Error:(16, 47) 错误: 不兼容的类型: View无法转换为Button

Question

小白求助0.0
Error:(10, 36) 错误: 找不到符号
符号: 类 OnClickListener
位置: 类 Button
Error:(16, 47) 错误: 不兼容的类型: View无法转换为Button
Error:Execution failed for task ':app:compileDebugJavaWithJavac'.

Compilation failed; see the compiler error output for details.

以下是Android studio编写的activity

 package com.example.activitytest;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

import static com.example.activitytest.R.*;

public class FirstActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(layout.first_layout);
        Button button1 = (Button) findViewById(R.id.button_1);
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(FirstActivity.this, "You clicked Button 1",
                        Toast.LENGTH_SHORT).show();
            }
        });
    }
}

Answer 1

我想应该是你的布局文件导入错了，应该写成：

setContentView(R.layout.first_layout);