次の方法で Web ページを外部ストレージに保存しようとしています。
public void saveWebPage(String url, String fileName){
try {
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
HttpResponse response;
response = httpClient.execute(httpGet);
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null){
sb.append(line + "\n");
}
String resString = sb.toString();
is.close();
File file = new File(Environment.getExternalStorageDirectory().toString() + "/Android/data/com.whizzapps.stpsurniki/" + fileName + ".html");
file.createNewFile();
FileOutputStream f1 = new FileOutputStream(file, false);
PrintStream p = new PrintStream(f1);
p.print(resString);
p.close();
f1.close();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
メソッドを呼び出すと、アプリがクラッシュし、これが logcat です。
09-09 17:26:22.304: E/AndroidRuntime(14507): FATAL EXCEPTION: main
09-09 17:26:22.304: E/AndroidRuntime(14507): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.whizzapps.stpsurniki/com.whizzapps.stpsurniki.Scheudele}: android.os.NetworkOnMainThreadException
09-09 17:26:22.304: E/AndroidRuntime(14507): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
09-09 17:26:22.304: E/AndroidRuntime(14507): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261)
09-09 17:26:22.304: E/AndroidRuntime(14507): at android.app.ActivityThread.access$600(ActivityThread.java:141)
09-09 17:26:22.304: E/AndroidRuntime(14507): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256)
09-09 17:26:22.304: E/AndroidRuntime(14507): at android.os.Handler.dispatchMessage(Handler.java:99)
09-09 17:26:22.304: E/AndroidRuntime(14507): at android.os.Looper.loop(Looper.java:137)
09-09 17:26:22.304: E/AndroidRuntime(14507): at android.app.ActivityThread.main(ActivityThread.java:5103)
09-09 17:26:22.304: E/AndroidRuntime(14507): at java.lang.reflect.Method.invokeNative(Native Method)
09-09 17:26:22.304: E/AndroidRuntime(14507): at java.lang.reflect.Method.invoke(Method.java:525)
09-09 17:26:22.304: E/AndroidRuntime(14507): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
09-09 17:26:22.304: E/AndroidRuntime(14507): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
09-09 17:26:22.304: E/AndroidRuntime(14507): at dalvik.system.NativeStart.main(Native Method)
09-09 17:26:22.304: E/AndroidRuntime(14507): Caused by: android.os.NetworkOnMainThreadException
09-09 17:26:22.304: E/AndroidRuntime(14507): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1133)
09-09 17:26:22.304: E/AndroidRuntime(14507): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
09-09 17:26:22.304: E/AndroidRuntime(14507): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
09-09 17:26:22.304: E/AndroidRuntime(14507): at java.net.InetAddress.getAllByName(InetAddress.java:214)
09-09 17:26:22.304: E/AndroidRuntime(14507): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
09-09 17:26:22.304: E/AndroidRuntime(14507): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
09-09 17:26:22.304: E/AndroidRuntime(14507): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
09-09 17:26:22.304: E/AndroidRuntime(14507): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
09-09 17:26:22.304: E/AndroidRuntime(14507): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
09-09 17:26:22.304: E/AndroidRuntime(14507): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
09-09 17:26:22.304: E/AndroidRuntime(14507): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
09-09 17:26:22.304: E/AndroidRuntime(14507): at com.whizzapps.stpsurniki.Scheudele.saveWebPage(Scheudele.java:135)
09-09 17:26:22.304: E/AndroidRuntime(14507): at com.whizzapps.stpsurniki.Scheudele.getWebView(Scheudele.java:66)
09-09 17:26:22.304: E/AndroidRuntime(14507): at com.whizzapps.stpsurniki.Scheudele.onCreate(Scheudele.java:50)
09-09 17:26:22.304: E/AndroidRuntime(14507): at android.app.Activity.performCreate(Activity.java:5133)
09-09 17:26:22.304: E/AndroidRuntime(14507): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
09-09 17:26:22.304: E/AndroidRuntime(14507): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175)
09-09 17:26:22.304: E/AndroidRuntime(14507): ... 11 more
これをUIスレッドに入れるように言われましたが、UIスレッドがコードのどの行にあるかわかりません。アクティビティ クラス ファイル内の他のメソッドの横に配置するだけです。
新しいコード:
private class downloadWebPage extends AsyncTask<String, Void, Void> {
@Override
protected Void doInBackground(String... params) {
try {
HttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
HttpResponse response;
response = httpClient.execute(httpGet);
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null){
sb.append(line + "\n");
}
String resString = sb.toString();
is.close();
File file = new File(Environment.getExternalStorageDirectory().toString() + "/Android/data/com.whizzapps.stpsurniki/" + fileName + ".html");
file.createNewFile();
FileOutputStream f1 = new FileOutputStream(file, false);
PrintStream p = new PrintStream(f1);
p.print(resString);
p.close();
f1.close();
} catch (ClientProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
}