School, Bmi calculator, 18.02.2018

BMI Calculater  18.02.2018
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MainActivity.java
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package com.example.mohamadpc.bmiproject;

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

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    EditText etWeight, etHeight;
    Button btnCalculate;

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

        etHeight = (EditText) findViewById(R.id.etHeight);
        etWeight = (EditText) findViewById(R.id.etWeight);
        btnCalculate = (Button) findViewById(R.id.btnCalculate);

        btnCalculate.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        String w = etWeight.getText().toString();
        double weight = Double.parseDouble(w);

        double height = Double.parseDouble(etHeight.getText().toString());

        double bmi = weight / (height * height);

        //Toast.makeText(this, "bmi=" + bmi, Toast.LENGTH_LONG).show();

        Intent i = new Intent(this, ResultActivity.class);

        // send data bu intent
        i.putExtra("TheResult", bmi);

        startActivity(i);

    }
}


ResultActivity.java
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package com.example.mohamadpc.bmiproject;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;

public class ResultActivity extends AppCompatActivity {
    TextView tvBmi;
    TextView tvMessage;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_result);

        tvBmi = findViewById(R.id.tvBmi);
        tvMessage = findViewById(R.id.tvMessage);

        // get data from intent
        Intent i = this.getIntent();
        double bmi = i.getDoubleExtra("TheResult", 0);

        // display result
        tvBmi.setText("BMI = " + bmi);

        String message;
        if (bmi < 20) {
            message = "You need to eat more!";
        } else if (bmi < 25) {
            message = "Normal weight";
        } else if (bmi < 30) {
            message = "Over weight";
        } else if (bmi < 35) {
            message = "You should have a diet!";
        } else {
            message = "You should visit a doctor!";
        }

        tvMessage.setText(message);

    }
}


activity_main.xml
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#ecf454"
        android:gravity="center"
        android:text="Bmi Calculator"
        android:textColor="#f23333"
        android:textSize="32sp" />

    <EditText
        android:id="@+id/etWeight"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:gravity="center"
        android:hint="Weight (kg)"
        android:textSize="28sp" />

    <EditText
        android:id="@+id/etHeight"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:gravity="center"
        android:hint="Height (m)"
        android:textSize="28sp" />

    <Button
        android:id="@+id/btnCalculate"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Calculate BMI"
        android:textSize="22sp" />

</LinearLayout>

activity_result.xml
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<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <TextView
        android:id="@+id/tvBmi"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="stam dogma"
        android:textSize="32sp" />

    <TextView
        android:id="@+id/tvMessage"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="stam dogma"
        android:textSize="32sp" />

    <ImageView
        android:id="@+id/imgImage"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:background="@color/colorPrimary"
        android:gravity="center"
        android:scaleType="fitXY"
        android:src="@drawable/sun" />
</LinearLayout>