如何通过循环数组设置button的id?
原问题来自于CSDN问答频道,更多解决方案请查看:http://ask.csdn.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-pronelong 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));