在Android中键入动画效果

在本文中，我们将实现与TextView相关的非常重要的功能。此功能可用于在应用程序中显示重要的公告或通知。甚至我们都可以添加此功能，以向用户显示重要链接，因为这吸引了用户的注意。因此，在这里我们将学习如何实现该功能。下面给出了一个示例GIF，以了解我们将在本文中做些什么。注意，我们将使用Java语言实现该项目。

分步实施

步骤1：创建一个新项目

要在Android Studio中创建新项目，请参阅如何在Android Studio中创建/启动新项目。请注意，选择Java作为编程语言。

步骤2：使用activity_main.xml文件

导航到应用程序> res>布局> activity_main.xml，然后将以下代码添加到该文件中。以下是activity_main.xml文件的代码。

步骤3：使用MainActivity。 Java文件

转到MainActivity。 Java文件并参考以下代码。

// Here we are adding the first letter
new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        typingt.setText("G");
                    }
                },300);
                // After that we will be appending the next
                // letter after some time interval
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        typingt.append("e");
                    }
                },400);

以下是MainActivity的完整代码。 Java文件。

Java

import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
  
import androidx.appcompat.app.AppCompatActivity;
  
public class MainActivity extends AppCompatActivity {
      
    TextView typingt;
    Button typingb;
  
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
          
        typingb = findViewById(R.id.typingb);
        typingt = findViewById(R.id.typingt);
          
        typingb.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        typingt.setText("G");
                    }
                }, 300);
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        typingt.append("e");
                    }
                }, 400);
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        typingt.append("e");
                    }
                }, 500);
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        typingt.append("k");
                    }
                }, 600);
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        typingt.append("s");
                    }
                }, 700);
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        typingt.append("f");
                    }
                }, 800);
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        typingt.append("o");
                    }
                }, 900);
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        typingt.append("r");
                    }
                }, 1000);
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        typingt.append("G");
                    }
                }, 1100);
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        typingt.append("e");
                    }
                }, 1200);
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        typingt.append("e");
                    }
                }, 1300);
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        typingt.append("k");
                    }
                }, 1400);
                new Handler().postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        typingt.append("s");
                    }
                }, 1500);
            }
        });
    }
}

输出：