之前已经提出了许多类似的问题：
仅举几例。然而，他们都没有帮助我解决自己的问题。
我正在使用 gcc版本4.8.4（Ubuntu 4.8.4-2ubuntu1~14.04.3）编译我的源代码
public class RvHomeAdapter extends RecyclerView.Adapter<RvHomeAdapter.NewsHolder> {
List<News> newsArrayList;
private static Context context;
private static long downloadReference;
VideoRequestHandler videoRequestHandler;
Picasso picassoInstance;
public RvHomeAdapter(List<News> newsArrayList, Context context) {
this.newsArrayList = newsArrayList;
RvHomeAdapter.context = context;
/* videoRequestHandler = new VideoRequestHandler();
picassoInstance = new Picasso.Builder(context.getApplicationContext())
.addRequestHandler(videoRequestHandler)
.build();*/
}
@Override
public NewsHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.news_row, viewGroup, false);
NewsHolder newsHolder = new NewsHolder(v);
return newsHolder;
}
@Override
public void onBindViewHolder(final NewsHolder holder, final int position) {
if (newsArrayList.get(position).getType().equals("image")) {
holder.btn_play.setBackgroundResource(R.drawable.image);
try {
Picasso.with(context)
.load(newsArrayList.get(position).getThumb_image())
.fit()
.into(holder.img_main);
} catch (Exception e) {
e.printStackTrace();
}
} else if (newsArrayList.get(position).getType().equals("video")) {
try {
/*try {
Picasso.with(context)
.load(newsArrayList.get(position).getThumb_image())
.fit()
.into(holder.img_main);
} catch (Exception e) {
e.printStackTrace();
}*/
FFmpegMediaMetadataRetriever mmr = new FFmpegMediaMetadataRetriever();
mmr.setDataSource(newsArrayList.get(position).getLink());
mmr.extractMetadata(FFmpegMediaMetadataRetriever.METADATA_KEY_ALBUM);
mmr.extractMetadata(FFmpegMediaMetadataRetriever.METADATA_KEY_ARTIST);
Bitmap b = mmr.getFrameAtTime(2000000, FFmpegMediaMetadataRetriever.OPTION_CLOSEST); // frame at 2 seconds
// byte [] artwork = mmr.getEmbeddedPicture();
mmr.release();
holder.img_main.setImageBitmap(b);
} catch (Throwable throwable) {
throwable.printStackTrace();
}
holder.btn_play.setBackgroundResource(R.drawable.video);
// holder.img_main.setImageBitmap(null);
}
// Typeface font = Typeface.createFromAsset(context.getAssets(), "saumil_guj.ttf");
// holder.tv_news.setTypeface(font);
holder.tv_news.setText(newsArrayList.get(position).getTitle());
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
public static Bitmap retriveVideoFrameFromVideo(String videoPath)
throws Throwable {
Bitmap bitmap = null;
MediaMetadataRetriever mediaMetadataRetriever = null;
try {
mediaMetadataRetriever = new MediaMetadataRetriever();
if (Build.VERSION.SDK_INT >= 14)
mediaMetadataRetriever.setDataSource(videoPath, new HashMap<String, String>());
else
mediaMetadataRetriever.setDataSource(videoPath);
// mediaMetadataRetriever.setDataSource(videoPath);
bitmap = mediaMetadataRetriever.getFrameAtTime();
} catch (Exception e) {
e.printStackTrace();
throw new Throwable(
"Exception in retriveVideoFrameFromVideo(String videoPath)"
+ e.getMessage());
} finally {
if (mediaMetadataRetriever != null) {
mediaMetadataRetriever.release();
}
}
Log.e("", "retriveVideoFrameFromVideo: bitmap = " + bitmap);
return bitmap;
}
@Override
public int getItemCount() {
return newsArrayList.size();
}
public class NewsHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
ImageView img_download, img_share, img_main;
TextView tv_news;
Button btn_play;
private DownloadManager downloadManager;
public NewsHolder(View itemView) {
super(itemView);
btn_play = (Button) itemView.findViewById(R.id.btn_play);
img_download = (ImageView) itemView.findViewById(R.id.img_download);
img_share = (ImageView) itemView.findViewById(R.id.img_share);
tv_news = (TextView) itemView.findViewById(R.id.tv_news);
img_main = (ImageView) itemView.findViewById(R.id.img_main);
img_main.setImageDrawable(null);
btn_play.setOnClickListener(this);
img_download.setOnClickListener(this);
img_share.setOnClickListener(this);
img_main.setOnClickListener(this);
}
@Override
public void onClick(View v) {
if (v.getId() == img_download.getId()) {
String link = newsArrayList.get(getAdapterPosition()).getLink();
String FileType = link.substring(link.lastIndexOf(".") + 1);
System.out.println(link.substring(link.lastIndexOf(".") + 1));
if (newsArrayList.get(getAdapterPosition()).getType().equals("image")) {
File extStore = Environment.getExternalStorageDirectory();
File myFile = new File(extStore.getAbsolutePath() + "/Botad News/Images/" + newsArrayList.get(getAdapterPosition()).getTitle() + "." + FileType);
if (!myFile.exists()) {
if (ConnectivityReceiver.isConnected()) {
DownloadTask downloadTask = new DownloadTask(context);
downloadTask.execute(newsArrayList.get(getAdapterPosition()).getLink(), "" + newsArrayList.get(getAdapterPosition()).getTitle() + "." + FileType, newsArrayList.get(getAdapterPosition()).getType());
} else {
Toast.makeText(context, context.getString(R.string.please_connect_to_internet), Toast.LENGTH_SHORT).show();
}
} else {
new AlertDialog.Builder(context)
.setTitle(R.string.app_name)
.setMessage(R.string.file_already_exists)
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// continue with delete
}
})
.setIcon(R.mipmap.ic_launcher)
.show();
// Toast.makeText(context, "File already exists", Toast.LENGTH_SHORT).show();
}
} else {
File extStore = Environment.getExternalStorageDirectory();
File myFile = new File(extStore.getAbsolutePath() + "/Botad News/Videos/" + newsArrayList.get(getAdapterPosition()).getTitle() + "." + FileType);
if (!myFile.exists()) {
if (ConnectivityReceiver.isConnected()) {
DownloadTask downloadTask = new DownloadTask(context);
downloadTask.execute(newsArrayList.get(getAdapterPosition()).getLink(), "" + newsArrayList.get(getAdapterPosition()).getTitle() + "." + FileType, newsArrayList.get(getAdapterPosition()).getType());
} else {
Toast.makeText(context, context.getString(R.string.please_connect_to_internet), Toast.LENGTH_SHORT).show();
}
} else {
new AlertDialog.Builder(context)
.setTitle(R.string.app_name)
.setMessage("File already exists !")
.setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// continue with delete
}
})
.setIcon(R.mipmap.ic_launcher)
.show();
// Toast.makeText(context, "File already exists", Toast.LENGTH_SHORT).show();
}
}
} else if (v.getId() == img_share.getId()) {
if (newsArrayList.get(getAdapterPosition()).getType().equals("video")) {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_SEND);
// intent.setType("text/plain");
intent.setType("video/*");
intent.putExtra(Intent.EXTRA_TEXT, newsArrayList.get(getAdapterPosition()).getLink());
context.startActivity(Intent.createChooser(intent, "Share"));
} else {
Intent intent = new Intent();
intent.setAction(Intent.ACTION_SEND);
// intent.setType("text/plain");
intent.setType("image/*");
intent.putExtra(Intent.EXTRA_TEXT, newsArrayList.get(getAdapterPosition()).getLink());
context.startActivity(Intent.createChooser(intent, "Share"));
}
} else if (v.getId() == btn_play.getId()) {
if (newsArrayList.get(getAdapterPosition()).getType().contains("image")) {
// Toast.makeText(v.getContext(), "button image", Toast.LENGTH_SHORT).show();
Bundle gameData = new Bundle();
gameData.putString("file", newsArrayList.get(getAdapterPosition()).getLink());
Intent intent = new Intent(context, ImageViewActivity.class);
intent.putExtras(gameData);
context.startActivity(intent);
} else {
if (ConnectivityReceiver.isConnected()) {
Bundle gameData = new Bundle();
gameData.putString("file", newsArrayList.get(getAdapterPosition()).getLink());
// Toast.makeText(v.getContext(), "button video", Toast.LENGTH_SHORT).show();
Intent intent = new Intent(context, VideoViewActivity.class);
intent.putExtras(gameData);
context.startActivity(intent);
} else {
Toast.makeText(context, context.getString(R.string.please_connect_to_internet), Toast.LENGTH_SHORT).show();
}
}
} else {
// Toast.makeText(v.getContext(), "ROW PRESSED = " + String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
}
}
}
}
然后我在我的一个源文件上运行 gcov（Ubuntu 4.8.4-2ubuntu1~14.04.3）4.8.4
g++ -c -pipe -Wno-psabi -std=gnu++11 -Wextra -pedantic -fprofile-arcs -ftest-coverage --coverage -fno-inline -fno-inline-small-functions -fno-default-inline -O0 -fno-elide-constructors -g -Wall -W -o .obj/myclass.o unittest_myclass.cpp
此文件包含仅限标题类的单元测试。 gcov成功生成此头文件的覆盖率信息：
gcov unittest_myclass.cpp -o .obj/
但是， myclass.h.gcov 中的结果是错误的。对于大多数行，gcov报告他们不包含可执行代码。对于那些检测为可执行文件的人，它主要报告他们尚未执行。但我确信它们正在被执行（我在调试期间验证了它，某些单元测试由于错误而失败等）。没有涉及模板。 因此我想由于某种原因gcov无法检测到正确的执行。从上面的命令行参数中可以看出：优化已关闭，内联已关闭......
还有什么想法会导致这些问题吗？
答案 0 :(得分：1)
因为看起来问题不在于我的班级只是标题，而是我用
打电话给gcov gcov unittest_myclass.cpp -o .obj/
如果我用
运行它 gcov *.cpp -o .obj/
报告
File '../include/myclass.h'
Lines executed:95.56% of 248
Creating 'myclass.h.gcov'
并且生成的myclass.h.gcov文件看起来比我预期的要多得多。