Android 利用正则+反射+SpannableString展示Emoji表情

Android 利用正则+反射+SpannableString展示Emoji表情

简单实现一下，仅供参考，先给一张图片~~

• 先说下实现的步骤
• 1.从输入的字符串中获取匹配emoji表情名称的子字符串
• 2.利用R.mipmap.class来找到该emoji名称对应的Rid
• 3.利用Rid获取到对应的Drawable
• 4.emoji Drawable转换成ImageSpan
• 5.将原字符串转换成SpannableString,并在读取到的Emoji位置把ImageSpan替换上去
• 6显示在TextView上即可

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• 1将众多emoji表情导入mipmap文件夹下，并且名称为“emoxxx”
• 2.布局如下，TextView 和EditText

<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="vertical"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity">    <TextView        android:id="@+id/tv"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:textSize="16sp"/>    <EditText        android:id="@+id/et"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_marginTop="20dp"        android:inputType="text"/></LinearLayout>

• 3.代码如下

public class MainActivity extends AppCompatActivity implements TextWatcher {    private TextView tv;    private EditText et;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        tv = (TextView) findViewById(R.id.tv);        et = (EditText) findViewById(R.id.et);        et.addTextChangedListener(this);    }    @Override    public void beforeTextChanged(CharSequence s, int start, int count, int after) {    }    @Override    public void onTextChanged(CharSequence s, int start, int before, int count) {        changeStrWithEmoji(s.toString());    }    @Override    public void afterTextChanged(Editable s) {    }    String TAG = "TAG";    public void changeStrWithEmoji(String input) {        //1.匹配字符串input中“[xxx]”        Pattern pattern = Pattern.compile("\\[[^\\[\\]]*\\]");        //2.获取匹配器        Matcher matcher = pattern.matcher(input);        //3.创建SP        SpannableString sp = new SpannableString(input);        //4.依次找到字符串input匹配到的子字符串        while (matcher.find()) {            //5.获取匹配到的子字符串[emoxxx]            String group = matcher.group();            //6.在该字符串开始的位置 与结束的位置            int start = matcher.start();            int end = matcher.end();            Log.d(TAG, group);            //7.获取 R.mipmap.class 实例            Class<R.mipmap> mipmapClass = R.mipmap.class;            try {                //8.去掉[emoxxx] 中括号查找 定义的变量                Field field = mipmapClass.getDeclaredField(group.substring(1, group.length() - 1));                //9 R.mipmap.class 定义的变量都是 static的 可直接获取                int rid = field.getInt(null);                Log.d(TAG, rid + "");                //10.获取该[emoxxx]对应的emo Drawable                Drawable drawable = getResources().getDrawable(rid);                drawable.setBounds(0, 0, drawable.getIntrinsicWidth(), drawable.getIntrinsicHeight());                //11.在指定的位置设置该 ImageSpan即可                sp.setSpan(new ImageSpan(drawable), start, end, Spannable.SPAN_INCLUSIVE_EXCLUSIVE);            } catch (Exception e) {                e.printStackTrace();            }        }        //12.显示出来        tv.setText(sp);    }}

• 完~~