本文实例为大家分享了Android Studio实现进度条效果的具体代码，供大家参考，具体内容如下
实验作业 要求一个进度条，进度随机
效果图
xml代码
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
android:orientation="vertical"
tools:context=".ProgressBarActivity">
<ProgressBar
android:id="@+id/pb_determinate"
android:layout_width="match_parent"
android:layout_height="wrap_content"
style="@android:style/Widget.ProgressBar.Horizontal"
android:backgroundTint="@color/purple_200"
android:progress="25"
android:max="100"
android:layout_centerVertical="true"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="ProgressBar"
android:textSize="28sp"
android:gravity="center"
android:layout_below="@+id/pb_determinate"
/>
</RelativeLayout>java代码
package com.example.a18101352;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.widget.ProgressBar;
import java.util.Random;
public class MainActivity extends AppCompatActivity {
private ProgressBar progressBar;
private int maxProgress;
private int currentProgress = 0;
private Handler mHandler = new Handler(){
@Override
public void handleMessage(@NonNull Message msg) {
super.handleMessage(msg);
switch (msg.what){
case 0:
progressBar.setProgress(currentProgress);
break;
}
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_progress_bar);
progressBar = findViewById(R.id.pb_determinate);
maxProgress = progressBar.getMax();
}
@Override
protected void onStart(){
super.onStart();
new Thread() {
private Random random;
@Override
public void run(){
while(true){
try {
for(int i = 0; i < maxProgress; ++i){
//间隔一秒
Thread.sleep(1000);
random = new Random();
// currentProgress += 10;
// if(currentProgress > maxProgress){
// break;
// }
//获取一个随机数给到currentProgress然后显示出来
currentProgress = random.nextInt(100);
mHandler.sendEmptyMessage(0);
}
}
catch (InterruptedException e){
e.printStackTrace();
}
}
}
}.start();
}
}线程里的for循环可以去掉，循环是测试定时加长进度条设计的。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持编程网。
