Question

我已编写代码，但此代码无法从一个活动转移到另一个活动，有人可以帮我解决错误吗？当我在设备上安装应用程序时，它说不幸的是应用程序停止工作。这是代码。这是MainActivity文件

// Assumptions: 
//      col1, 5 and 6 is the intented unique key
//      each file includes a date in the filename

DECLARE @baseFilesLocation string = "input/base_{filedate}.txt";
DECLARE @deltaFilesLocation string = "input/delta_{filedate}.txt";


// Get the base files
@baseFiles =
    EXTRACT col1 int,
            col2 decimal,
            col3 decimal,
            col4 int,
            col5 int,
            col6 int,
            col7 int,
            filedate string

    FROM @baseFilesLocation
    USING Extractors.Text(delimiter : ' ');


// Get the delta files
@deltaFiles =
    EXTRACT col1 int,
            col2 decimal,
            col3 decimal,
            col4 int,
            col5 int,
            col6 int,
            col7 int,
            filedate string

    FROM @deltaFilesLocation
    USING Extractors.Text(delimiter : ' ', silent: true);


@working = 
    SELECT *
    FROM @baseFiles
    UNION ALL
    SELECT *
    FROM @deltaFiles;


// Work out the (col1, 5 and 6) and max filedate combination
@maxDates = 
    SELECT col1, col5, col6, MAX(filedate) AS filedate
    FROM @working
    GROUP BY col1, col5, col6;


// Join the original set (all base data, all delta files) to the max dates rowset, to get last record for each col1
@output = SELECT w.*
    FROM @working AS w
        SEMIJOIN @maxDates AS d ON w.col1 == d.col1
            AND w.col5 == d.col5
            AND w.col6 == d.col6
            AND w.filedate == d.filedate;


OUTPUT @output
    TO "/output/output.csv"
ORDER BY col1, col2, col3
USING Outputters.Csv();

这是SecondActivity代码

package com.example.lalit.activvity2;

import android.app.Activity;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class MainActivity extends Activity {
    Button b1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        b1 = (Button)findViewById(R.id.button1);

        b1.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,SecondActivity.class);
                startActivity(intent);
            }
        });
    }
}

请有人帮我解决如何解决错误的问题？

Answer 1

在清单文件中添加您的类名，如下所示：

<activity android:name=".SecondActivity"></activity>

Answer 2

在清单文件中添加您的班级

<activity android:name=".SecondActivity"></activity>

如果再次出现错误，则在评论中发布日志错误消息

如何从android中的一个actvitiy移动到另一个？

2 个答案: