您好我正在尝试使用Retrofit解析JSON,将其保存在Sqlite上并显示在RecyclerView上 . 但是,当我尝试打开活动时,我的应用程序崩溃了 . 以下是我的相关活动的完整代码 . 你能帮我解决一下这个问题吗?谢谢
public class InventoryProductActivity extends AppCompatActivity implements InventoryProductListAdapter.CustomClickListener {
private static final String TAG = InventoryProductActivity.class.getSimpleName();
private InventoryProductListAdapter mInventoryProductListAdapter;
private RecyclerView mRecyclerView;
private RetrofitClient mRetrofitClient;
LinearLayoutManager mLinearLayoutManager;
private WarehouseDatabase mDatabase;
private ProgressDialog mProgressDialog;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_inventory_product);
configViews();
mRetrofitClient = new RetrofitClient();
mDatabase = new WarehouseDatabase(this);
loadInventoryProductFeed();
}
private void configViews() {
mRecyclerView = findViewById(R.id.recycler_view_inventory_product);
mRecyclerView.setHasFixedSize(true);
mLinearLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLinearLayoutManager);
mInventoryProductListAdapter = new InventoryProductListAdapter(this);
mRecyclerView.setAdapter(mInventoryProductListAdapter);
}
private void loadInventoryProductFeed() {
mProgressDialog = new ProgressDialog(InventoryProductActivity.this);
mProgressDialog.setMessage("Loading Inventory Data...");
mProgressDialog.setCancelable(true);
mProgressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
mProgressDialog.setIndeterminate(true);
mProgressDialog.show();
mInventoryProductListAdapter.reset();
if (getNetworkAvailability()) {
getFeed();
} else {
getFeedFromDatabase();
}
}
private void getFeed() {
Call<List<InventoryProductModel>> listCall = mRetrofitClient.getWarehouseServiceInventoryProduct().getAllInventoryProducts();
listCall.enqueue(new Callback<List<InventoryProductModel>>() {
@Override
public void onResponse(Call<List<InventoryProductModel>> call, Response<List<InventoryProductModel>> response) {
if (response.isSuccessful()) {
List<InventoryProductModel> inventoryProductModelList = response.body();
for (int i = 0; i < inventoryProductModelList.size(); i++) {
InventoryProductModel inventoryProductModel = inventoryProductModelList.get(i);
mInventoryProductListAdapter.notifyDataSetChanged();
}
} else {
int sc = response.code();
switch (sc) {
}
}
mProgressDialog.dismiss();
}
@Override
public void onFailure(Call<List<InventoryProductModel>> call, Throwable t) {
mProgressDialog.dismiss();
Toast.makeText(getApplicationContext(), t.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
private void getFeedFromDatabase() {
List<InventoryProductModel> inventoryProductModelList = mDatabase.getInventoryProducts();
for (int i = 0; i < inventoryProductModelList.size(); i++) {
InventoryProductModel inventoryProductModel = inventoryProductModelList.get(i);
Log.d(TAG, inventoryProductModel.getName() + "||" + inventoryProductModel.getCountryId());
}
mProgressDialog.dismiss();
}
private boolean getNetworkAvailability() {
return Utils.isNetworkAvailable(getApplicationContext());
}
@Override
public void onClick(int position) {
}
}
E / WindowManager:android.view.WindowLeaked:Activity codes.bala.bmsfinal1.activity.MainActivity泄露窗口DecorView @ 52c3fcd []最初是在android.view.ViewRootImpl上添加的 . (ViewRootImpl.java:418)at android .view.WindowManagerGlobal.addView(WindowManagerGlobal.java:331)位于android.app.Dialog.show(Dialog.java:322)的android.view.WindowManagerImpl.addView(WindowManagerImpl.java:93),位于android.app.ProgressDialog . 在codes.bala.bmsfinal1.activity的codes.bala.bmsfinal1.activity.MainActivity.login(MainActivity.java:61)的android.app.ProgressDialog.show(ProgressDialog.java:104)上显示(ProgressDialog.java:116) .MainActivity $ 1.onClick(MainActivity.java:41)在Android.view.Handler的android.view.View $ PerformClick.run(View.java:22429)上的android.view.View.performClick(View.java:5637) .handleCallback(Handler.java:751)在Android.os.Handler.dispatchMessage(Handler.java:95)的android.app.Looper.loop(Looper.java:154)android.app.ActivityThread.main(ActivityThread . java:6119)at来自com.android.internal.os.ZygoteInit.main(ZygoteInit.java)的com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:886)中的java.lang.reflect.Method.invoke(Native Method) :776)I / ViewConfigCompat:无法在ViewConfiguration D / AndroidRuntime上找到方法getScaledScrollFactor():关闭VM ---------崩溃开始E / AndroidRuntime:FATAL EXCEPTION:main进程:codes.bala.bmsfinal1 ,PID:12077 java.lang.RuntimeException:无法启动活动ComponentInfo {codes.bala.bmsfinal1 / codes.bala.bmsfinal1.activity.InventoryProductActivity}:java.lang.NullPointerException:尝试调用接口方法'retrofit2.Call代码 . bala.bmsfinal1.iinterface.WarehouseService.getAllInventoryProducts()'在Android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726)的android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2665)上的空对象引用 . android.app.ActivityThre上的app.ActivityThread.-wrap12(ActivityThread.java) ad.H.handleMessage(ActivityThread.java:1477)位于android.app.AutT.read上的android.O.Roper.loop(Looper.java:154)上的android.os.Handler.dispatchMessage(Handler.java:102) (ActivityThread.java:6119)位于com.android.internal.os的com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:886)的java.lang.reflect.Method.invoke(Native Method) .ZygoteInit.main(ZygoteInit.java:776)引起:java.lang.NullPointerException:尝试在代码的空对象引用上调用接口方法'retrofit2.Call codes.bala.bmsfinal1.iinterface.WarehouseService.getAllInventoryProducts()' .bala.bmsfinal1.activity.InventoryProductActivity.getFeed(InventoryProductActivity.java:88)at codes.bala.bmsfinal1.activity.InventoryProductActivity.loadInventoryProductFeed(InventoryProductActivity.java:70)at codes.bala.bmsfinal1.activity.InventoryProductActivity.onCreate(InventoryProductActivity) .java:46)在android.app.Instrument的android.app.Activity.performCreate(Activity.java:6679)位于android.app.A活动时的android.app.ActivityThread.perleLaunchActivity(ActivityThread.java:2618)的ation.callActivityOnCreate(Instrumentation.java:1118),android.app.ActivityThread.-wrap12的android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2726) ActivityThread.java)在Android.os.Looper.loop(Looper.java:154)的android.app.Handler.dispatchMessage(Handler.java:102)上的android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1477) )来自android.app.ActivityThread.main(ActivityThread.java:6119)的java.lang.reflect.Method.invoke(Native Method),位于com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:886) )在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)应用程序终止 .
1 回答
方法返回
null
. 您应该在此方法中设置断点并检查发生的情况(或向此方法添加一些日志) .