Android中ProgressBar的三个效果

 

 

 

先上一张界面图，如图，我要实现的效果是点击开始，进度条开始加载。点击暂停，进度条停止加载。点击继续，进度条继续加载

 

xml布局文件：

<LinearLayout android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <ProgressBar
        android:layout_gravity="center_horizontal"
        android:id="@+id/progress"
        android:layout_width="300px"
        android:layout_height="wrap_content"
        android:max="1000"
        style="?android:progressBarStyleHorizontal"
        android:layout_marginTop="50px"

    />
    

    <Button
        android:id="@+id/star"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="开始"

        android:layout_gravity="center_horizontal"
        />
    <Button
        android:id="@+id/stop"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="暂停"
        android:layout_gravity="center_horizontal"
        />
    <Button
        android:id="@+id/resume"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="继续"
        android:layout_gravity="center_horizontal"
        />

</LinearLayout>




Activity文件添加事件

package com.contentprovide.liuliu.progreessbar_demo;

import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.os.Message;

public class MainActivity extends AppCompatActivity {

    ProgressBar progress;
    int value=0;
    int scondvalue=0;
    Handler handle = new Handler();
    Button star,stop,resume;

线程，把进度条的变化效果放在里面
    Runnable run = new Runnable() {
        @Override
        public void run() {
            value+=5;
            scondvalue += 10;
            progress.setProgress(value);
            progress.setProgress(value);
            handle.postDelayed(run,200);
        }
    };




        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            progress = (ProgressBar) findViewById(R.id.progress);
            star = (Button) findViewById(R.id.star);
            stop = (Button) findViewById(R.id.stop);
            resume = (Button) findViewById(R.id.resume);

　　　　　　　　开始事件
            star.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    handle.postDelayed(run,200);//把Runable对象放进handle中，每隔200毫秒执行一次，注意：在Runable中也要放这句话

                }
            });


            stop.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    handle.removeCallbacks(run);//移除线程
                }
            });

            resume.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    handle.postDelayed(run,200);
                }
            });


        }

}