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onCreate沒有被調用，用斷點調試代碼。onCreate沒有被調用，當我檢查斷點時
public class authentication extends AppCompatActivity
{
Context context=this;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.v("sdfsdf","sdffdf");
setContentView(R.layout.web_view);
WebView webView=(WebView)findViewById(R.id.webView_id);
webView.loadUrl("https://www.google.com");
}
}
當我用的斷點我發現request_tmdb構造函數被調用，但 onCreate（）方法是不叫：
public class request_tmdb extends AppCompatActivity {
public request_tmdb() {
new request_token().execute();
}
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
startActivity(new Intent(this,authentication.class));
}
public static class request_token extends AsyncTask<Void, Void, String[]> {
static String requesttoken_string;
HttpURLConnection urlConnection = null;
BufferedReader reader = null;
// Will contain the raw JSON response as a string.
String forecastJsonStr = null;
@Override
protected String[] doInBackground(Void... params) {
try {
final String FORECAST_BASE_URL =
"http://api.themoviedb.org/3/";
final String movie_info_url = FORECAST_BASE_URL + "authentication/token/new";
final String QUERY_PARAM = "api_key";
Uri builtUri = Uri.parse(movie_info_url).buildUpon()
.appendQueryParameter(QUERY_PARAM, BuildConfig.MOVIES_DB_API_KEY)
.build();
URL url = new URL(builtUri.toString());
// Create the request to OpenWeatherMap, and open the connection
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.connect();
// Read the input stream into a String
InputStream inputStream = urlConnection.getInputStream();
StringBuffer buffer = new StringBuffer();
if (inputStream == null) {
// Nothing to do.
return null;
}
reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
buffer.append(line + "\n");
}
if (buffer.length() == 0) {
// Stream was empty. No point in parsing.
return null;
}
forecastJsonStr = buffer.toString();
} catch (IOException e) {
Log.e("Fetch Movie Data", "Error ", e);
return null;
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
if (reader != null) {
try {
reader.close();
} catch (final IOException e) {
Log.e("Fetch Movie Data", "Error closing stream", e);
}
}
}
Log.v("JSON", forecastJsonStr);
getJsonRequestToken_data(forecastJsonStr);
return null;
}
public void getJsonRequestToken_data(String data) {
try {
JSONObject json_requesttoken_object = new JSONObject(data);
requesttoken_string = json_requesttoken_object.getString("request_token").toString();
Log.v("Token", requesttoken_string);
} catch (JSONException e) {
e.printStackTrace();
}
}
}
認證類。
Android清單
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.venkateswara.movies1">
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="@string/app_name"
android:theme="@style/AppTheme.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".request_tmdb"
android:parentActivityName=".MainActivity"/>
<activity android:name=".authentication"
android:parentActivityName=".MainActivity"/>
</application>
<uses-permission android:name="android.permission.INTERNET" />
</manifest>
我從DisplayMovie_Data類調用request_tmdb。
public class new_Movie_imgtxt extends AppCompatActivity {
static JSONArray resultsArray;
static JSONObject jsonString;
static String movie_sort="popular";
//Display poster, Title ,popularity and vote average
public static class fetchMovieData extends AsyncTask<Void, Void, String[]> {
static public String[] title;
static public String[] image_url;
static public double[] popularity;
static public String[] vote_avg;
@Override
protected String[] doInBackground(Void... params) {
movie_sort=movie_tab;
// These two need to be declared outside the try/catch
// so that they can be closed in the finally block.
HttpURLConnection urlConnection = null;
BufferedReader reader = null;
// Will contain the raw JSON response as a string.
String forecastJsonStr = null;
try {
final String FORECAST_BASE_URL =
"http://api.themoviedb.org/3/";
final String movie_info_url=FORECAST_BASE_URL+"movie/"+movie_sort+"?";
final String QUERY_PARAM = "api_key";
Uri builtUri = Uri.parse(movie_info_url).buildUpon()
.appendQueryParameter(QUERY_PARAM, BuildConfig.MOVIES_DB_API_KEY)
.build();
URL url = new URL(builtUri.toString());
// Create the request to OpenWeatherMap, and open the connection
urlConnection = (HttpURLConnection) url.openConnection();
urlConnection.setRequestMethod("GET");
urlConnection.connect();
// Read the input stream into a String
InputStream inputStream = urlConnection.getInputStream();
StringBuffer buffer = new StringBuffer();
if (inputStream == null) {
// Nothing to do.
return null;
}
reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
// Since it's JSON, adding a newline isn't necessary (it won't affect parsing)
// But it does make debugging a *lot* easier if you print out the completed
// buffer for debugging.
buffer.append(line + "\n");
}
if (buffer.length() == 0) {
// Stream was empty. No point in parsing.
return null;
}
forecastJsonStr = buffer.toString();
} catch (IOException e) {
Log.e("Fetch Movie Data", "Error ", e);
// If the code didn't successfully get the weather title, there's no point in attemping
// to parse it.
return null;
} finally {
if (urlConnection != null) {
urlConnection.disconnect();
}
if (reader != null) {
try {
reader.close();
} catch (final IOException e) {
Log.e("Fetch Movie Data", "Error closing stream", e);
}
}
}
getJsonData(forecastJsonStr);
new DisplayMovie_Data(title,image_url,popularity,vote_avg);
return null;
}
@Override
protected void onPostExecute(String[] strings) {
super.onPostExecute(strings);
new DisplayMovie_Data(title,image_url,popularity,vote_avg);
}
// Json title is fetched
public void getJsonData(String forecastJsonString) {
try {
jsonString = new JSONObject(forecastJsonString);
resultsArray = jsonString.getJSONArray("results");
title = new String[resultsArray.length()];
popularity=new double[resultsArray.length()];
vote_avg=new String[resultsArray.length()];
image_url=new String[resultsArray.length()];
for (int i = 0; i < resultsArray.length(); i++)
{
image_url[i]=resultsArray.getJSONObject(i).getString("poster_path").toString();
title[i] = resultsArray.getJSONObject(i).getString("original_title").toString();
popularity[i]=resultsArray.getJSONObject(i).getDouble("popularity");
vote_avg[i]=resultsArray.getJSONObject(i).getString("vote_average").toString();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
static String[] result=new String[20];
static Context mcontext;
static String[] image_url1=new String[20];
static double[] popular=new double[20];
static String[] vote=new String[20];
static String movie_tab;
static DecimalFormat df=new DecimalFormat("#.##");
public static class DisplayMovie_Data extends BaseAdapter{
public DisplayMovie_Data(Context mActivity,String filter) {
mcontext = mActivity;
movie_tab=filter;
new new_Movie_imgtxt.fetchMovieData().execute();
new request_tmdb();
}
public DisplayMovie_Data(String[] data,String[] image_url,double[] popularity1,String[] vote_avg1)
{
result=data;
image_url1=image_url;
popular=popularity1;
vote=vote_avg1;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return result.length;
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return result[position];
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public class Holder {
TextView tv;
TextView tv1;
TextView tv2;
ImageView img;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
Holder holder;
View view;
view=convertView;
if(view==null)
{
LayoutInflater inflater = (LayoutInflater) mcontext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.content_list_text_adapter, null);
holder = new Holder();
holder.tv = (TextView) view.findViewById(R.id.main_title_textview);
holder.tv1=(TextView) view.findViewById(R.id.main_popularity_textview);
holder.tv2=(TextView) view.findViewById(R.id.main_voteavg_textview);
holder.img = (ImageView) view.findViewById(R.id.main_content_image);
view.setTag(holder);
}
else
holder=(Holder)view.getTag();
holder.tv.setText(result[position]);
holder.tv1.setText(df.format(popular[position])+""); //format popularity to two decimal places
holder.tv2.setText(vote[position]);
Picasso.with(mcontext).load("http://image.tmdb.org/t/p/w185/"+image_url1[position]).into(holder.img);
return view;
}
}
}
你是如何開始'request_tmdb'？ –
如果我在任何其他方法內調用startActivity（），我收到空指針異常。由於onCreate（）現在沒有被調用，所以我希望現在我沒有得到這個錯誤。有人能幫我解決這個問題 –
@MikeM有什麼問題。我從另一個班級打電話給我。 –