이전수업에 했던것

package com.example.administrator.myapplication;
 
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
 
public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    TextView txt1;
    TextView edit;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        txt1 = (TextView) findViewById(R.id.txt1);
 
        txt1.setText(" Hi jinsil");
 
        Button button = (Button) findViewById(R.id.button);
        button.setText("로그인");
 
        button.setOnClickListener(this);
 
        edit = (TextView) findViewById(R.id.edit);
        edit.setHint("수정");
    }
 
 
    @Override
    public void onClick(View v) {
 
        String str;
        str = edit.getText().toString();
//        txt1.setText(str);
//        edit.setText("");
//        Log.d("fff", str);
 
        int input = Integer.parseInt(str);
        String str2 = "";
        if (1 < input && input < 10) {
            for (int i = 2; i < 10; i++) {
                for (int j = 1; j < 10; j++) {
                    if (input == i) {
                        str2 = str2 + i + "x" + j + "=" + i * j + "\n";
                    }
                }
            }
        } else {
            txt1.setText("2~9까지의 숫자를 적어주세요.");
        }
        txt1.setText(str2);
    }
 
}
 

밑은 xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.administrator.myapplication">
 
    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
 
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
 
</manifest>