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谷歌游戏控制台报告应用程序崩溃,我无法复制

google-play-console gridview testing firebase android
  •  0
  • Maksim Golendukhin  · 技术社区  · 6 年前

    android vitals报表中的google play控制台提供了以下信息 

    java.lang.RuntimeException: 
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2955)
  at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:3030)
  at android.app.ActivityThread.-wrap11 (Unknown Source)
  at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1696)
  at android.os.Handler.dispatchMessage (Handler.java:105)
  at android.os.Looper.loop (Looper.java:164)
  at android.app.ActivityThread.main (ActivityThread.java:6938)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.android.internal.os.Zygote$MethodAndArgsCaller.run (Zygote.java:327)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1374)
Caused by: java.lang.NullPointerException: 
  at com.golendukhin.whitenoise.GridAdapter.getCount (GridAdapter.java:52)
  at android.widget.GridView.setAdapter (GridView.java:243)
  at com.golendukhin.whitenoise.FoldersGridActivity.onCreate (FoldersGridActivity.java:60)
  at android.app.Activity.performCreate (Activity.java:7183)
  at android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:1220)
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2908)

    据我所知,发生这种情况是因为网格适配器的getCount方法返回空值。Hense,网格适配器不工作。母鸡,整片土地都不是创造出来的。只有三星的设备才有这样的问题。

    首先,我尝试用相同的android版本、ram和arm创建相同的模拟设备。模拟器工作得非常好。没有错误。

    然后我添加了一些测试,以确保getcount工作正常并且创建了活动。 

    @RunWith(AndroidJUnit4.class)
public class GridViewTest {

    @Rule
    public ActivityTestRule<FoldersGridActivity> foldersGridActivityTestRule  = new  ActivityTestRule<>(FoldersGridActivity.class);

    @Test
    public void ensureGridAdapterIsNotNull() {
        FoldersGridActivity foldersGridActivity = foldersGridActivityTestRule.getActivity();
        View view = foldersGridActivity.findViewById(R.id.grid_view);
        GridView gridView = (GridView) view;
        GridAdapter gridAdapter = (GridAdapter) gridView.getAdapter();
        assertThat(gridAdapter, notNullValue());
    }

    @Test
    public void ensureArrayAdapterInGridActivityIsNotEmpty() {
        FoldersGridActivity foldersGridActivity = foldersGridActivityTestRule.getActivity();
        View view = foldersGridActivity.findViewById(R.id.grid_view);
        GridView gridView = (GridView) view;
        GridAdapter gridAdapter = (GridAdapter) gridView.getAdapter();
        assertTrue(gridAdapter.getCount() > 0 );
    }

    @Test
    public void gridViewIsVisibleAndClickable() {
        onData(anything()).inAdapterView(withId(R.id.grid_view)).atPosition(0).perform(click());
        onView(withId(R.id.toolbar_title_text_view)).check(matches(withText("rain")));
    }
}

    所有模拟设备都成功通过了测试。 然后,我添加了firebase testlab,并使用android 8在galaxy s9 real设备上启动了测试。所有测试都通过了。

    适配器代码。是的,我已经重写了getCount()方法,尽管它没有任何意义。 

    public class GridAdapter extends ArrayAdapter<TracksFolder> {
    @BindView(R.id.folder_text_view) TextView textView;
    @BindView(R.id.grid_item_image_view) ImageView imageView;

    private ArrayList<TracksFolder> tracksFolders;
    private Context context;

    GridAdapter(Context context, int resource, ArrayList<TracksFolder> tracksFolders) {
        super(context, resource, tracksFolders);
        this.tracksFolders = tracksFolders;
        this.context = context;
    }

    /**
     * @return grid item, customized via TracksFolder class instance
     */
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = LayoutInflater.from(context).inflate(R.layout.grid_item, parent, false);
        }
        ButterKnife.bind(this, convertView);

        String folderName = tracksFolders.get(position).getFolderName();
        int imageResource = tracksFolders.get(position).getImageResource();
        textView.setText(folderName);
        imageView.setImageResource(imageResource);

        return convertView;
    }

    /**
     * Added to possibly avoid NPE on multiple devices
     * Could not reproduce this error
     * @return size of tracksFolders
     */
    @Override
    public int getCount() {
        return tracksFolders.size();
    }
}

    所以,我有几个问题: 首先,这个崩溃报告是否意味着每次Sumsung的所有者发布应用程序时都会发生这种崩溃?由于一些三星设备坚持统计,我想没有。 其次,我该怎么做才能以某种方式重现这个错误并最终修复这个错误。

    我知道这个问题太宽泛了,但我会非常感谢你的帮助,因为我完全不知道下一步该怎么做。

    入门级。使用适配器 

    import android.content.Intent;
import android.content.SharedPreferences;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.GridView;

import com.google.firebase.crash.FirebaseCrash;

import java.util.ArrayList;
import butterknife.BindArray;
import butterknife.BindView;
import butterknife.ButterKnife;

import static com.golendukhin.whitenoise.SharedPreferencesUtils.writeToSharedPreferences;

public class FoldersGridActivity extends AppCompatActivity {
    @BindView(R.id.grid_view) GridView gridView;
    @BindArray(R.array.labels) String[] foldersName;
    @BindView(R.id.toolbar_like_button) Button toolbarLikeButton;
    @BindView(R.id.toolbar_back_button) Button toolbarBackButton;

    private ArrayList<TracksFolder> tracksFolders;

    /**
     * Binds all UI views
     * Defines variables to feed adapter and listeners
     * Initializes grid adapter, sets number of columns via phone in portrait or landscape orientation
     * Sets onclick listener for every grid item
     * Sets onclick for toolbar "like" button
     */
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.folders_grid_view);
        ButterKnife.bind(this);

        if (getIntent().getExtras() != null) { //activity is triggered via on back pressed
            Bundle bundle = getIntent().getExtras();
            tracksFolders = (ArrayList<TracksFolder>) bundle.getSerializable("tracksFolders");
        } else if (savedInstanceState != null) { //this happens after screen is rotated
            tracksFolders = (ArrayList<TracksFolder>) savedInstanceState.getSerializable("tracksFolders");
        } else { //this happens if app is launched by user
            tracksFolders = getTracksFolders();
            initService();
        }

        toolbarBackButton.setVisibility(View.GONE);

        GridAdapter gridAdapter;
        gridAdapter = new GridAdapter(this, R.id.grid_view, tracksFolders);
        gridView.setNumColumns(getResources().getInteger(R.integer.columns_number));
        gridView.setAdapter(gridAdapter);
        FirebaseCrash.log("Activity created");

        gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Bundle bundle = new Bundle();
                bundle.putSerializable("tracksFolders", tracksFolders);
                bundle.putInt("folderPosition", position);
                Intent intent = new Intent(FoldersGridActivity.this, TracksListActivity.class);
                intent.putExtras(bundle);
                startActivity(intent);
            }
        });

        toolbarLikeButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Bundle bundle = new Bundle();
                bundle.putSerializable("tracksFolders", tracksFolders);
                bundle.putInt("activityFrom", Constants.FROM_FOLDERS_GRID_ACTIVITY);
                Intent intent = new Intent(FoldersGridActivity.this, LikedTracksListActivity.class);
                intent.putExtras(bundle);
                startActivity(intent);
            }
        });
    }

    /**
     * Saves tracksFolders array list to rebuild activity after rotation
     */
    @Override
    protected void onSaveInstanceState(Bundle outState) {
        outState.putSerializable("tracksFolders", tracksFolders);
        writeToSharedPreferences(this, tracksFolders);
        super.onSaveInstanceState(outState);
    }

    @Override
    public void onBackPressed() {
        super.onBackPressed();
        moveTaskToBack(true);
    }

    /**
     * After app is launched need to initialize audio player service
     */
    private void initService() {
        Intent intent = new Intent(FoldersGridActivity.this, AudioPlayerService.class);
        startService(intent);
    }

    /**
     * If tracksFolders is not stored in shared preferences, it is initialized from resources.
     * @return arrayList of folders with arrayList of tracks belonging to every folder
     */
    private ArrayList<TracksFolder> getTracksFolders() {
        Resources resources = getResources();
        TypedArray pictures = resources.obtainTypedArray(R.array.pictures);

        ArrayList<TracksFolder> tracksFolders = new ArrayList<>();
        for (int i = 0; i < foldersName.length; i++) {
            String folderName = foldersName[i];
            int imageResource = pictures.getResourceId(i, -1);
            ArrayList<Track> tracks = getArrayListOfTracks(resources, i, imageResource);
            tracksFolders.add(new TracksFolder(folderName, imageResource, tracks));
        }
        pictures.recycle();
        return tracksFolders;
    }

    /**
     * @param resources      need to get typedArray to get array of audio files names
     * @param folderPosition passed to Track constructor
     * @param imageResource  passed to Track constructor
     *                       Liked tracks are obtained from shared preferences
     * @return array list of tracks for every folder
     */
    private ArrayList<Track> getArrayListOfTracks(Resources resources, int folderPosition, int imageResource) {
        TypedArray audioTracksTypedArray = resources.obtainTypedArray(R.array.audio_tracks);
        int audioTracksId = audioTracksTypedArray.getResourceId(folderPosition, 0);
        String[] audio = resources.getStringArray(audioTracksId);
        audioTracksTypedArray.recycle();

        TypedArray trackNamesTypedArray = resources.obtainTypedArray(R.array.track_names);
        int trackNamesId = trackNamesTypedArray.getResourceId(folderPosition, 0);
        String[] trackNames = resources.getStringArray(trackNamesId);
        trackNamesTypedArray.recycle();

        SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());

        ArrayList<Track> tracksInFolder = new ArrayList<>();
         for (int i = 0; i < trackNames.length; i++) {
            int audioResource = resources.getIdentifier(audio[i], "raw", this.getPackageName());
            String trackName = trackNames[i].replace("_", " ");
            boolean isLiked = sharedPreferences.getBoolean(String.valueOf(audioResource), false);
            tracksInFolder.add(new Track(audioResource, trackName, imageResource, isLiked));
        }
        return tracksInFolder;
    }
    //todo убрать полосы в списках треков
}

    更新的类: 

    @NonNull
    private  ArrayList<TracksFolder> getTracksFoldersAndInitService(Bundle savedInstanceState) {
        if (getIntent().getExtras() != null) { //activity is triggered via on back pressed
            Bundle bundle = getIntent().getExtras();
            tracksFolders = (ArrayList<TracksFolder>) bundle.getSerializable("tracksFolders");
        } else if (savedInstanceState != null) { //this happens after screen is rotated
            tracksFolders = (ArrayList<TracksFolder>) savedInstanceState.getSerializable("tracksFolders");
        } else { //this happens if app is launched by user
            tracksFolders = getTracksFoldersFromResources();
            initService();
        }
        return tracksFolders;
    }

    @尼克·福特斯库,@ranjan,谢谢你们的建议,但tracksfolders永远不会为空。我已经编辑了类(您可以在下面的“updated class:”中看到它),并使用@nonnull注释将tracks文件夹实例化分离到另一个方法中。我已经用这些更改更新了应用程序,后来用相同的日志得到了相同的npe。我知道这是在用户身上测试应用程序最糟糕的方法,但我别无选择。如果您是对的,日志会说getTracksFoldersAndInitService方法中抛出了异常。但它没有。因此,问题出在适配器上。如果我错了就纠正我。

    1 回复  |  直到 6 年前
        1
  •  0
  •   Nick Fortescue    6 年前

    发生在 GridAdapter.getCount() 并不意味着getCount()返回空值。这意味着它正在访问一个空值。自从你上传了你的代码(太棒了!)我们可以看到只有两个可能的问题:

    • trackFolders 是 null ,所以当你访问它时,你会得到一个npe
    • 跟踪文件夹 返回A 无效的 整数,所以当它转换为 int 你得到了NPE

    第二种选择是不可能的,因为 .size() 关于一个 ArrayList 也返回一个int,所以它必须是第一个选项。

    跟踪文件夹 在构造函数中设置,在 onCreate() 方法,从bundle、从saved状态或从 getTracksFolders() . 看起来像 getTracksFolders() 无法返回空值,因此我猜您的活动是以设置为空的意图启动的。我会在oncreate()方法中再次检查这个,如果它发生了,请采取适当的操作,或者用 new ArrayList() ?

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