setContentView( R.layout.main) can not resolve symbol R

Question

1 如题

2package com.example.lenovoofleo.myapplication;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);//报错
    }
}

3.Error:Execution failed for task ':app:processDebugResources'.

com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'H:Andriod_StudionewSdkfromASbuild-tools19.1.0aapt.exe'' finished with non-zero exit value 1

4.试过的方法很多，就不贴出了

Answer 1

执行AAPT的时候出了问题，导致资源文件没有正确生成，也就自然找不到R类了。建议你更新或者重新替换一下Android SDK。