1.直接拖取 将Progressbar拖入虚拟机里面就会在XML里自动生成控件代码
注：ProgressBar有两个第一个是圆形进度条 第二个是水平进度条（我们今天学习的是水平进度条（Horizontal））
自动生成图中框框区域的内容
android:progress="0" 是进度条的初始值
[插入]
转到对应的Java类中
根据对应的ID实例化出相应的控件
XML代码
<?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"> <LinearLayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical"> <!--android:progress 初始值--> <ProgressBar android:id="@+id/progressBar" style="?android:attr/progressBarStyleHorizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:progress="0"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tv_main_text"/> <Button android:id="@+id/bu_main_Button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:onClick="download" android:text="下载"/> </LinearLayout></LinearLayout>
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Java代码
public class MainActivity extends AppCompatActivity { //下载 点击按钮 private Button bu; //文本 private TextView text; //进度条 private ProgressBar pb; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.actitvity_main); pb = (ProgressBar) findViewById(R.id.progressBar); bu = (Button) findViewById(R.id.bu_main_Button); text = (TextView) findViewById(R.id.tv_main_text); } public void download(View view){ new My().start(); } Handler hand=new Handler(){ @Override public void handleMessage(Message msg) { int i=msg.what; text.setText(i+"%"); } }; class My extends Thread{ @Override public void run() { for (int i = 1; i <= 100; i++) { pb.setProgress(i); hand.sendEmptyMessage(i); try { Thread.sleep(10); } catch (InterruptedException e) { e.printStackTrace(); } } } }
