jj97181818/Ch06_EnergyCalculator
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finish the java code

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jj97181818
2018-11-14 13:51:20 +08:00
parent 6e8cdacbdf
commit e99c91fa9f
11 changed files with 127 additions and 38 deletions
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@ -0,0 +1,6 @@
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106
.idea/workspace.xml generated
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@ -11,7 +11,12 @@
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@ -32,13 +37,13 @@
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@ -52,17 +57,20 @@
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@ -2324,20 +2332,22 @@
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@ -2360,8 +2370,8 @@
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@ -2495,48 +2505,63 @@
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app/src/main/java/me/jj97181818/ch06_energycalculator/MainActivity.java
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@ -2,12 +2,63 @@ package me.jj97181818.ch06_energycalculator;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener, AdapterView.OnItemSelectedListener {
double[] energyRate = {3.1, 4.4, 13.2, 9.7, 5.1, 3.7};
EditText weight, time;
TextView total, txvRate;
Spinner sports;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//設定初值
weight = findViewById(R.id.weight);
time = findViewById(R.id.timeSpan);
total = findViewById(R.id.total);
txvRate = findViewById(R.id.txvRate);
sports = findViewById(R.id.sports);
//註冊監聽器
sports.setOnItemSelectedListener(this);
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
txvRate.setText(String.valueOf(energyRate[position]));
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
public void calc(View v) {
String w = weight.getText().toString();
String t = time.getText().toString();
if (w.isEmpty() || w.equals(".") || t.isEmpty() || t.equals(".")) {
total.setText("請輸入體重及運動時間");
return;
}
int pos = sports.getSelectedItemPosition();
long kcal = Math.round(energyRate[pos] * Double.parseDouble(w) * Double.parseDouble(t));
total.setText(String.format("消耗能量 %d 仟卡", kcal));
}
}