一、要求:
ui界面: progressbar、按钮
功能: 默认ProgressBar不显示、按下按钮时显示菊花动画加载
二、素材:
图片:
(将该图片存放至drawable下)
三、源码:
①布局界面:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<ProgressBar
android:id="@+id/progressBar"
style="?android:attr/progressBarStyle"
android:layout_width="236dp"
android:layout_height="169dp"
android:layout_marginTop="50dp"
android:indeterminateDrawable="@drawable/juhuadonghua"
android:visibility="invisible"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/button"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:text="Button"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@id/progressBar" />
</androidx.constraintlayout.widget.ConstraintLayout>
②动画代码:
<?xml version="1.0" encoding="utf-8"?>
<animated-rotate xmlns:android="http://schemas.android.com/apk/res/android"
android:drawable="@drawable/jh"
android:fromDegrees="0.0"
android:pivotX="50%"
android:pivotY="50%"
android:toDegrees="360.0"/>
(注:该xml文件存于drawable文件下)
这样一来,就可以在布局界面的progressbar控件下添加属性 :(xxxx处为动画文件名)
android:indeterminateDrawable="@drawable/xxxxx"
③Java代码:
import androidx.appcompat.app.AppCompatActivity;
public class MainActivity extends AppCompatActivity {
private ProgressBar pgload;
private Button btnload;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final ProgressBar pgload = (ProgressBar) findViewById(R.id.progressBar);
final Button btnload = (Button) findViewById(R.id.button);
btnload.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
pgload.setVisibility(View.VISIBLE);
}
});
}
}