Android 天气预报 - 错误

Question

我已经使用此链接进行了天气预报

http://www.anddev.org/android_weather_forecast_ -_google_weather_api__-_full_source-t361.html。

我收到以下错误：

08-09 10:57:45.737: ERROR/AndroidRuntime(539): FATAL EXCEPTION: main
08-09 10:57:45.737: ERROR/AndroidRuntime(539): java.lang.RuntimeException: Unable to start activity ComponentInfo{org.anddev.android.weatherforecast/org.anddev.android.weatherforecast.WeatherForecast}: android.view.InflateException: Binary XML file line #55: Error inflating class org.anddev.android.weatherforecast.views.SingleWeatherInfoView
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at android.app.ActivityThread.access$1500(ActivityThread.java:117)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at android.os.Looper.loop(Looper.java:123)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at android.app.ActivityThread.main(ActivityThread.java:3683)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at java.lang.reflect.Method.invokeNative(Native Method)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at java.lang.reflect.Method.invoke(Method.java:507)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at dalvik.system.NativeStart.main(Native Method)
08-09 10:57:45.737: ERROR/AndroidRuntime(539): Caused by: android.view.InflateException: Binary XML file line #55: Error inflating class org.anddev.android.weatherforecast.views.SingleWeatherInfoView
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at android.view.LayoutInflater.createView(LayoutInflater.java:508)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:570)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at android.view.LayoutInflater.rInflate(LayoutInflater.java:623)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at android.view.LayoutInflater.inflate(LayoutInflater.java:408)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:207)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at android.app.Activity.setContentView(Activity.java:1657)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at org.anddev.android.weatherforecast.WeatherForecast.onCreate(WeatherForecast.java:36)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     ... 11 more
08-09 10:57:45.737: ERROR/AndroidRuntime(539): Caused by: java.lang.NoSuchMethodException: SingleWeatherInfoView(Context,AttributeSet)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at java.lang.Class.getMatchingConstructor(Class.java:643)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at java.lang.Class.getConstructor(Class.java:472)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     at android.view.LayoutInflater.createView(LayoutInflater.java:480)
08-09 10:57:45.737: ERROR/AndroidRuntime(539):     ... 21 more

这是我的 Xml 文件 main.xml

  <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
   android:orientation="vertical"
   android:layout_width="fill_parent"
   android:layout_height="fill_parent"
   android:background="@drawable/weather_background"
   >
    <TableLayout
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:stretchColumns="0"
        >
        <TableRow
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content">
                        <TextView  
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Usage like: 'City, Country'"
                        android:gravity="left"
                        />
                <CheckBox android:id="@+id/chk_usecelsius"  
                        android:layout_width="wrap_content"
                                android:layout_height="wrap_content"
                                android:text="Use °C (not °F)"
                                android:gravity="right"
                />
        </TableRow>
    </TableLayout>
    <TableLayout
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:stretchColumns="0"
        >
        <TableRow
                        android:layout_width="fill_parent"
                        android:layout_height="wrap_content">

                        <EditText android:id="@+id/edit_input"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="Schriesheim, Germany"
                        android:singleLine="true"
                        />
                <Button android:id="@+id/cmd_submit"
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content"
                        android:text="OK"
                />
        </TableRow>
    </TableLayout>

    <org.anddev.android.weatherforecast.views.SingleWeatherInfoView
        android:id="@+id/weather_today"
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center_horizontal"
        android:paddingTop="15px"
        />
    <TableLayout
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:stretchColumns="0,1,2,3"
        android:paddingTop="15px"
        >
                <TableRow
                                android:layout_width="fill_parent"
                                android:layout_height="wrap_content">
                        <org.anddev.android.weatherforecast.views.SingleWeatherInfoView
                                android:id="@+id/weather_1"
                                android:layout_width="wrap_content"
                                android:layout_height="wrap_content"
                                android:gravity="center_horizontal"
                                android:orientation="vertical"
                                />
                        <org.anddev.android.weatherforecast.views.SingleWeatherInfoView
                                android:id="@+id/weather_2"
                                android:layout_width="wrap_content"
                                android:layout_height="wrap_content"
                                android:gravity="center_horizontal"
                                android:orientation="vertical"
                                />
                        <org.anddev.android.weatherforecast.views.SingleWeatherInfoView
                                android:id="@+id/weather_3"
                                android:layout_width="wrap_content"
                                android:layout_height="wrap_content"
                                android:gravity="center_horizontal"
                                android:orientation="vertical"
                                />
                        <org.anddev.android.weatherforecast.views.SingleWeatherInfoView
                                android:id="@+id/weather_4"
                                android:layout_width="wrap_content"
                                android:layout_height="wrap_content"
                                android:gravity="center_horizontal"
                                android:orientation="vertical"
                                />
                        </TableRow>
    </TableLayout>

，这是我的类文件

public class SingleWeatherInfoView extends LinearLayout {


    private ImageView myWeatherImageView = null;
    private TextView myTempTextView = null;

    public SingleWeatherInfoView(Context context) {
        super(context);
    }

    public SingleWeatherInfoView(Context context, AttributeSet attrs,
             Map inflateParams) {


        super(context, attrs);
        /* Setup the ImageView that will show weather-icon. */
        this.myWeatherImageView = new ImageView(context);
        this.myWeatherImageView.setImageDrawable(getResources().getDrawable(
                R.drawable.dunno));

        /* Setup the textView that will show the temperature. */
        this.myTempTextView = new TextView(context);
        this.myTempTextView.setText("? °C");
        this.myTempTextView.setTextSize(16);
        this.myTempTextView.setTypeface(Typeface
                .create("Tahoma", Typeface.BOLD));

        /* Add child views to this object. */
        this.addView(this.myWeatherImageView, new LinearLayout.LayoutParams(
                LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
        this.addView(this.myTempTextView, new LinearLayout.LayoutParams(
                LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
    }


    public void reset() {
        this.myWeatherImageView.setImageDrawable(getResources().getDrawable(
                R.drawable.dunno));
        this.myTempTextView.setText("? °C");
    }

    /** Sets the Child-ImageView of this to the URL passed. */
    public void setRemoteImage(URL aURL) {
        try {
            URLConnection conn = aURL.openConnection();
            conn.connect();
            InputStream is = conn.getInputStream();
            BufferedInputStream bis = new BufferedInputStream(is);
            Bitmap bm = BitmapFactory.decodeStream(bis);
            bis.close();
            is.close();
            this.myWeatherImageView.setImageBitmap(bm);
        } catch (IOException e) {
            /* Reset to 'Dunno' on any error. */
            this.myWeatherImageView.setImageDrawable(getResources()
                    .getDrawable(R.drawable.dunno));
        }
    }

    public void setTempCelcius(int aTemp) {
        this.myTempTextView.setText("" + aTemp + " °C");
    }

    public void setTempFahrenheit(int aTemp) {
        this.myTempTextView.setText("" + aTemp + " °F");
    }

    public void setTempFahrenheitMinMax(int aMinTemp, int aMaxTemp) {
        this.myTempTextView.setText("" + aMinTemp + "/" + aMaxTemp + " °F");
    }

    public void setTempCelciusMinMax(int aMinTemp, int aMaxTemp) {
        this.myTempTextView.setText("" + aMinTemp + "/" + aMaxTemp + " °C");
    }

    public void setTempString(String aTempString) {
        this.myTempTextView.setText(aTempString);
    }
}

导致这些错误的原因是什么？

Answer 1

1. 只需将“Setup ImageView...”之后的所有逻辑移动到一个新方法 init(...) 中，并从移动逻辑的位置调用它。

2. 创建
   公共 SingleWeatherInfoView（上下文上下文，AttributeSet attrs）{
   超级（上下文，属性）；
   初始化（...）；
   }

Answer 2

您正在使用的 SingleWeatherInfoView 类似乎无法正确支持 XML 膨胀。您应该尝试从代码而不是 XML 创建它的实例，看看是否有效。

Answer 3

我遇到了同样的问题，我犯的错误是在 ma​​in.xml 中为包 SingleWeatherInfoView 添加了错误的地址：

com.beach.alpha.SingleWeatherInfoView 

请确保您的项目具有此路径。