1、首先在布局文件里面写普通的progressbar

<ProgressBar
        android:id="@+id/progressBar"
        style="@android:style/Widget.ProgressBar.Horizontal"
        android:layout_width="693px"
        android:layout_height="10px"
        android:indeterminate="false"
        android:max="100"
        android:progress="0"
        android:progressDrawable="@drawable/progress_shape"/>

注意的style写成horizontal，才是横向的，indeterminate是否模糊进度，为false就有精确的进度了。
最重要的是progressDrawable需要自定义drawable，代码如下：

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">

    <!--设置ProgressBar背景色-->
    <item android:id="@android:id/background">
        <shape>
            <solid android:color="#f0f0f0" />
        </shape>
    </item>

    <!--设置ProgressBar进度条颜色-->
    <item android:id="@android:id/progress">
        <scale
            android:drawable="@drawable/progress_color"
            android:scaleWidth="100%" />
    </item>

</layer-list>

引用的进度条的progress_color

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    
    <gradient
        android:angle="180"
        android:endColor="#2F74FB"
        android:startColor="#00DBFF" />
    
</shape>

activity里面就可以模拟进度了。

public class MainActivity extends AppCompatActivity {

    private ProgressBar progressBar;
    private int i = 0;
    private Handler handler = new Handler();

    private Runnable runnable = new Runnable() {
        @Override
        public void run() {
            i++;
            if (i == 100) {
                handler.removeCallbacks(this);
            }
            progressBar.setProgress(i);
            handler.postDelayed(this, 100);
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }

    private void initView() {

        progressBar = findViewById(R.id.progressBar);
        handler.postDelayed(runnable, 100);
    }

}

显示效果：录下来转个烂gif

1515047752927mzgggg.gif