Android应用程序在Pie上显示Textview错误，但在Oreo上运行良好

分类：编程问答

如何解决Android应用程序在Pie上显示Textview错误，但在Oreo上运行良好

我的应用程序在Oreo上运行良好，但在Android Pie上的特定Textview上给出了Null指针异常，为了找到问题，我尝试注释掉问题Textview，但尽管有这些之上的textview也不会引发任何错误。我只是无法弄清楚问题是什么，如果有的话，它应该在每台设备上崩溃。也许我需要更改manifest或app.gradle文件中的内容，才能在更高的api级别上运行它？任何帮助将不胜感激，因为我下周有我的五年计划：（

 @SuppressLint({"WrongViewCast","SetTextI18n"})
@RequiresApi(api = Build.VERSION_CODES.KITKAT)
public void Showpopup(View v) {


    final Spinner activity;
    RadioButton radiomal,radiofemal;
    EditText feet,inch,weiht,age;
    final TextView textview,save,fulname,result1,result2,result3,result4,com,carbs,protien,fat,water;


    mydialog.setContentView(R.layout.resultpopup);
    textview = mydialog.findViewById(R.id.close);
    activity = (Spinner) findViewById(R.id.spinner1);
    save = mydialog.findViewById(R.id.save);
    fulname = (TextView) mydialog.findViewById(R.id.fullname);
    radiomal = findViewById(R.id.radiomal);
    radiofemal = (RadioButton) findViewById(R.id.radiofemal);
    feet = (EditText) findViewById(R.id.feet);
    age = (EditText) findViewById(R.id.age);
    inch = (EditText) findViewById(R.id.inches);
    com = (TextView) mydialog.findViewById(R.id.comment);
    weiht = (EditText) findViewById(R.id.weight);
    gen = (TextView) mydialog.findViewById(R.id.gen);
    result1 = (TextView) mydialog.findViewById(R.id.bmi);
    result2 =  mydialog.findViewById(R.id.bmr);
    result3 = (TextView) mydialog.findViewById(R.id.healthy);
    result4 = (TextView) mydialog.findViewById(R.id.calorie);
    carbs = (TextView) mydialog.findViewById(R.id.carbs);
    protien = (TextView) mydialog.findViewById(R.id.protien);
    fat = (TextView) mydialog.findViewById(R.id.fat);
    water = (TextView) mydialog.findViewById(R.id.water);

    DecimalFormat precision = new DecimalFormat("0.00");

    String f = feet.getText().toString();
    String i = inch.getText().toString();
    String w = weiht.getText().toString();
    String a = age.getText().toString();


    if (TextUtils.isEmpty(f)) {
        Toast.makeText(caloriecalc2.this," Enter full Height",Toast.LENGTH_SHORT).show();
        return;
    }
    if (TextUtils.isEmpty(i)) {
        Toast.makeText(caloriecalc2.this,Toast.LENGTH_SHORT).show();
        return;
    }
    if (TextUtils.isEmpty(w)) {
        Toast.makeText(caloriecalc2.this," Please Enter Weight",Toast.LENGTH_SHORT).show();
        return;
    }
    if (TextUtils.isEmpty(a)) {
        Toast.makeText(caloriecalc2.this," Please enter Age",Toast.LENGTH_SHORT).show();
        return;
    }
    if (radiomal.isChecked() || radiofemal.isChecked()) {//No Radio Button Is Checked


        int ft = Integer.parseInt(f);
        int in = Integer.parseInt(i);
        int ag = Integer.parseInt(a);

        float h = (float) (((ft * 12) + in) * 2.54);
        if (f != null && !"".equals(f) && i != null && !"".equals(i) && w != null && !"".equals(w)) {
            float wf = Float.parseFloat(w);
            float bmi = (wf / (h * h)) * 10000;
            result1.setText(precision.format(bmi));


            if (bmi < 18.5) {
                com.setText("You are Underweight");
            } else if (bmi >= 18.5 && bmi <= 24.9) {
                com.setText("You have a Healthy Weight");
            } else if (bmi >= 25) {
                com.setText("You are Overweight");
            }

        }
        if (f != null && !"".equals(f) && i != null && !"".equals(i)) {
            if (radiomal.isChecked()) {
                float hea = (float) (56.2 + (in * 1.41));
                result3.setText(precision.format(hea));
            } else if (radiofemal.isChecked()) {
                float hea = (float) (53.1 + (in * 1.36));
                result3.setText(precision.format(hea));
            }

        }
        if (a != null && !"".equals(a) && i != null && !"".equals(i) && f != null && !"".equals(f) && w != null && !"".equals(w)) {
            float wf = Float.parseFloat(w);
            float bmi = (wf / (h * h)) * 10000;
            if (radiomal.isChecked()) {

                float cal = (float) ((float) 88.36 + (13.39 * wf) + (4.799 * h) - (5.677 * ag));
                result4.setText(precision.format(cal));

                if (arr == 0) {
                    cal = (float) ((float) 88.36 + (13.39 * wf) + (4.799 * h) - (5.677 * ag));
                    result2.setText(precision.format(cal));


                    if (bmi < 18.5) {
                        float car = (float) (cal * 0.45);
                        carbs.setText((precision.format(car)));
                        float pro = (float) (cal * 0.35);
                        protien.setText(precision.format(pro));
                        float fa = (float) (cal * 0.20);
                        fat.setText(precision.format(fa));
                    } else if (bmi >= 18.5 && bmi <= 24.9) {
                        float car = (float) (cal * 0.50);
                        carbs.setText((precision.format(car)));
                        float pro = (float) (cal * 0.25);
                        protien.setText(precision.format(pro));
                        float fa = (float) (cal * 0.25);
                        fat.setText(precision.format(fa));

                    } else if (bmi >= 25) {
                        float car = (float) (cal * 0.35);
                        carbs.setText((precision.format(car)));
                        float pro = (float) (cal * 0.40);
                        protien.setText(precision.format(pro));
                        float fa = (float) (cal * 0.25);
                        fat.setText(precision.format(fa));

                    }

                } else if (arr == 1) {
                    cal = (float) (((float) 88.36 + (13.39 * wf) + (4.799 * h) - (5.677 * ag)) * 1.2);
                    result2.setText(precision.format(cal));

result2.setText（precision.format（cal））;这是特定的行

Resultpopup布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/layout_bg"
android:padding="5dp"
android:outlineAmbientShadowColor="#F4C599"
android:outlineSpotShadowColor="@color/colorAccent"
android:scrollbars="vertical"
android:scrollbarAlwaysDrawVerticalTrack="true"
android:orientation="vertical"
android:layout_gravity="center"
>
<RelativeLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">

<TextView
    android:layout_width="30dp"
    android:layout_height="30dp"
    android:id="@+id/close"
    android:textColor="#F47507"
    android:text="X"
    android:textSize="20dp"
    android:layout_marginRight="10dp"
    android:layout_marginTop="5dp"
    android:layout_alignParentRight="true"
    android:textStyle="bold"
    android:fontFamily="@font/poppins"
    android:layout_gravity="end"
    android:gravity="center"
    android:background="@drawable/circlebackground"
   />
 <TextView
    android:layout_width="30dp"
    android:layout_height="30dp"
    android:id="@+id/save"
    android:textColor="#F47507"
    android:layout_marginTop="5dp"
    android:textSize="20dp"
    android:layout_marginLeft="7dp"
    android:layout_marginRight="10dp"
    android:layout_alignParentLeft="true"
    android:textStyle="bold"
    android:fontFamily="@font/poppins"
    android:gravity="center"
    android:backgroundTint="@color/colorAccent"
    android:background="@drawable/ic_baseline_save_24"
    />
 </RelativeLayout>

 <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="5dp"
    android:orientation="vertical">

    <ImageView
        android:id="@+id/profile"
        android:layout_width="369dp"
        android:layout_height="134dp"
        android:layout_gravity="center"
        android:layout_marginTop="15dp"
    />

    <TextView
        android:id="@+id/fullname"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:layout_marginTop="5dp"
        android:fontFamily="@font/poppins"
        android:text="Name"
        android:textColor="#FA7C11"
        android:textSize="20sp"
        android:textStyle="bold" />


</LinearLayout>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="8dp"
    android:orientation="horizontal">
<LinearLayout
android:layout_weight="1"
android:layout_width="0dp"
android:gravity="center"
android:background="#F45A67"
android:layout_height="100dp"
android:orientation="vertical">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="BMI"
    android:textSize="18sp"
    android:textColor="#fff"
    />
<TextView
    android:id="@+id/bmi"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Null"
    android:textSize="18sp"
    android:textColor="#fff"
    />


 </LinearLayout>
    <LinearLayout
        android:layout_weight="1"
        android:layout_width="0dp"
        android:gravity="center"
        android:background="#6CA0F8"
        android:layout_height="100dp"
        android:orientation="vertical">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="BMR"
            android:textSize="18sp"
            android:textColor="#fff"
            />
        <TextView
            android:id="@+id/bmr"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Null"
            android:textSize="18sp"
            android:textColor="#fff"
            />


    </LinearLayout>
    <LinearLayout
        android:layout_weight="1"
        android:layout_width="0dp"
        android:gravity="center"
        android:background="#0AC1EF"
        android:layout_height="100dp"
        android:orientation="vertical">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Water (ltr)"
            android:textSize="18sp"
            android:textColor="#fff"
            />
        <TextView
            android:id="@+id/water"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Null"
            android:textSize="18sp"
            android:textColor="#fff"
            />


    </LinearLayout>





</LinearLayout>




    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:orientation="horizontal">

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="100dp"
            android:layout_weight="1"
            android:background="#29AE05"
            android:gravity="center"
            android:orientation="vertical">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Healthy Weight"
                android:textColor="#fff"
                android:textSize="18sp" />

            <TextView
                android:id="@+id/healthy"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Null"
                android:textColor="#fff"
                android:textSize="18sp" />


        </LinearLayout>

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="100dp"
            android:layout_weight="1"
            android:background="#FA8B35"
            android:gravity="center"
            android:orientation="vertical">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Calorie Intake"
                android:textColor="#fff"
                android:textSize="18sp" />

            <TextView
                android:id="@+id/calorie"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Null"
                android:textColor="#fff"
                android:textSize="18sp" />


        </LinearLayout>

  </LinearLayout>
   <TextView
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Macro's Breakdown"
    android:textAlignment="center"
    android:layout_marginTop="10dp"
    android:textSize="20sp"
    android:textStyle="bold"
    android:textColor="#F87302"
    android:fontFamily="@font/poppins"/>


  <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="90dp"
    android:layout_marginTop="10dp"
    android:orientation="horizontal">
    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:layout_weight="1"
        android:background="#474745"
        android:gravity="center"
        android:orientation="vertical">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Protien"
            android:textColor="#fff"
            android:textSize="18sp" />

        <TextView
            android:id="@+id/protien"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Null"
            android:textColor="#fff"
            android:textSize="18sp" />


    </LinearLayout>
    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:layout_weight="1"
        android:background="#052AAE"
        android:gravity="center"
        android:orientation="vertical">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Carbohydrate"
            android:textColor="#fff"
            android:textSize="18sp" />

        <TextView
            android:id="@+id/carbs"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Null"
            android:textColor="#fff"
            android:textSize="18sp" />


    </LinearLayout>
    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="100dp"
        android:layout_weight="1"
        android:background="#ED0858"
        android:gravity="center"
        android:orientation="vertical">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Fat"
            android:textColor="#fff"
            android:textSize="18sp" />

        <TextView
            android:id="@+id/fat"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Null"
            android:textColor="#fff"
            android:textSize="18sp" />


    </LinearLayout>





</LinearLayout>



<TextView
    android:id="@+id/comment"
    android:layout_width="match_parent"
    android:layout_height="37dp"
    android:fontFamily="@font/poppins"
    android:layout_marginTop="30dp"
    android:gravity="center"
    android:text="You are Healthy Weight"
    android:textColor="#FA7C11"
    android:textSize="22sp"
    android:textStyle="bold" />

这是错误

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.login,PID: 7007
java.lang.IllegalStateException: Could not execute method for android:onClick
    at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:414)
    at android.view.View.performClick(View.java:6597)
    at android.view.View.performClickInternal(View.java:6574)
    at android.view.View.access$3100(View.java:778)
    at android.view.View$PerformClick.run(View.java:25885)
    at android.os.Handler.handleCallback(Handler.java:873)
    at android.os.Handler.dispatchMessage(Handler.java:99)
    at android.os.Looper.loop(Looper.java:193)
    at android.app.ActivityThread.main(ActivityThread.java:6669)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
 Caused by: java.lang.reflect.InvocationTargetException
    at java.lang.reflect.Method.invoke(Native Method)
    at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:409)
    at android.view.View.performClick(View.java:6597) 
    at android.view.View.performClickInternal(View.java:6574) 
    at android.view.View.access$3100(View.java:778) 
    at android.view.View$PerformClick.run(View.java:25885) 
    at android.os.Handler.handleCallback(Handler.java:873) 
    at android.os.Handler.dispatchMessage(Handler.java:99) 
    at android.os.Looper.loop(Looper.java:193) 
    at android.app.ActivityThread.main(ActivityThread.java:6669) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 
 Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
    at com.example.login.caloriecalc2.Showpopup(caloriecalc2.java:235)
    at java.lang.reflect.Method.invoke(Native Method) 
    at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:409) 
    at android.view.View.performClick(View.java:6597) 
    at android.view.View.performClickInternal(View.java:6574) 
    at android.view.View.access$3100(View.java:778) 
    at android.view.View$PerformClick.run(View.java:25885) 
    at android.os.Handler.handleCallback(Handler.java:873) 
    at android.os.Handler.dispatchMessage(Handler.java:99) 
    at android.os.Looper.loop(Looper.java:193) 
    at android.app.ActivityThread.main(ActivityThread.java:6669) 
    at java.lang.reflect.Method.invoke(Native Method) 
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858) 

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