EDITTEXT的Andr​​oid设置不变的某些部分 [英] set unchangeable some part of editText android

问题描述

我有一些EditText上的手机号码输入。应用程序必须为每个国家添加独特的文字。例如，对于亚美尼亚是必须添加 +374 ，和用户必须填写其他号码。此外 +374 必须是不变的，用户不能更改或删除它。那么，有没有某种方式这样做？

I have some EditText for mobile number input. App must add unique text for every country. For example for Armenia is must add +374 , and user must fill other numbers. Also +374 must be unchangeable, user can't change or remove it. So is there some kind of ways for doing this?

编辑：

我不希望使用的TextView或另一种观点认为这一文本，并把它留给了ediText的。我想找到某种方式以较少的运算。我需要的文字被冻结不检查每一个文本更改或添加缺少的文本时，用户会删除它的某些部分。

I don't want to use textView or another view with this text and put it left of the ediText. I want to find some way with less operations. I need text to be frozen not to check every text changes or add missing text when user will delete some part of it.

推荐答案

创建一个自定义绘制类，这将有助于将文本转换为可绘制的。

Create a custom drawable class that will help to convert text into drawable.

public class TextDrawable extends Drawable {

private final String text;
private final Paint paint;

public TextDrawable(String text) {
    this.text = text;
    this.paint = new Paint();
    paint.setColor(Color.BLACK);
    paint.setTextSize(16f);
    paint.setAntiAlias(true);
    paint.setTextAlign(Paint.Align.LEFT);
}

@Override
public void draw(Canvas canvas) {
    canvas.drawText(text, 0, 6, paint);
}

@Override
public void setAlpha(int alpha) {
    paint.setAlpha(alpha);
}

@Override
public void setColorFilter(ColorFilter cf) {
    paint.setColorFilter(cf);
}

@Override
public int getOpacity() {
    return PixelFormat.TRANSLUCENT;
}
}

然后设置绘制到左的EditText为

Then set the drawable to left of the edittext as

EditText et = (EditText)findViewById(R.id.editText1);
String code = "+374";
et.setCompoundDrawablesWithIntrinsicBounds(new TextDrawable(code), null, null, null);
et.setCompoundDrawablePadding(code.length()*10);

凡的EditText在布局文件中定义为

Where the edittext is defined in the layout file as

<EditText
android:id="@+id/editText1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:textSize="16sp"
android:ems="10" >
  <requestFocus />
</EditText>

最终输出看起来像

Final Output looks like

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