当 android 模拟器运行时，它显示空白屏幕

时间：2021-06-08 02:53:10

标签： java android android-emulator

我创建了一个活动来编辑 some data，点击编辑按钮它会将其密钥发送到另一个活动。我的所有活动都正常工作，除了这个特定的活动，除了 blank screen 之外不显示任何内容。

这些是我出现问题的代码。

jadual_Activity_EditSlot_Pengajar.java

package com.example.karismatuitioncentre.jadual.j_pengajar;

import android.app.TimePickerDialog;
import android.content.Intent;
import android.os.Bundle;
import android.text.format.DateFormat;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import com.example.karismatuitioncentre.R;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import java.util.Calendar;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;        

    public class Jadual_Activity_EditSlot_Pengajar extends AppCompatActivity {

EditText et_editSlot_subjek,et_editSlot_pengajar;
Button btn_editSlot_submit,btn_editSlot_back;
TextView tvTimeBeforeSet,tvTimeAfterSet,tvEditSlot_masaStart,tvEditSlot_masaEnd,tvSubjectSet,tvPengajarSet;
int t1Hour,t1Minute,t2Hour,t2Minute;


protected void OnCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_hari_editslot_pengajar);
    String day_key=getIntent().getStringExtra("day_key");
    String slot_key=getIntent().getStringExtra("slot_key");

    tvSubjectSet= findViewById(R.id.tvSubjectSet);
    tvPengajarSet= findViewById(R.id.tvPengajarSet);
    tvTimeBeforeSet= findViewById(R.id.tvTimeBeforeSet);
    tvTimeAfterSet= findViewById(R.id.tvTimeAfterSet);
    et_editSlot_subjek= findViewById(R.id.et_editSlot_subjek);
    et_editSlot_pengajar= findViewById(R.id.et_editSlot_pengajar);
    tvEditSlot_masaStart= findViewById(R.id.tvEditSlot_masaStart);
    tvEditSlot_masaEnd= findViewById(R.id.tvEditSlot_masaEnd);
    btn_editSlot_submit= findViewById(R.id.btn_editSlot_submit);

    FirebaseDatabase.getInstance().getReference().child(day_key).child(slot_key).addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(@NonNull DataSnapshot snapshot) {
            if (snapshot.exists()){
                String SubjectSet= Objects.requireNonNull(snapshot.child("subjek").getValue()).toString();
                String PengajarSet= Objects.requireNonNull(snapshot.child("pengajar").getValue()).toString();
                String HourBeforeSet= Objects.requireNonNull(snapshot.child("masaSHour").getValue()).toString();
                String MinuteBeforeSet= Objects.requireNonNull(snapshot.child("masaSMin").getValue()).toString();
                String HourAfterSet= Objects.requireNonNull(snapshot.child("masaEHour").getValue()).toString();
                String MinuteAfterSet= Objects.requireNonNull(snapshot.child("masaEMin").getValue()).toString();


                int startH=Integer.parseInt(HourBeforeSet);
                int startM=Integer.parseInt(MinuteBeforeSet);
                int endH=Integer.parseInt(HourAfterSet);
                int endM=Integer.parseInt(MinuteAfterSet);

                tvSubjectSet.setText(SubjectSet);
                tvPengajarSet.setText(PengajarSet);

                Calendar calendar = Calendar.getInstance();
                calendar.set(0,0,0,startH,startM);
                tvTimeBeforeSet.setText(DateFormat.format("hh:mm aa",calendar));

                Calendar calendar1 = Calendar.getInstance();
                calendar1.set(0,0,0,endH,endM);
                tvTimeAfterSet.setText(DateFormat.format("hh:mm aa",calendar1));
            }
        }

        @Override
        public void onCancelled(@NonNull DatabaseError error) {

        }
    });


    tvEditSlot_masaStart.setOnClickListener(view -> {
        TimePickerDialog timePickerDialog=new TimePickerDialog(
                Jadual_Activity_EditSlot_Pengajar.this,
                (view1, hourOfDay, minute) -> {
                    t1Hour=hourOfDay;
                    t1Minute=minute;

                    Calendar calendar = Calendar.getInstance();
                    calendar.set(0,0,0,t1Hour,t1Minute);
                    tvEditSlot_masaStart.setText(DateFormat.format("hh:mm aa",calendar));


                },12,0,false
        );
        timePickerDialog.updateTime(t1Hour,t1Minute);

        timePickerDialog.show();
    });

    tvEditSlot_masaEnd.setOnClickListener(view -> {
        TimePickerDialog timePickerDialog=new TimePickerDialog(
                Jadual_Activity_EditSlot_Pengajar.this,
                (view1, hourOfDay, minute) -> {
                    t2Hour=hourOfDay;
                    t2Minute=minute;

                    Calendar calendar = Calendar.getInstance();
                    calendar.set(0,0,0,t2Hour,t2Minute);
                    tvEditSlot_masaEnd.setText(DateFormat.format("hh:mm aa",calendar));

                },12,0,false
        );
        timePickerDialog.updateTime(t2Hour,t2Minute);

        timePickerDialog.show();
    });
    btn_editSlot_submit.setOnClickListener(view -> {

        Map<String,Object> map=new HashMap<>();
        map.put("subjek",et_editSlot_subjek.getText().toString());
        map.put("pengajar",et_editSlot_pengajar.getText().toString());
        map.put("masaSHour",t1Hour);
        map.put("masaEHour",t2Hour);
        map.put("masaSMin",t1Minute);
        map.put("masaEMin",t2Minute);


        FirebaseDatabase.getInstance().getReference().child(day_key).child(slot_key)
                .setValue(map)
                .addOnSuccessListener(aVoid -> {
                    et_editSlot_subjek.setText("");
                    et_editSlot_pengajar.setText("");

                    Toast.makeText(getApplicationContext(),"Penambahan berjaya",Toast.LENGTH_LONG).show();

                    Intent intent = new Intent(getApplicationContext(), Jadual_Activity_ViewSchedule_Pengajar_Test.class);
                    intent.putExtra("day_key", day_key);
                    startActivity(intent);
                    finish();
                })
                .addOnFailureListener(e -> Toast.makeText(getApplicationContext(),"Tidak Berjaya",Toast.LENGTH_LONG).show());

    });

}

}

activity_hari_editslot_pengajar.java

<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.LinearLayoutCompat         xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:gravity="center"
android:background="@drawable/whitebg">
<TextView
    android:id="@+id/tvSubjectSet"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginTop="20sp"
    android:text="TextView"
    android:textSize="20sp" />

<EditText
    android:id="@+id/et_editSlot_subjek"
    android:layout_width="300dp"
    android:layout_height="wrap_content"
    android:layout_marginTop="20sp"
    android:layout_marginBottom="15dp"
    android:hint="Nama Subjek"
    android:inputType="text"
    android:textColor="#000"
    android:textColorHint="#95150D0D"
    android:textSize="20sp" />

<TextView
    android:id="@+id/tvPengajarSet"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="TextView"
    android:textSize="20sp" />

<EditText
    android:id="@+id/et_editSlot_pengajar"
    android:layout_width="300dp"
    android:layout_height="wrap_content"
    android:layout_marginTop="20sp"
    android:layout_marginBottom="15dp"
    android:hint="Nama Pengajar"
    android:inputType="text"
    android:textColor="#000"
    android:textColorHint="#95150D0D"
    android:textSize="20sp" />

<TextView
    android:id="@+id/tvTimeBeforeSet"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="TextView"
    android:textSize="20sp" />

<TextView
    android:id="@+id/tvEditSlot_masaStart"
    android:layout_width="300dp"
    android:layout_height="wrap_content"
    android:layout_marginTop="20sp"
    android:layout_marginBottom="15dp"
    android:background="#4BA8E697"
    android:drawablePadding="16dp"
    android:gravity="center"
    android:hint="Waktu Kelas Bermula"
    android:textColorHint="#95150D0D"
    android:textSize="20sp"
    android:textStyle="italic"
    app:drawableTopCompat="@drawable/ic_time" />

<TextView
    android:id="@+id/tvTimeAfterSet"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="TextView"
    android:textSize="20sp" />

<TextView
    android:id="@+id/tvEditSlot_masaEnd"
    android:layout_width="300dp"
    android:layout_height="wrap_content"
    android:layout_marginTop="20sp"
    android:layout_marginBottom="15dp"
    android:background="#68CDB1B0"
    android:drawablePadding="16dp"
    android:gravity="center"
    android:hint="Waktu Kelas Tamat"
    android:textColorHint="#95150D0D"
    android:textSize="20sp"
    android:textStyle="italic"
    app:drawableTopCompat="@drawable/ic_time" />

<Button
    android:id="@+id/btn_editSlot_submit"
    android:layout_width="150dp"
    android:layout_height="wrap_content"
    android:layout_marginTop="30dp"
    android:layout_marginBottom="15dp"
    android:background="#1E88E5"
    android:text="Hantar"
    android:textColor="#F6F6F6"
    android:textSize="20sp" />

<Button
    android:id="@+id/btn_editSlot_back"
    android:layout_width="150dp"
    android:layout_height="wrap_content"
    android:background="#00ACC1"
    android:text="Kembali"
    android:textColor="#FFFFFF"
    android:textSize="20sp" />




</androidx.appcompat.widget.LinearLayoutCompat>

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