如何在点击时清除EditText？

Question

在Android中如何EditText在点击时清楚地表明？

例如,如果我有EditText一些字符,例如'Enter Name',当用户点击它时,这些字符就会消失.

Answer 1

我不确定你是否在此之后,但试试这个XML:

android:hint="Enter Name"

当输入字段为空,选中或未选中时,它会显示该文本.

或者,如果您希望它完全按照您的描述执行,请在editText上分配onClickListener并使用setText()将其设置为空.

Answer 2

您是否正在寻找类似于x的行为,该行为显示在iPhone上文本字段的右侧,在点按时会清除文本？它在那里被称为clearButtonMode.以下是如何在Android EditText视图中创建相同的功能:

String value = "";//any text you are pre-filling in the EditText

final EditText et = new EditText(this);
et.setText(value);
final Drawable x = getResources().getDrawable(R.drawable.presence_offline);//your x image, this one from standard android images looks pretty good actually
x.setBounds(0, 0, x.getIntrinsicWidth(), x.getIntrinsicHeight());
et.setCompoundDrawables(null, null, value.equals("") ? null : x, null);
et.setOnTouchListener(new OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if (et.getCompoundDrawables()[2] == null) {
            return false;
        }
        if (event.getAction() != MotionEvent.ACTION_UP) {
            return false;
        }
        if (event.getX() > et.getWidth() - et.getPaddingRight() - x.getIntrinsicWidth()) {
            et.setText("");
            et.setCompoundDrawables(null, null, null, null);
        }
        return false;
    }
});
et.addTextChangedListener(new TextWatcher() {
    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {
        et.setCompoundDrawables(null, null, et.getText().toString().equals("") ? null : x, null);
    }

    @Override
    public void afterTextChanged(Editable arg0) {
    }

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }
});

Answer 3

点击下面的任何动作后执行

((EditText) findViewById(R.id.yoursXmlId)).setText("");

要么

在XML文件中写这个

<EditText
---------- other stuffs ------ 
android:hint="Enter Name" /> 

它对我来说很好.希望你们所有人.

Answer 4

在Android中使用android调用提示:hint ="输入名称"

Answer 5

@ Harris的答案很棒,我已经将它实现为EditText的一个独立子类,如果你的代码已经添加了TextChangedListeners,它可以更容易使用.

此外,我已经调整了它,如果你已经使用任何复合Drawables,它会保持原样.

代码在这里,对于任何需要它的人:

package com.companyname.your

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.widget.EditText;

public class ClearableEditText extends EditText {

    public String defaultValue = "";
    final Drawable imgX = getResources().getDrawable(android.R.drawable.presence_offline ); // X image


    public ClearableEditText(Context context) {
        super(context);

        init();
    }

    public ClearableEditText(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        init();
    }

    public ClearableEditText(Context context, AttributeSet attrs) {
        super(context, attrs);

        init();
    }


    void init()  {

        // Set bounds of our X button
        imgX.setBounds(0, 0, imgX.getIntrinsicWidth(), imgX.getIntrinsicHeight());      

        // There may be initial text in the field, so we may need to display the button
        manageClearButton();

        this.setOnTouchListener(new OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {

                ClearableEditText et = ClearableEditText.this;

                // Is there an X showing?
                if (et.getCompoundDrawables()[2] == null) return false;
                // Only do this for up touches
                if (event.getAction() != MotionEvent.ACTION_UP) return false;
                // Is touch on our clear button?
                if (event.getX() > et.getWidth() - et.getPaddingRight() - imgX.getIntrinsicWidth()) {
                    et.setText("");
                    ClearableEditText.this.removeClearButton();
                }
                return false;
            }
        });

        this.addTextChangedListener(new TextWatcher() {
            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {

                ClearableEditText.this.manageClearButton();
            }

            @Override
            public void afterTextChanged(Editable arg0) {
            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
            }
        });
    }

    void manageClearButton() {
        if (this.getText().toString().equals("") )
            removeClearButton();
        else
            addClearButton();
    }
    void addClearButton() {
        this.setCompoundDrawables(this.getCompoundDrawables()[0], 
                this.getCompoundDrawables()[1],
                imgX,
                this.getCompoundDrawables()[3]);
    }
    void removeClearButton() {
        this.setCompoundDrawables(this.getCompoundDrawables()[0], 
                this.getCompoundDrawables()[1],
                null,
                this.getCompoundDrawables()[3]);
    }

}

Answer 6

如果您想在编辑文本中包含文本并将其删除,请尝试:

    final EditText text_box = (EditText) findViewById(R.id.input_box);
    text_box.setOnFocusChangeListener(new OnFocusChangeListener()
    {
        @Override
        public void onFocusChange(View v, boolean hasFocus) 
        {
            if (hasFocus==true)
            {
                if (text_box.getText().toString().compareTo("Enter Text")==0)
                {
                    text_box.setText("");
                }
            }
        }
    });

Answer 7

在设置文本的字段上使用onClick侦听器设置文本时要小心.我这样做并将文本设置为空字符串.这导致指针出现以指示我的光标所在的位置,这通常会在几秒钟后消失.当我离开我的页面导致finish()被调用之前我没有等待它消失时,它会导致内存泄漏并导致我的应用程序崩溃.我花了一些时间来弄清楚是什么导致了这个崩溃.

无论如何,如果可以,我建议在你的点击监听器而不是setText()中使用selectAll().这样,一旦选择了文本,用户就可以开始输入,并且将清除所有先前的文本.

可疑指针的图片:http://i.stack.imgur.com/juJnt.png