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v0.1.3新增跳动文本
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‎app/src/main/AndroidManifest.xml‎

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<activity android:name=".meis.MeiRoseActivity"></activity>
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<activity android:name=".meis.MeiFireflyActivity"></activity>
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<activity android:name=".meis.MeiPraiseActivity"></activity>
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<activity android:name=".meis.MeiEvaporateActivity"></activity>
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</application>
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</manifest>

‎app/src/main/java/com/demo/widget/meis/MainActivity.java‎

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@@ -66,4 +66,8 @@ public void onFirefly(View view) {
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public void onPraise(View view) {
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startActivity(new Intent(this, MeiPraiseActivity.class));
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}
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public void onEva(View view) {
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startActivity(new Intent(this, MeiEvaporateActivity.class));
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}
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}

‎app/src/main/java/com/demo/widget/meis/MeiEvaporateActivity.java‎

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package com.demo.widget.meis;
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import android.os.Bundle;
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import android.support.annotation.Nullable;
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import android.support.v7.app.AppCompatActivity;
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import android.support.v7.widget.Toolbar;
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import android.view.View;
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import android.widget.Button;
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import com.demo.widget.R;
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import com.meis.widget.evaporate.EvaporateTextView;
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/**
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* Created by wenshi on 2018/11/23.
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* Description
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*/
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public class MeiEvaporateActivity extends AppCompatActivity {
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private Toolbar mToolbar;
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private EvaporateTextView mEvaporateTextView;
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private Button mBtn;
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private int index = 0;
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@Override
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protected void onCreate(@Nullable Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.mei_evaporate_activity);
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mToolbar = findViewById(R.id.toolbar);
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mToolbar.setNavigationOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View v) {
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finish();
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}
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});
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mEvaporateTextView = findViewById(R.id.etv);
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mBtn = findViewById(R.id.btn);
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mBtn.setOnClickListener(new View.OnClickListener() {
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@Override
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public void onClick(View v) {
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if (index >= (sentences.length - 1)) {
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index = 0;
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}
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mEvaporateTextView.animateText(sentences[index++]);
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}
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});
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mEvaporateTextView.animateText("hello world");
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}
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private String[] sentences = {
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"A material",
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"metaphor is the unifying theory",
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"of a rationalized space and a system of motion",
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"material",
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"grounded",
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"in tactile reality",
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"inspired",
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"study of paper and ink",
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"understand",
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"new affordances",
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"The fundamentals of light, surface, and movement are key to conveying how objects move",
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"interact",
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"divides space",
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"fundamentals",
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"欢迎关注文淑",
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"文淑博客",
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"Android"
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};
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}

‎app/src/main/res/layout/mei_evaporate_activity.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
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xmlns:app="http://schemas.android.com/apk/res-auto"
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android:layout_width="match_parent"
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android:layout_height="match_parent">
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<android.support.v7.widget.Toolbar
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android:id="@+id/toolbar"
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:background="@color/colorPrimary"
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app:navigationIcon="@mipmap/ic_arrow_back_white_24dp"
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app:title="Evaporate文本"
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app:titleTextColor="#FFF" />
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<com.meis.widget.evaporate.EvaporateTextView
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android:id="@+id/etv"
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android:layout_width="match_parent"
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android:layout_height="100dp"
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android:background="#000"
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android:gravity="center_horizontal"
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android:paddingTop="8dp"
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android:textColor="#fff"
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android:textSize="20sp"
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app:layout_constraintTop_toBottomOf="@+id/toolbar" />
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<Button
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android:id="@+id/btn"
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android:layout_width="match_parent"
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android:layout_height="48dp"
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android:background="@color/colorPrimary"
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android:gravity="center"
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android:text="切换文本"
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android:textColor="#fff"
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android:textSize="16sp"
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app:layout_constraintBottom_toBottomOf="parent"
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app:layout_constraintTop_toTopOf="parent" />
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</android.support.constraint.ConstraintLayout>

‎app/src/main/res/layout/meis_activity.xml‎

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</android.support.v7.widget.CardView>
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<android.support.v7.widget.CardView
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android:id="@+id/cv_eva"
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:layout_marginLeft="8dp"
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android:layout_marginRight="8dp"
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android:layout_marginTop="16dp"
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android:foreground="?attr/selectableItemBackground"
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android:onClick="onEva"
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app:cardBackgroundColor="@android:color/white"
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app:cardPreventCornerOverlap="false"
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app:cardUseCompatPadding="true">
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<TextView
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android:layout_width="match_parent"
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android:layout_height="wrap_content"
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android:gravity="center"
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android:padding="16dp"
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android:text="跳动的文本"
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android:textAllCaps="false"
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android:textColor="#999999"
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android:textSize="16sp" />
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</android.support.v7.widget.CardView>
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</LinearLayout>
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</android.support.v4.widget.NestedScrollView>
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</LinearLayout>

‎widget/src/main/java/com/meis/widget/evaporate/CharacterDiffResult.java‎

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package com.meis.widget.evaporate;
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/**
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* Created by wenshi on 2018/11/22.
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* Description
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*/
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public class CharacterDiffResult {
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public char c;
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public int fromIndex;
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public int moveIndex;
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}

‎widget/src/main/java/com/meis/widget/evaporate/CharacterUtils.java‎

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package com.meis.widget.evaporate;
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import java.util.ArrayList;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Set;
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/**
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* Created by wenshi on 2018/11/23.
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* Description
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*/
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public class CharacterUtils {
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public static List<CharacterDiffResult> diff(CharSequence oldText, CharSequence newText) {
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List<CharacterDiffResult> differentList = new ArrayList<>();
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Set<Integer> skip = new HashSet<>();
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for (int i = 0; i < oldText.length(); i++) {
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char c = oldText.charAt(i);
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for (int j = 0; j < newText.length(); j++) {
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if (!skip.contains(j) && c == newText.charAt(j)) {
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skip.add(j);
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CharacterDiffResult different = new CharacterDiffResult();
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different.c = c;
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different.fromIndex = i;
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different.moveIndex = j;
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differentList.add(different);
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break;
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}
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}
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}
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return differentList;
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}
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public static int needMove(int index, List<CharacterDiffResult> differentList) {
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for (CharacterDiffResult different : differentList) {
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if (different.fromIndex == index) {
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return different.moveIndex;
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}
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}
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return -1;
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}
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public static boolean stayHere(int index, List<CharacterDiffResult> differentList) {
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for (CharacterDiffResult different : differentList) {
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if (different.moveIndex == index) {
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return true;
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}
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}
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return false;
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}
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// 计算x坐标的位置
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public static float getOffset(int from, int move, float progress, float startX, float oldStartX,
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List<Float> gaps, List<Float> oldGaps) {
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float dist = startX;
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for (int i = 0; i < move; i++) {
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dist += gaps.get(i);
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}
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float cur = oldStartX;
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for (int i = 0; i < from; i++) {
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cur += oldGaps.get(i);
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}
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return cur + (dist - cur) * progress;
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}
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}

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