如何在Java中使用Java在动画中添加TextSwitcher和动画

TextSwitcher用于为屏幕上的文本设置动画。它是ViewSwitcher类的子类。它仅包含一个TextView类型的子级。为了在TextSwitcher上设置动画，我们必须添加动画标签，也可以以编程方式添加。这是TextSwitcher的一些用法：

• 在日期选择器中更改数字
  • 计时器倒计时

    TextSwitcher使用两种类型的动画：

    • 在动画中
    • 外出动画

    方法：

    1. 在activity_main.xml文件中添加以下代码。

    2. 现在，在MainActivity中添加以下代码。 Java文件。

       主要活动。Java

       package com.madhav.maheshwari.gfgTextSwitcher;
         
       import android.graphics.Color;
       import android.os.Bundle;
       import android.view.Gravity;
       import android.view.View;
       import android.widget.Button;
       import android.widget.TextSwitcher;
       import android.widget.TextView;
       import android.widget.ViewSwitcher;
         
       import androidx.appcompat.app.AppCompatActivity;
         
       public class MainActivity extends AppCompatActivity {
           private TextSwitcher textSwitcher;
           private Button nextButton;
           private int index = 0;
           private String[] arr
               = { "GeeksForGeeks", "A",
                   "Computer", "Science",
                   "Portal", "For",
                   "Geeks" };
           private TextView textView;
         
           @Override
           protected void onCreate(
               Bundle savedInstanceState)
           {
               super.onCreate(savedInstanceState);
               setContentView(R.layout.activity_main);
         
               textSwitcher = findViewById(R.id.textSwitcher);
               nextButton = findViewById(R.id.button);
               nextButton.setOnClickListener(
                   new View.OnClickListener() {
                       @Override
                       public void onClick(View v)
                       {
         
                           // when the text switcher
                           // reaches at the end
                           // of our array. It will
                           // be reset to 0.
                           if (index == arr.length - 1) {
                               index = 0;
                               textSwitcher.setText(arr[index]);
                           }
                           else {
                               textSwitcher.setText(arr[++index]);
                           }
                       }
                   });
         
               // Here we have to create
               // a TextView for our TextSwitcher
               textSwitcher.setFactory(
                   new ViewSwitcher.ViewFactory() {
                       @Override
                       public View makeView()
                       {
                           textView
                               = new TextView(
                                   MainActivity.this);
                           textView.setTextColor(
                               Color.parseColor("#219806"));
         
                           textView.setTextSize(40);
                           textView.setGravity(
                               Gravity.CENTER_HORIZONTAL);
                           return textView;
                       }
                   });
         
               // This is used to set the text
               // when app starts which is
               // at index i.e 0.
               textSwitcher.setText(arr[index]);
           }
       }
       

    输出：