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

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">

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"

/>

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"

/>

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(){

/**

* Subclasses must implement this to receive messages.

*

* @param msg

*/

@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脚本之家。