[移动开发]5、Android--ProgressBar基础学习

学习视频：https://www.bilibili.com/video/BV1Ng411K7YP?p=15

属性

1. android:max;进度条的最大值
2. android:min;进度条的最小值
3. android:progress:进度条已完成进度值
4. androidindterminate:如果设置成true,则进度条不精确显示进度
5. tyle="?android:attr/progressBarStyleHorizontal"水平进度条
6. progressDrawable：设置进度条的背景
7. secondaryProgress：第二进度条，类似看视频的缓存

示例

layout/activity_progress_bar.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".ProgressBarActivity">
    <ProgressBar
        android:id="@+id/pb_one"
        android:layout_width="100dp"
        android:layout_height="100dp"
        />
    <Button
        android:id="@+id/pb_btn_one"
        android:text="进度条测试"
        android:onClick="ShowAndHideProgressBar"
        android:layout_width="200dp"
        android:layout_height="50dp"
        />
    <ProgressBar
        android:id="@+id/pb_two"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:max="100"
        style="?android:attr/progressBarStyleHorizontal"
        android:progress="25"
        android:secondaryProgress="50"
        />
    <Button
        android:id="@+id/pb_btn_two"
        android:text="进度条测试"
        android:onClick="SetProgressBar"
        android:layout_width="200dp"
        android:layout_height="50dp"
        />
    <ProgressBar
        android:id="@+id/pb_three"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:indeterminate="true"
        style="?android:attr/progressBarStyleHorizontal"
        />

</LinearLayout>

com.pha.frist/ProgressBarActivity.java

package com.pha.first;

import androidx.appcompat.app.AppCompatActivity;

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

public class ProgressBarActivity extends AppCompatActivity {
    private ProgressBar pb_one,pb_two;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_progress_bar);
        pb_one=findViewById(R.id.pb_one);
        pb_two = findViewById(R.id.pb_two);
    }

    public void ShowAndHideProgressBar(View view) {
        //显示时点击隐藏，隐藏时点击显示
        if(pb_one.getVisibility()==View.GONE){
            pb_one.setVisibility(View.VISIBLE);
        }else{
            pb_one.setVisibility(View.GONE);
        }
    }

    public void SetProgressBar(View view) {
        int prog = pb_two.getProgress();
        int prog2 = pb_two.getSecondaryProgress();
        prog = prog + 10;
        prog2 = prog2 +13;
        pb_two.setProgress(prog);
        pb_two.setSecondaryProgress(prog2);

    }
}

效果图

第一个进度条：时刻旋转
第二进度条：分三种颜色,可以看出第一进度和第二进度
第三进度条:水平进度条，不显示精确进度。进度时刻滑动

知识点

1. java获取当前进程：pb_two.getProgress()
2. java获取当前第二进程：pb_two.getSecondaryProgress()
3. java当前进程赋值：pb_two.setProgress()
4. java当前第二进程赋值：pb_two.setSecondaryProgress()
5. 获取显示是否显示 ：getVisibility()
6. 控制显示是否显示 ：setVisibility()
7. 显示/隐藏：View.GONE / View.VISIBLE