除非删除此命令，否则我将获得例外：
android：targetSdkVersion =“ 15”
我在SO的另一个线程中发现了这一点。
但是，我已经在那里使用targetSdkVersion运行了几天。这是我的代码：
public class MainActivity extends BaseActivity {
private TextView textView;
private String url = "http://www.backcountryskiers.com/sac/sac-full.html";
private ImageView image;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
textView = (TextView) findViewById(R.id.todaysReport);
image = (ImageView) findViewById(R.id.dangerRose);
fetcher task = new fetcher();
task.execute();
}
public static Bitmap getBitmapFromURL(String src) {
try {
Log.e("src", src);
URL url = new URL(src);
HttpURLConnection connection = (HttpURLConnection) url
.openConnection();
connection.setDoInput(true);
connection.connect();
InputStream input = connection.getInputStream();
Bitmap myBitmap = BitmapFactory.decodeStream(input);
Log.e("Bitmap", "returned");
return myBitmap;
} catch (IOException e) {
e.printStackTrace();
Log.e("Exception", e.getMessage());
return null;
}
}
class fetcher extends AsyncTask<String, Void, String> {
private ProgressDialog dialog = new ProgressDialog(MainActivity.this);
private Document doc = null;
private Elements content = null;
private Document parse = null;
private String results = null;
private Element dangerRatingImg = null;
private String dangerRatingSrc = null;
private Bitmap bimage;
@Override
protected String doInBackground(String... params) {
try {
// bimage = getBitmapFromURL(drUrl);
doc = Jsoup.connect(url).get();
Log.e("Jsoup", "...is working...");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.e("Exception", e.getMessage());
}
content = doc.select("#content");
parse = Jsoup.parse(doc.html());
results = doc.select("#content").outerHtml();
return results;
}
@Override
protected void onPostExecute(String result) {
// smooth out the long scrolling...
textView.setMovementMethod(ScrollingMovementMethod.getInstance());
// find rating image...
dangerRatingImg = doc.select("img").first();
dangerRatingSrc = dangerRatingImg.absUrl("src");
// Get the rating image
bimage = getBitmapFromURL(dangerRatingSrc);
image.setImageBitmap(bimage);
image.setPadding(10, 10, 10, 10);
image.setScaleType(ScaleType.FIT_XY);
// return the summary
results = parse.select("#reportSummary").outerHtml();
textView.setText(Html.fromHtml(results));
textView.setPadding(10, 10, 10, 10);
// ditch the dialog, it's all loaded.
dialog.dismiss();
}
@Override
protected void onPreExecute() {
// before we get the async results show this
dialog.setMessage("Loading Latest Update from the Sierra Avalanche Center...");
dialog.show();
}
}
}
我已经建立了网络连接，可以看到将targetSdkVersion删除的结果很好...但是我知道那是不对的。谢谢大家。
编辑：
11-09 08:24:55.316: D/dalvikvm(9165): GC_CONCURRENT freed 148K, 3% free 11365K/11655K, paused 12ms+12ms, total 39ms
11-09 08:24:55.410: D/dalvikvm(9165): GC_CONCURRENT freed 331K, 5% free 11484K/11975K, paused 1ms+1ms, total 20ms
11-09 08:24:55.418: E/Jsoup(9165): ...is working...
11-09 08:24:55.558: D/dalvikvm(9165): GC_CONCURRENT freed 465K, 5% free 11506K/12103K, paused 12ms+12ms, total 39ms
11-09 08:24:55.558: E/src(9165): http://www.sierraavalanchecenter.org/sites/default/files/images/danger_icons_and_bars/0_nodangerrate.png
11-09 08:24:55.558: D/AndroidRuntime(9165): Shutting down VM
11-09 08:24:55.558: W/dalvikvm(9165): threadid=1: thread exiting with uncaught exception (group=0x40bc2300)
11-09 08:24:55.566: E/AndroidRuntime(9165): FATAL EXCEPTION: main
11-09 08:24:55.566: E/AndroidRuntime(9165): android.os.NetworkOnMainThreadException
11-09 08:24:55.566: E/AndroidRuntime(9165): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
11-09 08:24:55.566: E/AndroidRuntime(9165): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
11-09 08:24:55.566: E/AndroidRuntime(9165): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
11-09 08:24:55.566: E/AndroidRuntime(9165): at java.net.InetAddress.getAllByName(InetAddress.java:214)
11-09 08:24:55.566: E/AndroidRuntime(9165): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
11-09 08:24:55.566: E/AndroidRuntime(9165): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
11-09 08:24:55.566: E/AndroidRuntime(9165): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:341)
11-09 08:24:55.566: E/AndroidRuntime(9165): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
11-09 08:24:55.566: E/AndroidRuntime(9165): at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
11-09 08:24:55.566: E/AndroidRuntime(9165): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:315)
11-09 08:24:55.566: E/AndroidRuntime(9165): at libcore.net.http.HttpEngine.connect(HttpEngine.java:310)
11-09 08:24:55.566: E/AndroidRuntime(9165): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:289)
11-09 08:24:55.566: E/AndroidRuntime(9165): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:239)
11-09 08:24:55.566: E/AndroidRuntime(9165): at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:80)
11-09 08:24:55.566: E/AndroidRuntime(9165): at com.backcountryskiers.avalanche.report.norcal.MainActivity.getBitmapFromURL(MainActivity.java:49)
11-09 08:24:55.566: E/AndroidRuntime(9165): at com.backcountryskiers.avalanche.report.norcal.MainActivity$fetcher.onPostExecute(MainActivity.java:102)
11-09 08:24:55.566: E/AndroidRuntime(9165): at com.backcountryskiers.avalanche.report.norcal.MainActivity$fetcher.onPostExecute(MainActivity.java:1)
11-09 08:24:55.566: E/AndroidRuntime(9165): at android.os.AsyncTask.finish(AsyncTask.java:631)
11-09 08:24:55.566: E/AndroidRuntime(9165): at android.os.AsyncTask.access$600(AsyncTask.java:177)
11-09 08:24:55.566: E/AndroidRuntime(9165): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
11-09 08:24:55.566: E/AndroidRuntime(9165): at android.os.Handler.dispatchMessage(Handler.java:99)
11-09 08:24:55.566: E/AndroidRuntime(9165): at android.os.Looper.loop(Looper.java:137)
11-09 08:24:55.566: E/AndroidRuntime(9165): at android.app.ActivityThread.main(ActivityThread.java:4745)
11-09 08:24:55.566: E/AndroidRuntime(9165): at java.lang.reflect.Method.invokeNative(Native Method)
11-09 08:24:55.566: E/AndroidRuntime(9165): at java.lang.reflect.Method.invoke(Method.java:511)
11-09 08:24:55.566: E/AndroidRuntime(9165): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:789)
11-09 08:24:55.566: E/AndroidRuntime(9165): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:556)
11-09 08:24:55.566: E/AndroidRuntime(9165): at dalvik.system.NativeStart.main(Native Method)
最佳答案
您正在从getBitmapFromURL呼叫onPostExecute：
bimage = getBitmapFromURL(dangerRatingSrc);
onPreExecute和onPostExecute在UI线程上运行。您需要此代码位于doInBackground之内（因为这是在新线程上运行的部分）。更新：您可以像这样重新组织代码（如注释中所述）：
@Override
protected String doInBackground(String... params) {
try {
doc = Jsoup.connect(url).get();
Log.e("Jsoup", "...is working...");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.e("Exception", e.getMessage());
}
content = doc.select("#content");
parse = Jsoup.parse(doc.html());
results = doc.select("#content").outerHtml();
// find rating image...
dangerRatingImg = doc.select("img").first();
dangerRatingSrc = dangerRatingImg.absUrl("src");
// Get the rating image
bimage = getBitmapFromURL(dangerRatingSrc);
return results;
}
@Override
protected void onPostExecute(String result) {
// smooth out the long scrolling...
textView.setMovementMethod(ScrollingMovementMethod.getInstance());
// Set the rating image
image.setImageBitmap(bimage);
image.setPadding(10, 10, 10, 10);
image.setScaleType(ScaleType.FIT_XY);
// return the summary
results = parse.select("#reportSummary").outerHtml();
textView.setText(Html.fromHtml(results));
textView.setPadding(10, 10, 10, 10);
// ditch the dialog, it's all loaded.
dialog.dismiss();
}