如果edittext包含该单词，如何为部分android文本着色 [英] How to color part of android text if edittext contains that word

问题描述

只要用户在edittext中键入house，我就会尝试为单词（house）着色。这就是我所做的：

I'm trying to color a word (house) as long as user types "house" in the edittext. This is what I've done:

if (textA.getText().toString().equals("house")){
    String name = String.valueOf(textA.getText().toString().equals("house"));
    name.setTextColor(Color.parseColor("#bdbdbd"));
}

我的xml如下

<LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:layout_marginRight="15dp"
                    android:layout_marginEnd="15dp"
                    android:orientation="vertical"
                    android:padding="5dp">


                    <EditText
                        android:id="@+id/textA"
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:layout_marginTop="5dp"
                        android:inputType="textMultiLine"
                        android:maxLines ="4"
                        android:maxLength ="2000"
                        android:textColorHint="@color/grey"
                        android:background="@android:color/transparent"
                        android:gravity="top"/>

                </LinearLayout>

然而这会导致应用程序崩溃。不知道它是什么我做错了。我是android的新手。有什么建议吗？

however this causes the app to crash. Dont know what it is I'm doing wrong. I'm new to android. Any advice please?

推荐答案

这对我有用

this works for me

 textA.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) {
            String str="home";
            Spannable spannable =textA.getText();
            if(s.length() != 0) {
                textA.setTextColor(Color.parseColor("#0000FF"));
                ForegroundColorSpan fcs = new ForegroundColorSpan( Color.GREEN);
                String s1 = s.toString();
                int in=0; // start searching from 0 index

// keeps on searching unless there is no more function string found
                while ((in = s1.indexOf(str,in)) >= 0) {
                    spannable.setSpan(
                            fcs,
                            in,
                            in + str.length(),
                            Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
                    // update the index for next search with length
                    in += str.length();
                }
            }
        }

        @Override
        public void afterTextChanged(Editable s) {

        }
    });

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