android editText输入文本框限制输入字数和字数提示

蔚落 2023-10-10 12:57 131阅读 0赞

EditText content;//定义一个文本输入框
TextView hasnum;// 用来显示剩余字数
int num =140;//限制的最大字数　　
content = (EditText) findViewById(R.id.et_content);
hasnumTV = (TextView) findViewById(R.id.tv_num);
hasnumTV.setText(num+“”);

//下面为EditText文本框添加监听

content.addTextChangedListener(newTextWatcher(){
private CharSequence temp;
private int selectionStart;
private int selectionEnd;
public void beforeTextChanged(CharSequence s,int start,int count,int after){
}

public void onTextChanged(CharSequence s,int start,int before,int count){
temp = s;
}

public void afterTextChanged(Editable s){
int number = num - s.length();
hasnumTV.setText(“”+ number);
selectionStart = content.getSelectionStart();
selectionEnd = content.getSelectionEnd();
if(temp.length()> num){
s.delete(selectionStart -1, selectionEnd);
int tempSelection = selectionEnd;
content.setText(s);
content.setSelection(tempSelection);//设置光标在最后
}
}
});

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