小编Kir*_*lvi的帖子

当我试图在手机上运行我的应用程序时,当我试图从一个活动转到其他它的投掷错误Unfortunately app has stopped !&当我在Logcat中检查时,我收到以下错误消息...

12-07 03:12:57.958  17518-17518/com.android.mads.madses E/AndroidRuntime? FATAL EXCEPTION: main
    Process: com.android.mads.madses, PID: 17518
    java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v7/internal/widget/TintManager;
            at android.support.design.widget.TabLayout$TabView.<init>(TabLayout.java:1145)
            at android.support.design.widget.TabLayout.createTabView(TabLayout.java:635)
            at android.support.design.widget.TabLayout.addTabView(TabLayout.java:669)
            at android.support.design.widget.TabLayout.addTab(TabLayout.java:365)
            at android.support.design.widget.TabLayout.addTab(TabLayout.java:340)
            at android.support.design.widget.TabLayout.setTabsFromPagerAdapter(TabLayout.java:624)
            at android.support.design.widget.TabLayout.setupWithViewPager(TabLayout.java:595)
            at com.android.mads.madses.RegisterActivity.onCreate(RegisterActivity.java:35)
            at android.app.Activity.performCreate(Activity.java:5953)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1128)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2267)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2388)
            at android.app.ActivityThread.access$800(ActivityThread.java:148)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1292)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5312)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v7.internal.widget.TintManager" on path: DexPathList[[zip file "/data/app/com.android.mads.madses-2/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
            at …

我想将我的基于 C# windows 的应用程序连接到 firebase 实时数据库。有没有方便的图书馆来做同样的事情？或者有没有更好的方法来做到这一点？

我想在加空字段验证EditText上AlertDialog。但是即使字段为空，也不会显示错误消息，而是AlertDialog is closing. But if conditions are working well as I'm not able to do post operations if any of the field is empty.

这是我的Java示例代码：

public class TourActivity extends AppCompatActivity {

private LayoutInflater inflater;
private FloatingActionButton fab;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_tour);
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    fab = (FloatingActionButton) findViewById(R.id.fab);

    fab.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            inflater = TourActivity.this.getLayoutInflater();
            View content = inflater.inflate(R.layout.activity_add_new_trip, null);
            final EditText editEvent …

我正在使用 datepicker，但是每当我选择任何日期时，它都会显示 -1 个月。例如-如果我选择 12/12/2016，它将显示在文本框中 12/11/2016 如果我选择 3/1/2017，它将显示 3/0/2017

这是我的日期选择器对话框代码：

editStartDate.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    Calendar mcurrentDate = Calendar.getInstance();
                    int mYear = mcurrentDate.get(Calendar.YEAR);
                    int mMonth = mcurrentDate.get(Calendar.MONTH);
                    int mDay = mcurrentDate.get(Calendar.DAY_OF_MONTH);

                    DatePickerDialog mDatePicker = new DatePickerDialog(TourActivity.this, new DatePickerDialog.OnDateSetListener() {
                        public void onDateSet(DatePicker datepicker, int selectedyear, int selectedmonth, int selectedday) {
                            Calendar newDate = Calendar.getInstance();
                            newDate.set(selectedyear, selectedmonth, selectedday);
                            editStartDate.setText(selectedday + "/" + selectedmonth + "/" + selectedyear);
                        }
                    }, mYear, mMonth, mDay);
                    mDatePicker.setTitle("Select date");
                    mDatePicker.show();

                }
            }); …

我创建了注册页面,看起来像这样

现在我的要求是,我想只有当用户填写了表单中的所有细节时才能看到Next Button.我怎样才能做到这一点？