EditText控件及相关操作

阳光穿透心脏的1/2处 2022-08-04 14:42 101阅读 0赞

hint是默认灰色的提示信息 
    drawableLeft可在文本框内插入图片
    inputType是能在文本框内输入字符的类型
    lines是文本框显示几列

protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            editText = (EditText) findViewById(R.id.edit_text1);
    
    //        文本框改变时触发事件
            editText.addTextChangedListener(new TextWatcher() {
                @Override
                public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    
                }
    
                @Override
                public void onTextChanged(CharSequence s, int start, int before, int count) {
    
                }
    
                @Override
                public void afterTextChanged(Editable s) {
    
                }
            });
    
    //        按回车触发事件
            editText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
                @Override
                public boolean onEditorAction(TextView v, int actionId, KeyEvent event) {
    
                    Toast.makeText(MainActivity.this, v.getText(), Toast.LENGTH_SHORT).show();
    
                    return true;
                }
            });
    
        }