制作一个天气预报APP，要求 1.界面根据自己爱好布局，美观大方。 2.天气信息从“http://t.weather.sojson.com/api/weather/city/101180101”获得，最后的数字为城市编码。 3.主页面中有三个单选按钮（分别显示自己喜欢的三个城市名称）。 4.单击按钮，将城市编码作为参数传递到第二个界面，在第二个界面中显示所选城市的三天内的天气信息，每天至少显示日期、最高气温、最低气温和天气类型等信息。 5.获取网络数据在子线程中完成。用代码表示出来

以下是一个简单的天气预报APP的代码示例，具体实现可能需要根据需求进行修改：

MainActivity.java

public class MainActivity extends AppCompatActivity {

    private RadioGroup cityRadioGroup;

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

        cityRadioGroup = findViewById(R.id.city_radio_group);

        Button checkWeatherButton = findViewById(R.id.check_weather_button);
        checkWeatherButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int cityCode = getSelectedCityCode();
                Intent intent = new Intent(MainActivity.this, WeatherActivity.class);
                intent.putExtra("city_code", cityCode);
                startActivity(intent);
            }
        });
    }

    private int getSelectedCityCode() {
        switch (cityRadioGroup.getCheckedRadioButtonId()) {
            case R.id.beijing_radio_button:
                return 101010100;
            case R.id.shanghai_radio_button:
                return 101020100;
            case R.id.guangzhou_radio_button:
                return 101280101;
            default:
                return 101010100; // 默认为北京
        }
    }
}

activity_main.xml

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="16dp">

    <RadioGroup
        android:id="@+id/city_radio_group"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <RadioButton
            android:id="@+id/beijing_radio_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="北京" />

        <RadioButton
            android:id="@+id/shanghai_radio_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="上海" />

        <RadioButton
            android:id="@+id/guangzhou_radio_button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="广州" />
    </RadioGroup>

    <Button
        android:id="@+id/check_weather_button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="查看天气" />
</LinearLayout>

WeatherActivity.java

public class WeatherActivity extends AppCompatActivity {

    private TextView cityNameTextView;
    private TextView date1TextView;
    private TextView date2TextView;
    private TextView date3TextView;
    private TextView high1TextView;
    private TextView high2TextView;
    private TextView high3TextView;
    private TextView low1TextView;
    private TextView low2TextView;
    private TextView low3TextView;
    private TextView type1TextView;
    private TextView type2TextView;
    private TextView type3TextView;

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

        cityNameTextView = findViewById(R.id.city_name_text_view);
        date1TextView = findViewById(R.id.date1_text_view);
        date2TextView = findViewById(R.id.date2_text_view);
        date3TextView = findViewById(R.id.date3_text_view);
        high1TextView = findViewById(R.id.high1_text_view);
        high2TextView = findViewById(R.id.high2_text_view);
        high3TextView = findViewById(R.id.high3_text_view);
        low1TextView = findViewById(R.id.low1_text_view);
        low2TextView = findViewById(R.id.low2_text_view);
        low3TextView = findViewById(R.id.low3_text_view);
        type1TextView = findViewById(R.id.type1_text_view);
        type2TextView = findViewById(R.id.type2_text_view);
        type3TextView = findViewById(R.id.type3_text_view);

        int cityCode = getIntent().getIntExtra("city_code", 101010100); // 默认为北京
        new WeatherTask().execute(cityCode);
    }

    private class WeatherTask extends AsyncTask<Integer, Void, String> {

        @Override
        protected String doInBackground(Integer... params) {
            int cityCode = params[0];
            String url = "http://t.weather.sojson.com/api/weather/city/" + cityCode;
            try {
                URLConnection connection = new URL(url).openConnection();
                InputStream inputStream = connection.getInputStream();
                BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
                StringBuilder result = new StringBuilder();
                String line;
                while ((line = reader.readLine()) != null) {
                    result.append(line);
                }
                return result.toString();
            } catch (IOException e) {
                e.printStackTrace();
                return null;
            }
        }

        @Override
        protected void onPostExecute(String result) {
            if (result != null) {
                try {
                    JSONObject json = new JSONObject(result);
                    JSONObject city = json.getJSONObject("cityInfo");
                    String cityName = city.getString("city");
                    cityNameTextView.setText(cityName);

                    JSONArray forecast = json.getJSONArray("data");
                    if (forecast.length() >= 3) {
                        JSONObject day1 = forecast.getJSONObject(0);
                        JSONObject day2 = forecast.getJSONObject(1);
                        JSONObject day3 = forecast.getJSONObject(2);

                        date1TextView.setText(day1.getString("date"));
                        date2TextView.setText(day2.getString("date"));
                        date3TextView.setText(day3.getString("date"));

                        high1TextView.setText(day1.getString("high"));
                        high2TextView.setText(day2.getString("high"));
                        high3TextView.setText(day3.getString("high"));

                        low1TextView.setText(day1.getString("low"));
                        low2TextView.setText(day2.getString("low"));
                        low3TextView.setText(day3.getString("low"));

                        type1TextView.setText(day1.getString("type"));
                        type2TextView.setText(day2.getString("type"));
                        type3TextView.setText(day3.getString("type"));
                    }
                } catch (JSONException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

activity_weather.xml

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="16dp">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:id="@+id/city_name_text_view"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center"
            android:textSize="24sp" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:paddingTop="16dp"
            android:paddingBottom="16dp">

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="日期" />

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="最高气温" />

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="最低气温" />

            <TextView
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="天气类型" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:paddingTop="8dp"
            android:paddingBottom="8dp">

            <TextView
                android:id="@+id/date1_text_view"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1" />

            <TextView
                android:id="@+id/high1_text_view"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1" />

            <TextView
                android:id="@+id/low1_text_view"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1" />

            <TextView
                android:id="@+id/type1_text_view"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:paddingTop="8dp"
            android:paddingBottom="8dp">

            <TextView
                android:id="@+id/date2_text_view"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1" />

            <TextView
                android:id="@+id/high2_text_view"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1" />

            <TextView
                android:id="@+id/low2_text_view"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1" />

            <TextView
                android:id="@+id/type2_text_view"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1" />
        </LinearLayout>

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:paddingTop="8dp"
            android:paddingBottom="8dp">

            <TextView
                android:id="@+id/date3_text_view"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1" />

            <TextView
                android:id="@+id/high3_text_view"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1" />

            <TextView
                android:id="@+id/low3_text_view"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1" />

            <TextView
                android:id="@+id/type3_text_view"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1" />
        </LinearLayout>

    </LinearLayout>
</ScrollView>