Android实现文字消除效果

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:Android="Http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="44dp"
        android:text="百日不到处，青春恰自来。苔花如米小，也学牡丹开。"
        android:ellipsize="none"
        android:singleLine="true"
        android:background="#ff00ff"
        android:layout_marginTop="10dp"
        android:id="@+id/tv_text"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btn_click"
        android:text="点击清除"/>
        
  <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/btn_click1"
        android:text="点击恢复"/>
</LinearLayout>

android:ellipsize="none"
android:singleLine="true"

public class MainActivity extends AppCompatActivity {
    private TextView textView;
    private Button btn_click;
    private Button btn_click1;
    private Handler mHandler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mHandler = new Handler();
        textView = findViewById(R.id.tv_text);
        btn_click = findViewById(R.id.btn_click);
        btn_click1 = findViewById(R.id.btn_click1);
        btn_click.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showAsrAnim();
            }
        });

        btn_click1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                textView.setVisibility(View.VISIBLE);
                textView.setText("百日不到处，青春恰自来" +"苔花如米小，也学牡丹开。");
            }
        });
    }

    private void showAsrAnim() {
        mHandler.post(new Runnable() {
            @Override
            public void run() {
                //在这里我们利用ValueAnimator.ofInt创建了一个值从textView的宽度到2的动画，动画时长是400ms，然后让动画开始
                //第一步：创建ValueAnimator实例
                ValueAnimator animator = ValueAnimator.ofInt(textView.getWidth(), 2);
                animator.setInterpolator(new LinearInterpolator());
                animator.setDuration(4000);

                //第二步：添加监听
                animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
                    @Override
                    public void onAnimationUpdate(ValueAnimator animation) {
                        //获取ValueAnimator在运动时，当前运动点的值
                        int width = (int) animation.getAnimatedValue();
                        changeLayout(width);
                        if (width == 2) {
                            textView.setText("");
                            textView.setVisibility(View.INVISIBLE);
                            ViewGroup.LayoutParams params = textView.getLayoutParams();
                            params.width = ViewGroup.LayoutParams.WRAP_CONTENT;
                            textView.setLayoutParams(params);
                        }
                    }
                });
                animator.start();
            }
        });
    }

    private void changeLayout(int width) {
        ViewGroup.LayoutParams params = textView.getLayoutParams();
        params.width = width;
        textView.setLayoutParams(params);
    }}
}