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關於android studio app停止 問題

android studio android 手機 java #android studio
kzero 2020-05-18 05:59:14 ‧ 1920 瀏覽

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  • xImage

不太明白錯誤出在哪裏
我只要一按最後右下的botton(Calculation) 就直接彈app
這是在FourFrahment 和 activity_fouragment
沒有紅線不知道問題在哪

https://ithelp.ithome.com.tw/upload/images/20200518/20125832smngyd3AnW.jpg
程式介面設計如下：
MainActivity

package com.cww.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.view.WindowManager;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private static int SPLASH_SCREEN = 4000;

    //Variables
    Animation topAnim, bottomAnim;
    ImageView image;
    TextView logo, slogan;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_main);

        //Animations
        topAnim = AnimationUtils.loadAnimation(this,R.anim.top_animation);
        bottomAnim = AnimationUtils.loadAnimation(this,R.anim.bottom_animation);

        //Hooks
        image = findViewById(R.id.imageView);
        logo = findViewById(R.id.textView);
        slogan = findViewById(R.id.textView2);

        image.setAnimation(topAnim);
        logo.setAnimation(bottomAnim);
        slogan.setAnimation(bottomAnim);

        new Handler() .postDelayed(new Runnable() {
            @Override
            public void run() {
                Intent i = new Intent (MainActivity.this,Dashboard.class);
                startActivity(i);

                finish();

            }
        },SPLASH_SCREEN);

    }
}

FirstFrahment

package com.cww.myapplication;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;


/**
 * A simple {@link Fragment} subclass.
 */
public class FirstFragment extends Fragment {

    public FirstFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_first, container, false);
    }
}

FourFrahment

package com.cww.myapplication;

import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;


public class Fourfragment extends AppCompatActivity {
    private EditText mHeight;
    private EditText mWeight;
    private Button mCalculation;
    private TextView mAns;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fourfragment);
        initView();

    }

    private void initView() {
        mHeight = (EditText) findViewById(R.id.height);
        mWeight = (EditText) findViewById(R.id.weight);
        mCalculation = (Button) findViewById(R.id.calculation);
        mCalculation.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mAns.setText(calculationBmi());
            }
        });
        mAns = (TextView) findViewById(R.id.ans);
    }

    private String calculationBmi(){
        double bmi = 0;
        double weight = Double.valueOf(mWeight.getText().toString());
        double height = Double.valueOf(mHeight.getText().toString()) / 100;
        bmi = weight / Math.pow(height, 2);
        return String.valueOf(bmi);
    }
}

activity_dashborad

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
    tools:context=".Dashboard">

    <com.google.android.material.bottomnavigation.BottomNavigationView
        android:id="@+id/NavView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#FFFFFF"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:menu="@menu/bottom_menu"/>

    <fragment
        android:id="@+id/fragment"
        android:name="androidx.navigation.fragment.NavHostFragment"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:defaultNavHost="true"
        app:layout_constraintBottom_toTopOf="@+id/bottomNavigationView"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="1.0"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.0"
        app:navGraph="@navigation/nav" />

</androidx.constraintlayout.widget.ConstraintLayout>

https://ithelp.ithome.com.tw/upload/images/20200518/20125832L5ENltWwWz.jpg

activity_fouragment

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    tools:context=".Fourfragment"
    android:orientation="vertical">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_marginTop="20dp">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_gravity="center"
            android:gravity="right"
            android:text="height："
            android:textColor="#424242"
            android:textSize="22dp"/>
        <EditText
            android:id="@+id/height"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:layout_gravity="center"
            android:inputType="number"
            android:hint="input your height"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_gravity="center"
            android:text="cm"
            android:textColor="#424242"
            android:textSize="22dp"/>
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50dp">
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_gravity="center"
            android:gravity="right"
            android:text="weight："
            android:textColor="#424242"
            android:textSize="22dp"/>
        <EditText
            android:id="@+id/weight"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="2"
            android:layout_gravity="center"
            android:inputType="number"
            android:hint="input your weight"/>
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_gravity="center"
            android:text="kg"
            android:textColor="#424242"
            android:textSize="22dp"/>
    </LinearLayout>


    <Button
        android:id="@+id/calculation"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:layout_gravity="center"
        android:textSize="20dp"
        android:text="Calculation"/>


    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp">

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_gravity="center"
            android:gravity="right"
            android:text="Result："
            android:textColor="#424242"
            android:textSize="22dp"/>

        <TextView
            android:id="@+id/ans"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:layout_gravity="center"
            android:textColor="#424242"
            android:textSize="22dp"/>
    </LinearLayout>
  </LinearLayout>

https://ithelp.ithome.com.tw/upload/images/20200518/20125832IJPv0a5xnS.jpg

bottom_menu

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android">

    <item
        android:id="@+id/firstFragment"
        android:icon="@drawable/ic_home_black_24dp"
        android:title="Home"/>

    <item
        android:id="@+id/secondFragment"
        android:icon="@drawable/ic_subtitles_black_24dp"
        android:title="Calendar"/>

    <item
        android:id="@+id/thirdFragment"
        android:icon="@drawable/ic_restaurant_menu_black_24dp"
        android:title="Calorie Meal Plan"/>
    <item
        android:id="@+id/fourFragment"
        android:icon="@drawable/ic_calculation"
        android:title="Calculation"/>
</menu>

https://ithelp.ithome.com.tw/upload/images/20200518/20125832ixfv3YCIlr.jpg

nav

<?xml version="1.0" encoding="utf-8"?>
<navigation 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:id="@+id/nav"
    app:startDestination="@id/firstFragment">
    <fragment
        android:id="@+id/firstFragment"
        android:name="com.cww.myapplication.FirstFragment"
        android:label="fragment_first"
        tools:layout="@layout/fragment_first" />
    <fragment
        android:id="@+id/secondFragment"
        android:name="com.cww.myapplication.SecondFragment"
        android:label="fragment_second"
        tools:layout="@layout/fragment_second" />
    <fragment
        android:id="@+id/thirdFragment"
        android:name="com.cww.myapplication.ThirdFragment"
        android:label="fragment_third"
        tools:layout="@layout/fragment_third" />
    <fragment
        android:id="@+id/fourFragment"
        android:name="com.cww.myapplication.Fourfragment"
        android:label="fragment_four"
        tools:layout="@layout/activity_fourfragment" />
</navigation>
大鼻瑋瑋 iT邦新手 4 級 ‧ 2020-05-18 08:12:08 檢舉
錯誤訊息...
pinglam iT邦新手 5 級 ‧ 2020-05-18 09:33:42 檢舉
沒有 debugger ?
BMG50 iT邦新手 5 級 ‧ 2020-06-09 16:59:20 檢舉
建議你先查一下Activity 跟Fragment的分別。
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