Android入门之ProgressBar的使用教程

<?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"
    android:orientation="vertical"
    tools:context=".MainActivity">
 
    <Button
        android:id="@+id/displayBtn"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="显示/隐藏效果演示"
        android:textSize="20sp" />
 
    <ProgressBar
        android:id="@+id/pgBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center" />
 
    <ProgressBar
        android:id="@+id/pgBarHorizontal"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:max="100" />
    <TextView
        android:id="@+id/pgValueTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="" />
 
</LinearLayout>

package org.mk.android.demo.demoprogressbar;
 
import androidx.appcompat.app.AppCompatActivity;
 
import android.view.View;
import android.os.Bundle;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;
 
public class MainActivity extends AppCompatActivity {
    private ProgressBar btnProgressBar;
    private ProgressBar pgStyleHorizontal;
    private TextView txtPgValueShow;
 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        txtPgValueShow = (TextView) findViewById(R.id.pgValueTextView);
        //横向进度条，点一下加5
        pgStyleHorizontal = (ProgressBar) findViewById(R.id.pgBarHorizontal);
        pgStyleHorizontal.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                switch (v.getId()) {
                    case R.id.pgBarHorizontal:
                        //每点击一次按钮就可以获取进度条当前的进度
                        int progress = pgStyleHorizontal.getProgress();
                        progress = progress + 5;
                        pgStyleHorizontal.setProgress(progress);
                        StringBuffer currentValue = new StringBuffer();
                        currentValue.append("当前进度为: ").append(String.valueOf(progress));
                        txtPgValueShow.setText(currentValue.toString());
                        break;
                    default:
                        break;
                }
            }
        });
        //点一下显示点一下隐藏圆形进度条
 
        Button button = (Button) findViewById(R.id.displayBtn);
        btnProgressBar = (ProgressBar) findViewById(R.id.pgBar);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                switch (v.getId()) {
                    case R.id.displayBtn:
                        if (btnProgressBar.getVisibility() == View.GONE) {
                            btnProgressBar.setVisibility(View.VISIBLE);
                        } else {
                            btnProgressBar.setVisibility(View.GONE);
                        }
                        break;
                    default:
                        break;
                }
            }
        });
    }
}