安卓仿微信联系人快速索引 _仿微信

上下观古今，起伏千万途。这篇文章主要讲述安卓仿微信联系人快速索引相关的知识，希望能为你提供帮助。
半成品效果图：

文章图片

代码

import android.content.Context; import android.graphics.Canvas; import android.graphics.Paint; import android.support.annotation.Nullable; import android.util.AttributeSet; import android.view.MotionEvent; import android.view.View; import com.example.z.xxxx.R; /** * Created by z on 2017/9/21. */public class SlideBar extends View {private static final String[] BAR_LETTERS = {"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", "#"}; private Paint paint = new Paint(); private int selectIndex = -1; //选项的数组下标 private onTouchLetterListener onTouchLetterListener; private boolean isShowBkg = false; //背景是否变化public SlideBar(Context context) { super(context); }public SlideBar(Context context, @Nullable AttributeSet attrs) { super(context, attrs); }public SlideBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); }public interface onTouchLetterListener { void onTouchLetterChange(String letter,boolean touch); }public void setOnTouchLetterListener(onTouchLetterListener onTouchLetterListener) { this.onTouchLetterListener = onTouchLetterListener; }@Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); if (isShowBkg == true) { canvas.drawColor(getResources().getColor(R.color.text_backgroud_color)); //显示背景 } int height = getHeight(); int width = getWidth(); int singleHeight = (height - 20) / BAR_LETTERS.length; //每个字母占得高度 System.out.println(height + "-------" + width); for (int i = 0; i < BAR_LETTERS.length; i++) {//遍历字母paint.setColor(getResources().getColor(R.color.text_color)); paint.setTextSize(50); paint.setAntiAlias(true); //设置抗锯齿样式 System.out.println(i+"-----"+selectIndex); if (i == selectIndex) {//如果被选中 System.out.println(i+"*****"+selectIndex); paint.setColor(getResources().getColor(R.color.isread_true)); paint.setFakeBoldText(true); //加粗 } //从左下角开始绘制 float xpos = (width - paint.measureText(BAR_LETTERS[i])) / 2; //x轴 float ypos = singleHeight * i + singleHeight; //y轴（i从0开始算） //System.out.println(xpos + "< -------> " + ypos); canvas.drawText(BAR_LETTERS[i], xpos, ypos, paint); //开始绘制 paint.reset(); //重置画笔 }}@Override public boolean dispatchTouchEvent(MotionEvent event) { int action = event.getAction(); float ypos = event.getY(); int oldSelectIndex = selectIndex; //上一次触发的坐标 int newSelectIndex = (int) (ypos / getHeight() * BAR_LETTERS.length); //根据触摸的位置确定点的哪个字母switch (action) { case MotionEvent.ACTION_DOWN: isShowBkg = true; if (onTouchLetterListener != null & & oldSelectIndex != newSelectIndex & & newSelectIndex > = 0 & & newSelectIndex < = BAR_LETTERS.length) { onTouchLetterListener.onTouchLetterChange(BAR_LETTERS[newSelectIndex],true); //注册点击事件并传入字母 oldSelectIndex = newSelectIndex; selectIndex=newSelectIndex; invalidate(); //重新绘制} break; case MotionEvent.ACTION_UP:isShowBkg = false; selectIndex = -1; invalidate(); onTouchLetterListener.onTouchLetterChange(BAR_LETTERS[newSelectIndex],false); //注册点击事件并传入字母 break; case MotionEvent.ACTION_MOVE: if (onTouchLetterListener != null & & oldSelectIndex != newSelectIndex & & newSelectIndex > = 0 & & newSelectIndex < = BAR_LETTERS.length) { onTouchLetterListener.onTouchLetterChange(BAR_LETTERS[newSelectIndex],true); //注册点击事件并传入字母 oldSelectIndex = newSelectIndex; selectIndex=newSelectIndex; invalidate(); //重新绘制} break; }return true; }@Override public boolean onTouchEvent(MotionEvent event) { return super.onTouchEvent(event); } }

界面：

< ?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"> < include layout="@layout/item_toolbar"> < /include> < android.support.v4.widget.SwipeRefreshLayout android:id="@+id/srl_txl_list_main" android:layout_width="match_parent" android:layout_height="match_parent"> < RelativeLayout android:layout_width="match_parent" android:layout_height="match_parent"> < android.support.v7.widget.RecyclerView android:id="@+id/rcv_txl_list_main"android:layout_width="match_parent" android:layout_height="match_parent"> < /android.support.v7.widget.RecyclerView> < com.example.z.dlydbg.widget.slidebar.SlideBar android:id="@+id/slb_txl_main" android:layout_width="30dp" android:layout_height="match_parent" android:layout_alignParentRight="true" android:paddingBottom="10dp" android:paddingTop="10dp" /> < TextView android:id="@+id/tv_txl_list_flot" android:layout_width="100dp" android:layout_height="100dp" android:layout_centerHorizontal="true" android:layout_centerInParent="true" android:layout_centerVertical="true" android:background="@drawable/text_float_btn_background" android:gravity="center" android:text="V" android:textColor="@color/white" android:textSize="60sp" android:visibility="gone" /> < /RelativeLayout> < /android.support.v4.widget.SwipeRefreshLayout> < /LinearLayout>

activity：

public class TxlListActivity extends BaseActivity implements SlideBar.onTouchLetterListener {@BindView(R.id.toolbar) Toolbar toolbar; @BindView(R.id.slb_txl_main) SlideBar slbTxlMain; @BindView(R.id.tv_txl_list_flot) TextView tvTxlListFlot; @BindView(R.id.rcv_txl_list_main) RecyclerView rcvTxlListMain; @BindView(R.id.srl_txl_list_main) SwipeRefreshLayout srlTxlListMain; private String bmdm, bmmc; @Override public int getContentViewId() { return R.layout.activity_txl_list; }@Override public void initToolBar() { }@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); bmdm = getIntent().getExtras().getString("bmdm"); bmmc = getIntent().getExtras().getString("bmmc"); setToolBar(toolbar, bmmc, 0); slbTxlMain.setOnTouchLetterListener(this); }@Override public void onTouchLetterChange(String letter, boolean touch) { if (touch) { srlTxlListMain.setEnabled(false); //解决下拉冲突 tvTxlListFlot.setText(letter); tvTxlListFlot.setVisibility(View.VISIBLE); } else { srlTxlListMain.setEnabled(true); tvTxlListFlot.setVisibility(View.GONE); } } }

【安卓仿微信联系人快速索引】