Zi 字媒體

ProgressBar pb1; pb1 = (ProgressBar) findViewById(R.id.pb1); pb1.setVisibility(progress<100? View.VISIBLE:View.GONE); pb1.setProgress(progress);   示範 XML xml version="1.0" encoding="utf-8"?> <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/layout" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_alignParentBottom="true" android:layout_alignParentEnd="true" android:layout_alignParentRight="true" > <ProgressBar android:id="@+id/pb1" style="?android:attr/progressBarStyle" android:layout_width="wrap_content" android:layout_height="wrap_content" android:alpha="0.5" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> <ProgressBar android:id="@+id/pb2" style="?android:attr/progressBarStyleHorizontal" android:layout_width="191dp" android:layout_height="19dp" android:layout_marginEnd="168dp" android:layout_marginStart="168dp" android:layout_marginTop="8dp" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toBottomOf="@+id/pb1" /> <Button android:id="@+id/b1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginBottom="8dp" android:layout_marginEnd="8dp" android:layout_marginLeft="8dp" android:layout_marginRight="8dp" android:layout_marginStart="8dp" android:layout_marginTop="8dp" android:onClick="add" android:text="增加進度條" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /> android.support.constraint.ConstraintLayout> JAVA public class MainActivity extends AppCompatActivity { ProgressBar pb1, pb2; int progress = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); pb1 = (ProgressBar) findViewById(R.id.pb1); pb2 = (ProgressBar) findViewById(R.id.pb2); } public void add(View v){ progress+=10; pb2.setVisibility(progress<100? View.VISIBLE:View.GONE); pb2.setProgress(progress); pb1.setVisibility(progress<100? View.VISIBLE:View.GONE); pb1.setProgress(progress); } }   展示 相關文章: [Android] Android 學習總集