1)测量电流计内阻应注意什么?是否还有别的办法来测定电流计内阻?能否用欧 姆定律来进行测定?能否用电桥来进行测定?
时间: 2024-05-08 17:18:00 浏览: 125
以下是使用线性布局实现预测孩子身高的 Android App 的代码:
```
<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="wrap_content"
android:layout_height="wrap_content"
android:text="父亲身高(cm)" />
<EditText
android:id="@+id/height_father"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="母亲身高(cm)" />
<EditText
android:id="@+id/height_mother"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="number" />
<RadioGroup
android:id="@+id/gender_group"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<RadioButton
android:id="@+id/male"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="男孩" />
<RadioButton
android:id="@+id/female"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="女孩" />
</RadioGroup>
<Button
android:id="@+id/calculate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="预测" />
<TextView
android:id="@+id/result"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
```
在 MainActivity.java 中,处理计算和显示结果的代码如下:
```
public class MainActivity extends AppCompatActivity {
private EditText heightFatherEditText;
private EditText heightMotherEditText;
private RadioButton maleRadioButton;
private TextView resultTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
heightFatherEditText = findViewById(R.id.height_father);
heightMotherEditText = findViewById(R.id.height_mother);
maleRadioButton = findViewById(R.id.male);
resultTextView = findViewById(R.id.result);
findViewById(R.id.calculate).setOnClickListener(v -> {
double heightFather = Double.parseDouble(heightFatherEditText.getText().toString());
double heightMother = Double.parseDouble(heightMotherEditText.getText().toString());
String gender = maleRadioButton.isChecked() ? "男孩" : "女孩";
double heightChild;
if (maleRadioButton.isChecked()) {
heightChild = (heightFather + heightMother) * 0.54;
} else {
heightChild = (heightFather * 0.923 + heightMother) / 2;
}
String result = String.format("%s的预测身高为:%.2fcm", gender, heightChild);
resultTextView.setText(result);
});
}
}
```