progressbar
progressbar：ProgressBar 控件通过从左到右用一些方块填充矩形来表示一个较长操作的进度。代码如下：
<?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"> <ProgressBar style="?android:attr/progressBarStyleHorizontal" android:layout_width="match_parent" android:layout_height="wrap_content" android:id="@+id/pb_progressbar_bar" /> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tv_progressbar_num" /> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="下载" android:onClick="download" /> </LinearLayout> import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.support.annotation.Nullable; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.ProgressBar; import android.widget.TextView; /** * Created by Administrator on 2017/6/7 0007. */ public class ProgressBarActivity extends AppCompatActivity{ private ProgressBar pb_progressbar_bar; private TextView tv_progressbar_num; @Override protected void onCreate(@Nullable Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.progressbar); pb_progressbar_bar= (ProgressBar) findViewById(R.id.pb_progressbar_bar); tv_progressbar_num= (TextView) findViewById(R.id.tv_progressbar_num); } public void download(View view){ new MyThread().start(); } Handler handler=new Handler(){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); int i=msg.what; tv_progressbar_num.setText(i+""); } }; class MyThread extends Thread{ @Override public void run() { super.run(); for (int i = 0; i <=100 ; i++) { pb_progressbar_bar.setProgress(i); handler.sendEmptyMessage(i); try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } } } } } 如下图所示：
