Android BMI計算範例
先上範例圖片 :
第一頁
第二頁
第三頁
程式碼的部分 :
第一頁的xml :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="25dp"
tools:context="tw.com.hjchen.intentbmi.MainActivity"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="身高 : "
android:padding="15dp"
android:textSize="25sp"
android:textColor="#66B3FF"/>
<EditText
android:id="@+id/edtheight"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="體重 : "
android:padding="15dp"
android:textSize="25sp"
android:textColor="#66B3FF"/>
<EditText
android:id="@+id/edtweight"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<Button
android:id="@+id/btn01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="BMI計算"
android:textSize="25sp"/>
</LinearLayout>
第一頁.java :
public class MainActivity extends AppCompatActivity {
private EditText edtheight,edtweight;
private Button btn01;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
findViews();
}
private void findViews(){
edtheight = (EditText)findViewById(R.id.edtheight);
edtweight = (EditText)findViewById(R.id.edtweight);
btn01 = (Button)findViewById(R.id.btn01);
btn01.setOnClickListener(btn01OnClickListner);
}
private Button.OnClickListener btn01OnClickListner = new Button.OnClickListener(){
public void onClick(View view){
try {
double height = Double.parseDouble(edtheight.getText().toString());
double weight = Double.parseDouble(edtweight.getText().toString());
Intent it = new Intent();
it.setClass(MainActivity.this, Main2Activity.class);
Bundle bundle = new Bundle();
bundle.putDouble("height", height);
bundle.putDouble("weight", weight);
it.putExtras(bundle);
startActivity(it);
}catch (Exception e){
Toast.makeText(MainActivity.this,"輸入錯誤",Toast.LENGTH_SHORT).show();
}
}
};
}
第二頁.xml :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="25dp"
tools:context="tw.com.hjchen.intentbmi.Main2Activity"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="結果 : "
android:textSize="25sp"
android:padding="15dp"/>
<TextView
android:id="@+id/result"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="25sp"
android:padding="15dp"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:gravity="center_horizontal"
android:layout_marginTop="60dp">
<Button
android:id="@+id/btnback"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="重新計算"
android:textSize="25sp"
android:layout_weight="1"/>
<Button
android:id="@+id/btnnext"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="體位測量"
android:textSize="25sp"
android:layout_weight="1"/>
</LinearLayout>
</LinearLayout>
第二頁.java :
public class Main2Activity extends AppCompatActivity {
private Button btnback,btnnext;
private TextView txtresult;
double height,weight,bmi;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
findViews();
}
private void findViews(){
btnback = (Button)findViewById(R.id.btnback);
btnnext = (Button)findViewById(R.id.btnnext);
txtresult = (TextView)findViewById(R.id.result);
btnback.setOnClickListener(btnbackOnClickListener);
btnnext.setOnClickListener(btnnextOnClickListener);
Bundle bundle = getIntent().getExtras();
height = bundle.getDouble("height");
weight = bundle.getDouble("weight");
calculate();
}
private void calculate(){
bmi = weight/((height*height)/10000);
try{
if(bmi<18 .5="" ain2activity.this="" ain3activity.class="" bmi="" btnbackonclicklistener="new" btnnextonclicklistener="new" bundle2.putdouble="" bundle2="" bundle="" button.onclicklistener="" catch="" code="" e="" else="" finish="" height="" iew="" if="" intent="" it.putextras="" it.setclass="" it="" onclick="" private="" public="" startactivity="" txtresult.settext="" view="" void="" weight="" xception="">第三頁.xml :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="25dp"
tools:context="tw.com.hjchen.intentbmi.Main3Activity"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="身高 : "
android:textSize="25sp"
android:padding="15dp"/>
<TextView
android:id="@+id/txtheight"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="25sp"
android:padding="15dp"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="體重 : "
android:textSize="25sp"
android:padding="15dp"/>
<TextView
android:id="@+id/txtweight"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="25sp"
android:padding="15dp"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="性別 : "
android:textSize="25sp"
android:padding="15dp"/>
<EditText
android:id="@+id/sex"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="請輸入F或M"
android:gravity="center"
android:textSize="25sp"
android:textColorHint="#FF0000"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="腰圍 : "
android:textSize="25sp"
android:padding="15dp"/>
<EditText
android:id="@+id/waistline"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="請輸入腰圍"
android:gravity="center"
android:textSize="25sp"
android:textColorHint="#FF0000"/>
</LinearLayout>
<Button
android:id="@+id/btncalculate"
android:layout_width="150dp"
android:layout_height="wrap_content"
android:text="計算"
android:textSize="25sp"
android:layout_gravity="center"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="結果 : "
android:textSize="25sp"
android:padding="15dp"/>
<TextView
android:id="@+id/result"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="25sp"
android:padding="15dp"/>
</LinearLayout>
</LinearLayout>
第三頁.java :
public class Main3Activity extends AppCompatActivity {
private TextView txtheight,txtweight,txtresult;
private EditText sex,waistline;
private Button btncalculate;
private double height,weight;
private int intwaistline;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
findViews();
}
private void findViews(){
txtheight = (TextView)findViewById(R.id.txtheight);
txtweight = (TextView)findViewById(R.id.txtweight);
txtresult = (TextView)findViewById(R.id.result);
sex = (EditText)findViewById(R.id.sex);
waistline = (EditText)findViewById(R.id.waistline);
btncalculate = (Button)findViewById(R.id.btncalculate);
Bundle bundle = getIntent().getExtras();
height = bundle.getDouble("height");
String shieght = String.valueOf(height);
weight = bundle.getDouble("weight");
String sweight = String.valueOf(weight);
txtheight.setText(shieght);
txtweight.setText(sweight);
btncalculate.setOnClickListener(btncalculateListner);
}
private Button.OnClickListener btncalculateListner = new Button.OnClickListener(){
public void onClick(View view){
intwaistline = Integer.parseInt(waistline.getText().toString());
String ssex = sex.getText().toString();
switch (ssex){
case "F":
if(intwaistline<80 break="" case="" code="" default:="" else="" if="" intwaistline="" txtresult.settext="">
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