TextView 不显示搜索栏

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【中文标题】TextView 不显示搜索栏【英文标题】：TextView not Displaying Seekbar 【发布时间】：2018-01-07 06:58:37 【问题描述】：

我现在刚刚遇到这个问题，我不知道如何解决这个问题。我创建了一个应用程序，可以计算四门学科（科学、数学、英语和编程）的平均值。用户可以使用搜索栏输入学生的成绩（搜索栏的最小值为 50%）。我还添加了切换按钮，可以包含或不包含选择的主题。问题是当我运行应用程序时，当我移动搜索栏时，文本视图（应该是显示搜索栏进度的那个）没有显示正确的值。它停留在 50。我做错了什么吗？顺便说一下，这是我的代码

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_
android:layout_
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.elijah.comp3labexercise9.MainActivity">

<TextView
    android:layout_
    android:layout_
    android:text="Student Grade Evaluation"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:textSize="25dp"
    android:gravity="center_horizontal"
    android:id="@+id/textView" />

<SeekBar
    android:layout_
    android:layout_
    android:id="@+id/seekSci"
    android:layout_marginTop="58dp"
    android:layout_below="@id/textView"
    android:layout_toLeftOf="@+id/toggleSci"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:max="50"
    android:progress="0"
    android:indeterminate="false" />

<ToggleButton
    android:layout_
    android:layout_
    android:text="New ToogleButton"
    android:id="@+id/toggleSci"
    android:layout_alignBottom="@id/seekSci"
    android:layout_alignRight="@id/textView"
    android:layout_alignEnd="@id/textView"
    android:textOff="Not Included"
    android:textOn="Included"
    android:checked="false" />

<SeekBar
    android:layout_
    android:layout_
    android:id="@+id/seekMath"
    android:layout_marginTop="52dp"
    android:layout_below="@id/seekSci"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignRight="@id/seekSci"
    android:layout_alignEnd="@id/seekSci"
    android:max="50"
    android:progress="0"
    android:indeterminate="false" />

<ToggleButton
    android:layout_
    android:layout_
    android:text="New ToogleButton"
    android:id="@+id/toggleMath"
    android:layout_alignBottom="@id/seekMath"
    android:layout_alignLeft="@id/toggleSci"
    android:layout_alignStart="@id/toggleSci"
    android:textOff="Not Included"
    android:textOn="Included"
    android:checked="false" />

<TextView
    android:layout_
    android:layout_
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="Science: 50%"
    android:id="@+id/txtSci"
    android:layout_alignTop="@id/toggleSci"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignRight="@id/seekSci"
    android:layout_alignEnd="@id/seekSci" />


<TextView
    android:layout_
    android:layout_
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="Mathematics: 50%"
    android:id="@+id/txtMath"
    android:layout_alignTop="@id/toggleMath"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignRight="@id/seekMath"
    android:layout_alignEnd="@id/seekMath" />

<ToggleButton
    android:layout_
    android:layout_
    android:text="New ToogleButton"
    android:id="@+id/toggleEng"
    android:layout_below="@id/toggleMath"
    android:layout_alignLeft="@id/toggleMath"
    android:layout_alignStart="@id/toggleMath"
    android:layout_marginTop="27dp"
    android:textOff="Not Included"
    android:textOn="Included"
    android:checked="false" />

<SeekBar
    android:layout_
    android:layout_
    android:id="@+id/seekEng"
    android:layout_alignBottom="@id/toggleEng"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignRight="@id/seekMath"
    android:layout_alignEnd="@id/seekMath"
    android:max="50"
    android:progress="0"
    android:indeterminate="false" />

<TextView
    android:layout_
    android:layout_
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="English: 50%"
    android:id="@+id/txtEng"
    android:layout_alignTop="@id/toggleEng"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignRight="@id/seekEng"
    android:layout_alignEnd="@id/seekEng" />

<ToggleButton
    android:layout_
    android:layout_
    android:text="New ToogleButton"
    android:id="@+id/toggleProg"
    android:layout_below="@id/toggleEng"
    android:layout_alignLeft="@id/toggleEng"
    android:layout_alignStart="@id/toggleEng"
    android:layout_marginTop="32dp"
    android:textOff="Not Included"
    android:textOn="Included"
    android:checked="false" />

<SeekBar
    android:layout_
    android:layout_
    android:id="@+id/seekProg"
    android:layout_alignBottom="@id/toggleProg"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignRight="@id/seekEng"
    android:layout_alignEnd="@id/seekEng"
    android:max="50"
    android:progress="0"
    android:indeterminate="false" />

<TextView
    android:layout_
    android:layout_
    android:textAppearance="?android:attr/textAppearanceMedium"
    android:text="Programming: 50%"
    android:id="@+id/txtProg"
    android:layout_above="@id/seekProg"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignRight="@id/seekProg"
    android:layout_alignEnd="@id/seekProg" />

<Button
    android:layout_
    android:layout_
    android:text="CALCULATE"
    android:id="@+id/btnCalc"
    android:layout_below="@id/seekProg"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_marginTop="31dp"
    android:layout_alignRight="@+id/seekProg"
    android:layout_alignEnd="@id/toggleProg" />

<TextView
    android:layout_
    android:layout_
    android:textAppearance="?android:attr/textAppearanceLarge"
    android:text="Average: No Grade"
    android:id="@+id/txtResult"
    android:layout_below="@id/btnCalc"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_alignRight="@id/btnCalc"
    android:layout_alignEnd="@id/btnCalc"
    android:layout_marginTop="10dp"
    android:textColor="#2a34f4"/>

MainActivity.java

package com.example.elijah.comp3labexercise9;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.ToggleButton;

public class MainActivity extends AppCompatActivity 

ToggleButton togSci, togMath, togEng, togPro;
SeekBar skSci, skMath, skEng, skPro;
TextView etSci, etMath, etEng, etPro, etRes;
Button calc;

@Override
protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    togSci = (ToggleButton) findViewById (R.id.toggleSci);
    togMath = (ToggleButton) findViewById (R.id.toggleMath);
    togEng = (ToggleButton) findViewById (R.id.toggleEng);
    togPro = (ToggleButton) findViewById (R.id.toggleProg);

    skSci = (SeekBar) findViewById (R.id.seekSci);
    skMath = (SeekBar) findViewById (R.id.seekMath);
    skEng = (SeekBar) findViewById (R.id.seekEng);
    skPro = (SeekBar) findViewById (R.id.seekProg);

    etSci = (TextView) findViewById (R.id.txtSci);
    etMath = (TextView) findViewById (R.id.txtMath);
    etEng = (TextView) findViewById (R.id.txtEng);
    etPro = (TextView) findViewById (R.id.txtProg);
    etRes = (TextView) findViewById (R.id.txtResult);

    calc = (Button) findViewById(R.id.btnCalc);

    calc.setOnClickListener(new View.OnClickListener() 
        @Override
        public void onClick(View view) 
            int countGrd = 0;
            float totalGrd = 0;

            if (togSci.isChecked()) 
                countGrd++;
                totalGrd = totalGrd + skSci.getProgress() + 50;
            
            if (togEng.isChecked()) 
                countGrd++;
                totalGrd = totalGrd + skEng.getProgress() + 50;
            
            if (togMath.isChecked()) 
                countGrd++;
                totalGrd = totalGrd + skMath.getProgress() + 50;
            
            if (togPro.isChecked()) 
                countGrd++;
                totalGrd = totalGrd + skPro.getProgress() + 50;
            
            if (countGrd == 0) 
                etRes.setText("Average: No Grade");
            else
                float ave = totalGrd / countGrd;
                etRes.setText("Average: "+ String.format("%.2f%%" , ave));
            
        
    );


private void seekbarLisHander() 

    skSci.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() 

        int progressChanged = 0;


        @Override
        public void onProgressChanged(SeekBar seekBar, int progress, boolean b) 
            progressChanged = progress;

        

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) 

        

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) 

            int grd = progressChanged + 50;
            etSci.setText("Science: " + grd + "%");

        
    );

    skMath.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() 

        int progressChanged = 0;

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress, boolean b) 
            progressChanged = progress + 50;
        

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) 

        

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) 

            int grd = progressChanged + 50;
            etMath.setText("Mathematics: " + grd + "%");

        
    );

    skEng.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() 

        int progressChanged = 0;

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress, boolean b) 
            progressChanged = progress;
        

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) 

        

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) 
            int grd = progressChanged + 50;
            etEng.setText("English: " + grd + "%");
        
    );

    skPro.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() 

        int progressChanged = 0;

        @Override
        public void onProgressChanged(SeekBar seekBar, int progress, boolean b) 
            progressChanged = progress;
        

        @Override
        public void onStartTrackingTouch(SeekBar seekBar) 

        

        @Override
        public void onStopTrackingTouch(SeekBar seekBar) 
            int grd = progressChanged + 50;
            etPro.setText("Programming: " + grd + "%");
        
    );

希望各位能帮帮我，提前谢谢你们

【问题讨论】：

【参考方案1】：

您已将android:max="50" 设置为SeekBar。

所以它会寻求最大值到 50。

改成android:max="100" 现在 seekbar 可以在 0 到 100 之间搜索。所以你必须为onProgressChanged 制定逻辑。

【讨论】：

android:max="50" 这是你 xml 中的内容 我需要将搜索栏启动到 50% 而不是 0% 好的，让我们说清楚。如果您从 50 开始，那么您如何期望它进一步移动，因为 max 是 50 。 ?您不能在 SEekbar 中设置锚进度。所以它总是会从 0% 移动到 100% 。只需将其设置为 0 到 100 。然后将 step 设置为 2。 还有其他方法可以让我从 50% 而不是 0% 开始吗？

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