小项目经验总结（一）android EditText字符串限制

本来是项目要用到，发现网上有很多类似的代码了。思路也都差不多

利用监视器TextWatcher?

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如果往edittext输入的的字符串大于10

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那么就设置edittext的gettext为0到10

public class EditViewFontMax {	protected int num;	public EditText et_content;	public void num(EditText et, int n) {		this.et_content = et;		this.num = n;		et_content.addTextChangedListener(new TextWatcher() {			private CharSequence temp;			private int selectionStart;			private int selectionEnd;			@Override			public void onTextChanged(CharSequence s, int start, int before,					int count) {				temp = s;				System.out.println("s=" + s);			}			@Override			public void beforeTextChanged(CharSequence s, int start, int count,					int after) {			}			@Override			public void afterTextChanged(Editable s) {				int number = num - s.length();				// tv_num.setText("" + number);				selectionStart = et_content.getSelectionStart();				selectionEnd = et_content.getSelectionEnd();				// System.out.println("start="+selectionStart+",end="+selectionEnd);				if (temp.length() > num) {					s.delete(selectionStart - 1, selectionEnd);					int tempSelection = selectionStart;					et_content.setText(s);					et_content.setSelection(tempSelection);// 设置光标在最后				}			}		});	}}

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