android:id="@+id/progress_bar" style="?android:attr/progressBarStyleHorizontal" android:max="100" android:layout_width="match_parent" android:layout_height="wrap_content" />style：默认为转圈的圆形运动。
max：默认为100.
设置可见性：
public class MainActivity extends AppCompatActivity { ProgressBar progressBar; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button button = (Button) findViewById(R.id.button); progressBar = (ProgressBar) findViewById(R.id.progress_bar); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { if (progressBar.getVisibility() == View.GONE) { progressBar.setVisibility(View.VISIBLE); } else { progressBar.setVisibility(View.GONE); } } }); }}所有控件都有visibility属性，值为：visible, invisible, gone，分别表示为：可见，不可见保留位置，不可见不保留位置。
设置值：
public class MainActivity extends AppCompatActivity { ProgressBar progressBar; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Button button = (Button) findViewById(R.id.button); progressBar = (ProgressBar) findViewById(R.id.progress_bar); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { int progress = progressBar.getProgress(); progress = progress + 10; progressBar.setProgress(progress); } }); }}
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