EditText记录

1. 带删除按钮到EditText

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.CycleInterpolator;
import android.view.animation.TranslateAnimation;
import android.widget.EditText;

import com.example.huangjunjie.myapplication3.R;

/**
 * Created by huangjunjie on 15-1-3.
 */
public class ClearEditText extends EditText implements View.OnFocusChangeListener, TextWatcher {
    /** * 删除按钮的引用 */
    private Drawable mClearDrawable;
    public ClearEditText(Context context) {
        this(context, null);
    }
    public ClearEditText(Context context, AttributeSet attrs) {
//这里构造方法也很重要，不加这个很多属性不能再XML里面定义
        this(context, attrs, android.R.attr.editTextStyle);
    }
    public ClearEditText(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }
    private void init() {
//获取EditText的DrawableRight,假如没有设置我们就使用默认的图片
        mClearDrawable = getCompoundDrawables()[2];
        if (mClearDrawable == null) {
            mClearDrawable = getResources() .getDrawable(R.drawable.icon_clear_edittext);
        }
        mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight());
        setClearIconVisible(false);
        setOnFocusChangeListener(this);
        addTextChangedListener(this);
    }
    /** * 因为我们不能直接给EditText设置点击事件，所以我们用记住我们按下的位置来模拟点击事件 * 当我们按下的位置 在 EditText的宽度 - 图标到控件右边的间距 - 图标的宽度 和 * EditText的宽度 - 图标到控件右边的间距之间我们就算点击了图标，竖直方向没有考虑 */
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (getCompoundDrawables()[2] != null) {
            if (event.getAction() == MotionEvent.ACTION_UP) {
                boolean touchable = event.getX() > (getWidth() - getPaddingRight() - mClearDrawable.getIntrinsicWidth()) && (event.getX() < ((getWidth() - getPaddingRight())));
                if (touchable) {
                    this.setText("");
                }
            }
        }
        return super.onTouchEvent(event);
    }
    /** * 当ClearEditText焦点发生变化的时候，判断里面字符串长度设置清除图标的显示与隐藏 */
    @Override
    public void onFocusChange(View v, boolean hasFocus) {
        if (hasFocus) {
            setClearIconVisible(getText().length() > 0);
        } else {
            setClearIconVisible(false);
        }
    }
    /** * 设置清除图标的显示与隐藏，调用setCompoundDrawables为EditText绘制上去 * @param visible */
    protected void setClearIconVisible(boolean visible) {
        Drawable right = visible ? mClearDrawable : null;
        setCompoundDrawables(getCompoundDrawables()[0], getCompoundDrawables()[1], right, getCompoundDrawables()[3]);
    }
    /** * 当输入框里面内容发生变化的时候回调的方法 */
    @Override
    public void onTextChanged(CharSequence s, int start, int count, int after) {
        setClearIconVisible(s.length() > 0);
    }
    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }
    @Override
    public void afterTextChanged(Editable s) {
    }
    /** * 设置晃动动画 */
    public void setShakeAnimation(){
        this.setAnimation(shakeAnimation(5));
    }
    /** * 晃动动画 * @param counts 1秒钟晃动多少下 * @return */
    public static Animation shakeAnimation(int counts){
        Animation translateAnimation = new TranslateAnimation(0, 10, 0, 0);
        translateAnimation.setInterpolator(new CycleInterpolator(counts));
        translateAnimation.setDuration(1000);
        return translateAnimation;
    }
}

2.EditText获取光标位置并插入字符删除字符

参考：http://blog.youkuaiyun.com/centralperk/article/details/8548075

1）获取光标位置

int index = editText.getSelectionStart(); 

2）在光标处插入字符

int index = editText.getSelectionStart();  
Editable editable = editText.getText();  
editable.insert(index, "aaaa");  

3）删除光标前字符

int index = editText.getSelectionStart();  
Editable editable = editText.getText();  
editable.delete(index-1, index);  

3.隐藏光标

转自：http://orgcent.com/android-edittext-cursor-position-focus/

EditText et = (EditText) findViewById(R.id.etTest);
//设置光标不显示,但不能设置光标颜色
et.setCursorVisible(false);

4.获得焦点时全选文本

EditText et = (EditText) findViewById(R.id.etTest);
et.setSelectAllOnFocus(true);

5.获取和失去焦点

EditText et = (EditText) findViewById(R.id.etTest);
et.requestFocus(); //请求获取焦点
et.clearFocus(); //清除焦点

6.设置不显示键盘

editText为目标控件

//set not display the keyboard
        try {
            Class<?> editTextClass = EditText.class;
            Method setShowInputMethod = editTextClass.getMethod("setShowSoftInputOnFocus",
                    boolean.class);
            try {
                setShowInputMethod.invoke(editText, false);
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            } catch (InvocationTargetException e) {
                e.printStackTrace();
            }
        } catch (NoSuchMethodException e) {
            e.printStackTrace();
        }

7.设置EditText最大可输入字符

http://blog.youkuaiyun.com/qqgrid/article/details/44301219