dependencies {    ......    implementation 'com.william:JTCharIndexView:1.0.0'}

非常简单，懒得说明了，详见demopackage com.william.charindexviewdemoimport android.os.Bundleimport android.support.v7.app.AppCompatActivityimport android.widget.Toastimport com.william.charindexview.CharIndexViewimport kotlinx.android.synthetic.main.activity_main.*class MainActivity : AppCompatActivity() ,CharIndexView.OnCharIndexChangedListener{    override fun onCreate(savedInstanceState: Bundle?) {        super.onCreate(savedInstanceState)        setContentView(R.layout.activity_main)        val labels = charArrayOf('#','A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K',            'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z')        this.civ.setCHARS(labels)        this.civ.requestLayout()        this.civ.setOnCharIndexChangedListener(this)        this.civ.invalidate()    }    override fun onCharIndexSelected(currentIndex: String?) {        Toast.makeText(this,"点击了"+currentIndex,Toast.LENGTH_SHORT).show()    }}

Copyright 2018 william Inc.Licensed under the Apache License, Version 2.0 (the "License");you may not use this file except in compliance with the License.You may obtain a copy of the License at   http://www.apache.org/licenses/LICENSE-2.0Unless required by applicable law or agreed to in writing, softwaredistributed under the License is distributed on an "AS IS" BASIS,WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.See the License for the specific language governing permissions andlimitations under the License.