id)); Collections.shuffle(buttonId); for (int x = 0; x < 5; x++) { for (Button b : buttons) { b = (Button) findViewById(buttonId.get(x)); } } }
public void setButtonTxt() { for (Button b : buttons) { for (int x = 0; x <= buttons.length; x++) { b.setText(textList.get(x)); } } }
解决方案:
我认为你的循环中x
<= buttons.length
应该是x
< buttons.length
,但是你好像要将5个button设置给textList.get(5)
可以用xml预设button:
<Button android:id="@+id/bChoice1" ... /> <!-- etc --> <Button android:id="@+id/bChoice5" ... />
然后在后面的代码中,随机文本:
Button b1 = (Button)findViewById(R.id.bChoice1); Button b2 = (Button)findViewById(R.id.bChoice2); Button b3 = (Button)findViewById(R.id.bChoice3); Button b4 = (Button)findViewById(R.id.bChoice4); Button b5 = (Button)findViewById(R.id.bChoice5); // assuming textList is an ArrayList of text items // the next two lines will randomize your textList order // so you don't need to do it yourself and much less // error-prone long seed = System.nanoTime(); Collections.shuffle(textList, new Random(seed)); b1.setText(textList.get(0)); b2.setText(textList.get(1)); b3.setText(textList.get(2)); b4.setText(textList.get(3)); b5.setText(textList.get(4));