Andriod【进度条加进度百分比的实现】（线程）

效果如图：

 

①：main页面布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    tools:context=".MainActivity"
    android:orientation="vertical"
    >
    <FrameLayout
        android:layout_width="match_parent"
        android:layout_height="60dp">
    <TextView
        android:id="@+id/main_tv_tv1"
        android:layout_width="60dp"
        android:layout_height="match_parent" />
    <ProgressBar
        android:id="@+id/main_pro_pro1"
        android:layout_width="match_parent"
        android:layout_height="60dp"
        style="?android:attr/progressBarStyleHorizontal"//将进度条设置为长条，默认为圆形
        android:max="100"
        />
    </FrameLayout>
    <Button
        android:id="@+id/main_btn_btn1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="setProgress"
        />
</LinearLayout>

②

线程的注意事项：

      不能在主线程中执行耗时的操作，只能在子线程中操作
      另外，在子线程中不能操作主线程中的控件(ProgressBar除外)

public class MainActivity extends AppCompatActivity {
    private ProgressBar main_pro_pro1;//进度条
    private  int progress;
    private TextView main_tv_tv1;//进度条百分比
    private MyHandler myHandler = new MyHandler();
    private  int code = 1;//线程编号
    private class MyHandler extends Handler{
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            if(code == msg.what){
                progress++;
                main_pro_pro1.setProgress(progress);
                main_tv_tv1.setText(progress+"%");
            }
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        main_pro_pro1 = this.findViewById(R.id.main_pro_pro1);
        main_tv_tv1=this.findViewById(R.id.main_tv_tv1);
    }

    public void setProgress(View view) {
        if(0 == progress){
            new MyThread().start();//触发子线程
        }

    }

    //耗时操作放在MyThread(子线程)
    private class MyThread extends Thread{
        @Override
        public void run() {
            super.run();
            while (true){
                try {
                    Thread.sleep(100);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                if(progress==100){
                    progress=0;
                    break;
                }
                Message msg = new Message();
                msg.what=1;
                myHandler.sendMessage(msg);//Handler

            }

        }
    }

}

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