Android Studio實現進度條效果

本文實例為大傢分享瞭Android Studio實現進度條效果的具體代碼,供大傢參考,具體內容如下

實驗作業 要求一個進度條,進度隨機

效果圖

xml代碼

<?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代碼

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){
                            //間隔一秒
                            Thread.sleep(1000);
                            random = new Random();
//                            currentProgress += 10;
//                            if(currentProgress > maxProgress){
//                                break;
//                            }
                            //獲取一個隨機數給到currentProgress然後顯示出來
                            currentProgress = random.nextInt(100);
                            mHandler.sendEmptyMessage(0);
                        }
                    }
                    catch (InterruptedException e){
                        e.printStackTrace();
                    }
                }
            }
        }.start();
    }
}

線程裡的for循環可以去掉,循環是測試定時加長進度條設計的。

以上就是本文的全部內容,希望對大傢的學習有所幫助,也希望大傢多多支持WalkonNet。