<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="下載"http://真正項(xiàng)目時(shí)建議將文本資源統(tǒng)一定義配置在res下的strings.xml中
android:onClick="begin"/>
</LinearLayout>

public class ProgressBarDemo extends AppCompatActivity {
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.progressbar);
}
public void begin(View v) {
//實(shí)例化進(jìn)度條對(duì)話框（ProgressDialog）
final ProgressDialog pd = new ProgressDialog(this);
pd.setTitle("請(qǐng)稍等");
//設(shè)置對(duì)話進(jìn)度條樣式為水平
pd.setProgressStyle(ProgressDialog.STYLE_HORIZONTAL);
//設(shè)置提示信息
pd.setMessage("正在玩命下載中......");
//設(shè)置對(duì)話進(jìn)度條顯示在屏幕頂部（方便截圖）
pd.getWindow().setGravity(Gravity.TOP);
pd.setMax(100);
pd.show();//調(diào)用show方法顯示進(jìn)度條對(duì)話框
//使用匿名內(nèi)部類實(shí)現(xiàn)線程并啟動(dòng)
new Thread(new Runnable() {
int initial = 0;//初始下載進(jìn)度
@Override
public void run() {
while(initial<pd.getMax()){//設(shè)置循環(huán)條件
pd.setProgress(initial+=40);//設(shè)置每次完成40
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
pd.dismiss();//進(jìn)度完成時(shí)對(duì)話框消失
}
}).start();
}
}