在Android开发中如何实现好看的进度条

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activity_main.xml 

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:background="#ffffff"     android:orientation="vertical">     <LinearLayout         android:layout_width="match_parent"         android:layout_height="match_parent"         android:gravity="center"         android:orientation="vertical"         android:padding="16dp">         <TextView             android:id="@+id/textView17"             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:textSize="18sp"             android:textStyle="bold"             android:textAlignment="center"             android:text="\u00A9  itinsidenews.com" />         <LinearLayout             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:layout_margin="10dp"             android:orientation="vertical">             <TextView                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="Determinate" />             <ProgressBar                 android:id="@+id/progressDeterminate"                                  android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:indeterminate="false"                 android:max="100"                 android:progress="10" />         </LinearLayout>         <LinearLayout             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:layout_margin="10dp"             android:orientation="vertical">             <TextView                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="Indeterminate" />             <ProgressBar                 android:id="@+id/progressIndeterminate"                                  android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:indeterminate="true" />         </LinearLayout>         <LinearLayout             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:layout_margin="10dp"             android:orientation="vertical">             <TextView                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="Buffer" />             <ProgressBar                 android:id="@+id/progressBuffered"                                  android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:indeterminate="false"                 android:max="100"                 android:progress="10"                 android:secondaryProgress="20" />         </LinearLayout>         <LinearLayout             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:layout_margin="10dp"             android:orientation="vertical">             <TextView                 android:layout_width="wrap_content"                 android:layout_height="wrap_content"                 android:text="Indeterminate and Determinate" />             <ProgressBar                 android:id="@+id/progressIndeterminateDeterminate"                                  android:layout_width="match_parent"                 android:layout_height="wrap_content"                 android:indeterminate="false"                 android:max="100"                 android:progress="20" />         </LinearLayout>         <LinearLayout             android:layout_width="match_parent"             android:layout_height="wrap_content"             android:layout_margin="10dp"             android:orientation="horizontal">             <LinearLayout                 android:layout_width="0dp"                 android:layout_height="wrap_content"                 android:layout_margin="10dp"                 android:layout_weight="1"                 android:gravity="center"                 android:orientation="vertical">                 <TextView                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:layout_margin="15dp"                     android:text="Indeterminate" />                 <ProgressBar                                          android:layout_width="match_parent"                     android:layout_height="wrap_content"                     android:indeterminate="true"                    android:progressDrawable="@drawable/circular_progress_bar" />             </LinearLayout>             <LinearLayout                 android:layout_width="0dp"                 android:layout_height="match_parent"                 android:layout_margin="10dp"                 android:layout_weight="1"                 android:gravity="center"                 android:orientation="vertical">                 <TextView                     android:layout_width="wrap_content"                     android:layout_height="wrap_content"                     android:layout_margin="15dp"                     android:text="Determine" />                 <ProgressBar                     android:id="@+id/progressIndeterminateCircular"                                          android:layout_width="?attr/actionBarSize"                     android:layout_height="?attr/actionBarSize"                     android:background="@drawable/circle_shape"                     android:indeterminate="false"                     android:max="100"                     android:progress="0"                    android:progressDrawable="@drawable/circular_progress_bar" />             </LinearLayout>         </LinearLayout>     </LinearLayout> </LinearLayout>

MainActivity Java 文件代码

在MainActivity.java文件中，我们的第一步是初始化所有的进度条视图，然后编写三个void类型的函数，分别为每个进度条编写代码。 

我们在每个函数中使用了一个处理程序。在Android中，我们不能在主线程上运行长期任务；这就是我们使用处理程序的原因。处理程序允许从其他后台线程与 UI 线程进行通信。 

MainActivity.java

package com.progressbar.example.mainactivity;import android.os.Bundle; import android.os.Handler; import androidx.appcompat.app.AppCompatActivity; import androidx.appcompat.widget.Toolbar; import android.view.Menu; import android.view.MenuItem; import android.widget.ProgressBar; import android.widget.Toast; import com.progressbar.example.R; import com.progressbar.example.utils.Tools; public class MainActivity extends AppCompatActivity {     private ProgressBar progressDeterminate;     private ProgressBar progressIndeterminateCircular;     private ProgressBar progressBuffered;     private ProgressBar progressIndeterminateDeterminate;     @Override     protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);                 initComponent();     }      private void initComponent() {         progressDeterminate = (ProgressBar) findViewById(R.id.progressDeterminate);         progressIndeterminateCircular = (ProgressBar) findViewById(R.id.progressIndeterminateCircular);         progressBuffered = (ProgressBar) findViewById(R.id.progressBuffered);         progressIndeterminateDeterminate = (ProgressBar) findViewById(R.id.progressIndeterminateDeterminate);         startDeterminateProgress();         startBufferedProgress();         startBufferedSecondaryProgress();         startIndeterminateDeterminateProgress();         startDeterminateCircularProgress();     }     private void startDeterminateProgress() {         final Handler mHandler = new Handler();         Runnable runnable = new Runnable() {             public void run() {                 int progress = progressDeterminate.getProgress() + 10;                 progressDeterminate.setProgress(progress);                 if (progress > 100) {                     progressDeterminate.setProgress(0);                 }                 mHandler.postDelayed(this, 1000);

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