Android移动开发——进度条ProgressBar

金融天下 發表於 2020-5-28 17:28:00

Android移动开发——进度条ProgressBar

<h1 style="text-align: center">Android移动开发——进度条ProgressBar</h1>
 
<h1 style="text-align: center">——木梓婕</h1>
 
1、题目要求：
实现对进度条进度变化的控制
2、效果截图：
<img src="https://img2020.cnblogs.com/blog/1920767/202005/1920767-20200528172150066-1115265665.png">
3、XML代码：
<div class="cnblogs_code">
<pre><?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=".MainActivity">

<ProgressBar
 android:id="@+id/progressBar"
 style="?android:attr/progressBarStyleHorizontal"
 android:layout_width="250dp"
 android:layout_height="wrap_content"
 android:max="200"
 android:progress="50"
 android:layout_marginTop="32dp"
 app:layout_constraintEnd_toEndOf="parent"
 app:layout_constraintStart_toStartOf="parent"
 app:layout_constraintTop_toTopOf="parent" />

<Button
 android:id="@+id/button1"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_marginTop="32dp"
 android:text="增加"
 app:layout_constraintStart_toStartOf="parent"
 app:layout_constraintTop_toBottomOf="@+id/progressBar" />

<Button
 android:id="@+id/button2"
 android:layout_width="wrap_content"
 android:layout_height="wrap_content"
 android:layout_marginTop="16dp"
 android:text="减少"
 app:layout_constraintStart_toStartOf="parent"
 app:layout_constraintTop_toBottomOf="@+id/button1" />
</androidx.constraintlayout.widget.ConstraintLayout></pre>
</div>
4、Java代码：
<div class="cnblogs_code">
<pre>package com.example.myapplication1_5;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;

public class MainActivity extends AppCompatActivity{
ProgressBar progressBar;
Button btn1,btn2;

@Override
protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 progressBar=findViewById(R.id.progressBar);
 btn1=findViewById(R.id.button1);
 btn2=findViewById(R.id.button2);
 btn1.setOnClickListener(new click1());
 btn2.setOnClickListener(new click2());

}
class click1 implements View.OnClickListener
{
 public void onClick(View v)
 {
 progressBar.incrementProgressBy(5);
 }
}
class click2 implements View.OnClickListener
{
 public void onClick(View v)
 {
 progressBar.incrementProgressBy(-5);
 }
}
}</pre>
</div>
5、补充——（使这2个按钮共用一个监听器）：
     Java代码：
<div class="cnblogs_code">
<pre>package com.example.myapplication1_5;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
ProgressBar progressBar;
Button btn1,btn2;

@Override
protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 progressBar=findViewById(R.id.progressBar);
 btn1=findViewById(R.id.button1);
 btn2=findViewById(R.id.button2);
 //btn1.setOnClickListener(new click1());
 //btn2.setOnClickListener(new click2());
 btn1.setOnClickListener(this);
 btn2.setOnClickListener(this);

}
/*class click1 implements View.OnClickListener
{
 public void onClick(View v)
 {
 progressBar.incrementProgressBy(5);
 }
}
class click2 implements View.OnClickListener
{
 public void onClick(View v)
 {
 progressBar.incrementProgressBy(-5);
 }
}*/
public void onClick(View v)
{
 switch (v.getId())
 {
 case R.id.button1:
 progressBar.incrementProgressBy(5);
 break;
 case R.id.button2:
 progressBar.incrementProgressBy(-5);
 break;
 }
}
}</pre>
</div>
  
来源：https://www.cnblogs.com/jannie/p/mzj16.html

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Android移动开发——进度条ProgressBar