使用progressBar实现加载动画和加载进度条——小白必备（五）

关键函数

progressBar加载控件的使用

max 最大值

getProgress 进度条

indeterminate 水平进度条

package com.example.imageview;import android.os.Bundle;import android.view.View;import android.widget.ProgressBar;import androidx.appcompat.app.AppCompatActivity;public class MainActivity extends AppCompatActivity {private ProgressBar ProgressBar;private ProgressBar ProgressBar2;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);ProgressBar = findViewById(R.id.pd);ProgressBar2 = findViewById(R.id.pd2);}public void leoClick(View view) {if (ProgressBar.getVisibility() == View.GONE) {ProgressBar.setVisibility(View.VISIBLE);} else {ProgressBar.setVisibility(View.GONE);}}public void load(View view) {int progress = ProgressBar2.getProgress();progress +=10;ProgressBar2.setProgress(progress);}}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="/apk/res/android"xmlns:app="/apk/res-auto"xmlns:tools="/tools"android:layout_width="match_parent"android:layout_height="match_parent"android:orientation="vertical"tools:context=".MainActivity"><ImageViewandroid:layout_width="200dp"android:layout_height="200dp"android:src="@drawable/ic_baseline_directions_walk_24"android:scaleType="center"android:adjustViewBounds="true"/><ProgressBarandroid:id="@+id/pd"android:layout_width="wrap_content"android:layout_height="wrap_content"/><Buttonandroid:text="显示隐藏的进度条"android:layout_width="wrap_content"android:onClick="leoClick"android:layout_height="wrap_content"/><ProgressBarandroid:id="@+id/pd2"style="?android:attr/progressBarStyleHorizontal"android:max="100"android:layout_width="300dp"android:layout_height="wrap_content"/><Buttonandroid:text="模拟下载"android:onClick="load"android:layout_width="wrap_content"android:layout_height="wrap_content"/></LinearLayout>