Android开发EditText禁止输入监听及InputFilter字符过滤

testEditText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
    @Override
    public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
        Log.e("TAG", "onEditorAction: 点击了回车按钮");
        return false;
    }
});

testEditText.setOnEditorActionListener(OnEditorActionListener { v, actionId, event ->
    Log.e("TAG", "onEditorAction: 点击了回车按钮")
    false
})

testEditText.addTextChangedListener(new TextWatcher() {
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        //参数1代表输入的
        Log.e("TAG", "beforeTextChanged: 输入前（内容变化前）的监听回调"+s.toString()+"==="+start+"==="+count+"==="+after);
    }
    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        Log.e("TAG", "beforeTextChanged: 输入中（内容变化中）的监听回调"+s.toString()+"==="+start+"==="+before+"==="+count);
    }
    @Override
    public void afterTextChanged(Editable s) {
        Log.e("TAG", "beforeTextChanged: 输入后（内容变化后）的监听回调"+s.toString());
    }
});

testEditText.addTextChangedListener(object : TextWatcher {
    override fun beforeTextChanged(s: CharSequence, start: Int, count: Int, after: Int) {
        //参数1代表输入的
        Log.e("TAG", "beforeTextChanged: 输入前（内容变化前）的监听回调$s===$start===$count===$after")
    }
    override fun onTextChanged(s: CharSequence, start: Int, before: Int, count: Int) {
        Log.e("TAG", "beforeTextChanged: 输入中（内容变化中）的监听回调$s===$start===$before===$count")
    }
    override fun afterTextChanged(s: Editable) {
        Log.e("TAG", "beforeTextChanged: 输入后（内容变化后）的监听回调$s")
    }
})

testEditText.setOnFocusChangeListener(new View.OnFocusChangeListener() {
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
      Log.e("TAG", "onFocusChange: 是否获取焦点：hasFocus：为true表示获取焦点，为false表示未获取");
    }
});

testEditText.setOnFocusChangeListener(OnFocusChangeListener { v, hasFocus ->
    Log.e("TAG", "onFocusChange: 是否获取焦点：hasFocus：为true表示获取焦点，为false表示未获取")
 })

InputFilter custemInputFiter = new InputFilter() {
    @Override
    public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) {
        //source 新输入的字符串
        //start 新输入的字符串起始下标，一般为0
        //end 新输入的字符串终点下标，一般为source长度-1
        //dest 输入之前文本框内容
        //dstart 原内容起始坐标，一般为0
        //dend 原内容终点坐标，一般为dest长度-1
        if (source.toString().equals("芝麻粒儿")) {
            //此示例：输入的如果是【芝麻粒儿】，则直接返回null，页面上表现为不显示
            return null;
        }
        Log.e("TAG", "filter: 自定义的过滤规则");
        return null;
    }
};
//传递的参数是数组，也就是可以有多个过滤规则
testEditText.setFilters(new InputFilter[]{
        custemInputFiter,
        new InputFilter.LengthFilter(6),
        new InputFilter.AllCaps()});

val custemInputFiter = InputFilter { source, start, end, dest, dstart, dend -> //source 新输入的字符串
    //start 新输入的字符串起始下标，一般为0
    //end 新输入的字符串终点下标，一般为source长度-1
    //dest 输入之前文本框内容
    //dstart 原内容起始坐标，一般为0
    //dend 原内容终点坐标，一般为dest长度-1
    if (source.toString() == "芝麻粒儿") {
        //此示例：输入的如果是【芝麻粒儿】，则直接返回null，页面上表现为不显示
        return@InputFilter null
    }
    Log.e("TAG", "filter: 自定义的过滤规则")
    null
}
//传递的参数是数组，也就是可以有多个过滤规则
testEditText.setFilters(
    arrayOf(
        custemInputFiter,
        LengthFilter(6),
        AllCaps()
    )
)