سلام تمام دستورات رو درست نوشتم اما وقتی کلاس رو فراخوانی میکنم و نتیجه رو به یک شی متنی میدم برنامه ارور میده لطفا راهنمایی کنید
main activity
class
کد:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.ali.myapplication" >
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MyActivity"
android:label="@string/app_name">
<intent-filter >
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".c1"
android:label="c1"></activity>
</application>
</manifest>کد:
package com.example.ali.myapplication;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MyActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
final c1 fer=new c1();
Button b22=(Button)findViewById(R.id.btn1);
b22.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
TextView t1=(TextView)findViewById(R.id.txt2);
t1.setText(fer.c1(4,5));
}
});
//t1.setText( fer.r1(8,10));
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.my, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}کد:
package com.example.ali.myapplication;
/**
* Created by Ali on 10/3/2016.
*/
public class c1 extends MyActivity {
private int a;
private int b;
public int c1 (int c,int d){
b=d;
a=c;
return (a*b);
}
}