监听TextView的变动

来源：互联网发布：常用网络协议端口号编辑：程序博客网时间：2024/04/28 05:13

editText.addTextChangedListener(new TextWatcher() {    @Override    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {        Toast.makeText(MainActivity.this, "beforeTextChanged: " + editText.getText().toString() + "; Start: " + i + "; 变化前: " + i1 + "; 变化后: " + i2, Toast.LENGTH_SHORT).show();    }    @Override    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {        Toast.makeText(MainActivity.this, "onTextChanged: " + editText.getText().toString() + "; Start: " + i + "; 变化前: " + i1 + "; 变化后: " + i2, Toast.LENGTH_SHORT).show();    }    @Override    public void afterTextChanged(Editable editable) {        Toast.makeText(MainActivity.this, "afterTextChanged: " + editText.getText().toString(), Toast.LENGTH_SHORT).show();    }});

i、i1、i2这三个参数有些诡异，i指的是从哪个位置开始变化，i1一般都是0，i2是新增加了多少字节。

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