The method makeText(Context, CharSequence, int) in the type Toast is not applicable for the argument...
时间: 2024-03-10 18:43:43 浏览: 116
这个错误提示意味着你使用了错误的参数来调用Toast.makeText()方法。正确的方法签名是:
```java
public static Toast makeText(Context context, CharSequence text, int duration)
```
其中,第一个参数是应用程序的上下文,第二个参数是要显示的文本,第三个参数是Toast的持续时间。请确保你传递了正确的参数类型和值。如果你仍然遇到问题,请提供更多的代码以供参考。
相关问题
我要用Intent实现跳转,应该把代码加在哪?package com.example.afinal import android.content.Intent import android.view.View import android.view.ViewGroup import android.widget.ImageView import android.widget.TextView import androidx.recyclerview.widget.RecyclerView import android.view.LayoutInflater import android.widget.Toast class ContextAdapter(val contextList: List<ContextModel>) : RecyclerView.Adapter<ContextAdapter.ViewHolder>() { inner class ViewHolder(view: View) : RecyclerView.ViewHolder(view) { val contextCover: ImageView = view.findViewById(R.id.contextCover) val contextTitle: TextView = view.findViewById(R.id.contextTitle) } override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder { val view = LayoutInflater.from(parent.context).inflate(R.layout.home_context, parent, false) val viewHolder = ViewHolder(view) viewHolder.itemView.setOnClickListener { val position = viewHolder.adapterPosition val conetext = contextList[position] Toast.makeText(parent.context, "you clicked view ${conetext.title}", Toast.LENGTH_SHORT).show() } viewHolder.contextCover.setOnClickListener { val position = viewHolder.adapterPosition val context = contextList[position] Toast.makeText(parent.context, "you clicked image ${context.title}", Toast.LENGTH_SHORT).show() } return viewHolder } override fun onBindViewHolder(holder: ViewHolder, position: Int) { val context = contextList[position] holder.contextCover.setImageResource(context.coverUrl) holder.contextTitle.text = context.title holder.itemView.setOnClickListener { intent=Intent(this,DetailsActivity::class.java) } } override fun getItemCount() = contextList.size }
将跳转代码加在 onBindViewHolder 方法中。具体地,在 holder.itemView.setOnClickListener {} 中添加跳转代码,如下所示:
holder.itemView.setOnClickListener {
val intent = Intent(holder.itemView.context, DetailsActivity::class.java)
holder.itemView.context.startActivity(intent)
}
这样当用户点击某个列表项时,就会启动名为 "DetailsActivity" 的 Activity。记得事先在 AndroidManifest.xml 文件中声明这个 Activity。
优化这段代码if (strUserName.length() > 10) { Toast.makeText(RegisterActivityCIE21030.this, "用户名长度必须小于10!", Toast.LENGTH_SHORT).show(); } else if (strUserName.length() < 4) { Toast.makeText(RegisterActivityCIE21030.this, "用户名长度必须大于4!", Toast.LENGTH_SHORT).show(); } else if (strPassWord.length() > 16) { Toast.makeText(RegisterActivityCIE21030.this, "密码长度必须小于16!", Toast.LENGTH_SHORT).show(); } else if (strPassWord.length() < 6) { Toast.makeText(RegisterActivityCIE21030.this, "密码长度必须大于6!", Toast.LENGTH_SHORT).show(); } else if (!strPassWord.equals(strPassWordAgain)) { Toast.makeText(RegisterActivityCIE21030.this, "两次密码输入不一致!", Toast.LENGTH_SHORT).show(); } else { Toast.makeText(RegisterActivityCIE21030.this, "注册成功!", Toast.LENGTH_SHORT).show(); // 跳转到登录界面 Intent intent = new Intent(RegisterActivityCIE21030.this, MainActivityCEI21030.class); startActivity(intent); }
可以将重复的代码提取出来,使用一个方法来处理:
```
private void showToast(String message) {
Toast.makeText(RegisterActivityCIE21030.this, message, Toast.LENGTH_SHORT).show();
}
```
然后在代码中调用该方法:
```
if (strUserName.length() > 10) {
showToast("用户名长度必须小于10!");
} else if (strUserName.length() < 4) {
showToast("用户名长度必须大于4!");
} else if (strPassWord.length() > 16) {
showToast("密码长度必须小于16!");
} else if (strPassWord.length() < 6) {
showToast("密码长度必须大于6!");
} else if (!strPassWord.equals(strPassWordAgain)) {
showToast("两次密码输入不一致!");
} else {
showToast("注册成功!");
// 跳转到登录界面
Intent intent = new Intent(RegisterActivityCIE21030.this, MainActivityCEI21030.class);
startActivity(intent);
}
```
这样可以减少代码重复,使代码更加简洁易读。同时也方便后续维护和修改。
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