问题
I want an app 'back' button press to show interstitial ad. Currently it only works to show ads by pressing phone's back button.
Code here:
public class WordpressDetailActivity extends ActionBarActivity {
private InterstitialAd interstitial;
private boolean adShown;
private FeedItem feed;
private Toolbar mToolbar;
private FavDbAdapter mDbHelper;
ImageLoader imageLoader;
WebView htmlTextView;
private ImageView thumb;
private TextView mTitle;
private int mImageHeight;
boolean FadeBar = true;
int latestAlpha;
String id;
String link;
String title;
String content;
@SuppressLint("SetJavaScriptEnabled")
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_wordpress_details);
initializeAds();
mToolbar = (Toolbar) findViewById(R.id.toolbar_actionbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
imageLoader = Helper.initializeImageLoader(this);
thumb = (ImageView) findViewById(R.id.image);
String url = getIntent().getStringExtra("apiurl") +"get_post/?post_id=";
Bundle bundle = this.getIntent().getExtras();
//get data from favorites or online
if ("true".equals(bundle.getString("fav"))){
content = bundle.getString("favId");
title = bundle.getString("favTitle");
link = bundle.getString("favUrl");
} else {
feed = (FeedItem) this.getIntent().getSerializableExtra("feed");
if (feed != null) {
id = feed.getId();
title = feed.getTitle();
link = feed.getUrl();
//getting a valid url, displaying it and setting a parralax listener. Also a fallback for no image.
String imageurl = feed.getAttachmentUrl();
if (null == imageurl || imageurl.equals("")){
imageurl = feed.getThumbnailUrl();
}
if (null == imageurl || imageurl.equals("")){
thumb.getLayoutParams().height = (getActionBarHeight());
FadeBar = false;
} else {
imageLoader.displayImage(imageurl, thumb);
mImageHeight = thumb.getLayoutParams().height;
((TrackingScrollView) findViewById(R.id.scroller)).setOnScrollChangedListener(
new TrackingScrollView.OnScrollChangedListener() {
@Override
public void onScrollChanged(TrackingScrollView source, int l, int t, int oldl, int oldt) {
handleScroll(source, t);
}
}
);
}
}
}
if ((getResources().getString(R.string.ad_visibility).equals("0"))){
// Look up the AdView as a resource and load a request.
AdView adView = (AdView) findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
adView.loadAd(adRequest);
}
//if content at all
if (null != feed || null != bundle) {
mTitle = (TextView) findViewById(R.id.title);
mTitle.setText(title);
htmlTextView = (WebView) findViewById(R.id.context);
htmlTextView.getSettings().setJavaScriptEnabled(true);
htmlTextView.setBackgroundColor(Color.argb(1, 0, 0, 0));
htmlTextView.getSettings().setDefaultFontSize(WebHelper.getWebViewFontSize(this));
htmlTextView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
htmlTextView.setWebViewClient(new WebViewClient(){
public boolean shouldOverrideUrlLoading(WebView view, String url) {
if (url != null && (url.startsWith("http://") || url.startsWith("http://"))) {
Intent mIntent = new Intent(WordpressDetailActivity.this, WebviewActivity.class);
mIntent.putExtra(WebviewActivity.URL, url);
startActivity(mIntent);
return true;
} else {
Uri uri = Uri.parse(url);
Intent ViewIntent = new Intent(Intent.ACTION_VIEW, uri);
// Verify it resolves
PackageManager packageManager = getPackageManager();
List<ResolveInfo> activities = packageManager.queryIntentActivities(ViewIntent, 0);
boolean isIntentSafe = activities.size() > 0;
// Start an activity if it's safe
if (isIntentSafe) {
startActivity(ViewIntent);
}
return true;
}
}
});
}
//fresh from the web or old from favorites?
if (id != null){
new DownloadFilesTask().execute(url, id);
} else if (content != null) {
Log.v("INFO", "content: " + content);
thumb.getLayoutParams().height = (getActionBarHeight());
FadeBar = false;
setHTML(content);
}
if (FadeBar){
mToolbar.getBackground().setAlpha(0);
Helper.setStatusBarColor(WordpressDetailActivity.this, getResources().getColor(R.color.black));
getSupportActionBar().setDisplayShowTitleEnabled(false);
}
Button btnFav = (Button) findViewById(R.id.favoritebutton);
//Listening to button event
btnFav.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
mDbHelper = new FavDbAdapter(WordpressDetailActivity.this);
mDbHelper.open();
if(mDbHelper.checkEvent(title, content, "", link, "", "", "wordpress")) {
// Item is new
mDbHelper.addFavorite(title, content, "", link, "", "", "wordpress");
Toast toast = Toast.makeText(WordpressDetailActivity.this, getResources().getString(R.string.favorite_success), Toast.LENGTH_LONG);
toast.show();
} else {
Toast toast = Toast.makeText(WordpressDetailActivity.this, getResources().getString(R.string.favorite_duplicate), Toast.LENGTH_LONG);
toast.show();
}
}
});
}
private void initializeAds() {
interstitial = new InterstitialAd(this);
interstitial.setAdUnitId(getString(R.string.admob_interstitial));
AdRequest adRequest = new AdRequest.Builder()
.build();
interstitial.loadAd(adRequest);
interstitial.setAdListener(new AdListener() {
@Override
public void onAdClosed() {
super.onAdClosed();
}
});
}
@Override
public void onBackPressed() {
if (interstitial != null && interstitial.isLoaded() && !adShown) {
interstitial.show();
adShown = true;
} else {
this.finish();
}
}
private void handleScroll(TrackingScrollView source, int top) {
int scrolledImageHeight = Math.min(mImageHeight, Math.max(0, top));
ViewGroup.MarginLayoutParams imageParams = (ViewGroup.MarginLayoutParams) thumb.getLayoutParams();
int newImageHeight = mImageHeight - scrolledImageHeight;
if (imageParams.height != newImageHeight) {
// Transfer image height to margin top
imageParams.height = newImageHeight;
imageParams.topMargin = scrolledImageHeight;
// Invalidate view
thumb.setLayoutParams(imageParams);
}
if (FadeBar){
final int imageheaderHeight = thumb.getHeight() - getSupportActionBar().getHeight();
//t=how far you scrolled
//ratio is from 0,0.1,0.2,...1
final float ratio = (float) Math.min(Math.max(top, 0), imageheaderHeight) / imageheaderHeight;
//setting the new alpha value from 0-255 or transparent to opaque
final int newAlpha = (int) (ratio * 255);
if (newAlpha != latestAlpha){
mToolbar.getBackground().setAlpha(newAlpha);
Helper.setStatusBarColor(WordpressDetailActivity.this, blendColors(ratio, this));
}
latestAlpha = newAlpha;
}
}
@Override
public void onPause(){
super.onPause();
mToolbar.getBackground().setAlpha(255);
}
@Override
public void onResume(){
super.onPause();
if (FadeBar)
mToolbar.getBackground().setAlpha(latestAlpha);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.wordpress_detail_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
finish();
return true;
case R.id.menu_share:
shareContent();
return true;
case R.id.menu_view:
Intent intent = new Intent(Intent.ACTION_VIEW,
Uri.parse(link));
startActivity(intent);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
private void shareContent() {
Intent sendIntent = new Intent();
sendIntent.setAction(Intent.ACTION_SEND);
sendIntent.putExtra(Intent.EXTRA_TEXT, title + "\n" + link);
sendIntent.setType("text/plain");
startActivity(Intent.createChooser(sendIntent, "Share using"));
}
private class DownloadFilesTask extends AsyncTask<String, Integer, FeedItem> {
@Override
protected void onProgressUpdate(Integer... values) {
}
@Override
protected void onPostExecute(FeedItem result) {
if (null != result){
content = result.getContent();
setHTML(result.getContent());
} else {
findViewById(R.id.progressBar).setVisibility(View.GONE);
Helper.noConnection(WordpressDetailActivity.this, true);
}
}
@Override
protected FeedItem doInBackground(String... params) {
String url = params[0];
String postid = params[1];
// getting JSON string from URL
JSONObject json = getJSONFromUrl(url + postid);
Log.v("INFO", url + postid);
//parsing json data
FeedItem item = parseJson(json);
return item;
}
}
public void setHTML(String source){
Document doc = Jsoup.parse(source);
try {
doc.select("img").first().remove(); //first image is most times repeat of header
} catch (Exception e){
e.printStackTrace();
}
String html = WebHelper.docToBetterHTML(doc, this);
Log.v("INFO", "HTMLisnull" + html.equals(null) + "Linkisnull" + link.equals(null));
htmlTextView.loadDataWithBaseURL(link, html , "text/html", "UTF-8", "");
htmlTextView.setVisibility(View.VISIBLE);
findViewById(R.id.progressBar).setVisibility(View.GONE);
Log.v("INFO", "Wordpress HTML: " + html);
}
public JSONObject getJSONFromUrl(String url) {
InputStream is = null;
JSONObject jObj = null;
String json = null;
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.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");
}
is.close();
json = sb.toString();
jObj = new JSONObject(json);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
runOnUiThread(new Runnable() {
@Override
public void run() {
findViewById(R.id.progressBar).setVisibility(View.GONE);
}
});
} catch (Exception e) {
Log.e("JSON Parser", "Exception: " + e.toString());
runOnUiThread(new Runnable() {
@Override
public void run() {
findViewById(R.id.progressBar).setVisibility(View.GONE);
}
});
}
// return JSON String
return jObj;
}
public FeedItem parseJson(JSONObject json) {
try {
// parsing json object
if (json.getString("status").equalsIgnoreCase("ok")) {
JSONObject post = json.getJSONObject("post");
FeedItem item = new FeedItem();
item.setTitle(Html.fromHtml(post.getString("title")).toString());
item.setDate(post.getString("date"));
item.setId(post.getString("id"));
item.setUrl(post.getString("url"));
item.setContent(post.getString("content"));
JSONArray attachments = post.getJSONArray("attachments");
if (null != attachments && attachments.length() > 0) {
JSONObject attachment = attachments.getJSONObject(0);
if (attachment != null)
item.setAttachmentUrl(attachment.getString("url"));
}
return item;
}
} catch (JSONException e) {
e.printStackTrace();
} catch (Exception e){
e.printStackTrace();
}
return null;
}
private int getActionBarHeight() {
int actionBarHeight = getSupportActionBar().getHeight();
if (actionBarHeight != 0)
return actionBarHeight;
final TypedValue tv = new TypedValue();
if (getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true))
actionBarHeight = TypedValue.complexToDimensionPixelSize(tv.data, getResources().getDisplayMetrics());
return actionBarHeight;
}
private static int blendColors(float ratio, Context c) {
int color1 = c.getResources().getColor(R.color.myPrimaryDarkColor);
int color2 = c.getResources().getColor(R.color.black);
final float inverseRation = 1f - ratio;
float r = (Color.red(color1) * ratio) + (Color.red(color2) * inverseRation);
float g = (Color.green(color1) * ratio) + (Color.green(color2) * inverseRation);
float b = (Color.blue(color1) * ratio) + (Color.blue(color2) * inverseRation);
return Color.rgb((int) r, (int) g, (int) b);
}
}
来源：https://stackoverflow.com/questions/34553649/admob-interstitial-ad-not-working-in-this-situation