不顯示背景。如果按鈕沒有背景，則顯示 OK<?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" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="?attr/colorBackgroundFloating" tools:context=".MainActivity" tools:layout_editor_absoluteY="25dp"> <Button android:id="@+id/button_1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerInParent="true" android:layout_weight="1" android:background="@drawable/my_round_button" android:onClick="onClick" android:text="@string/button_1" android:visibility="visible" app:layout_constraintBottom_toBottomOf="parent" app:layout_constraintEnd_toEndOf="parent" app:layout_constraintStart_toStartOf="parent" app:layout_constraintTop_toTopOf="parent" /></android.support.constraint.ConstraintLayout>當應(yīng)用程序按鈕沒有背景時，按鈕看起來像 ractanglemy_round_button<?xml version="1.0" encoding="utf-8"?><shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="ring"> <solid android:color="#FFFFFF" /></shape>怎么了？按鈕應(yīng)該看起來像戒指
3 回答
大話西游666
TA貢獻1817條經(jīng)驗 獲得超14個贊
我建議您創(chuàng)建自定義視圖，它以圓形的形式呈現(xiàn)視圖，并根據(jù)我們從布局傳遞的寬度/高度。它更有活力。
我確實喜歡Son Truong建議的答案，但這似乎不是更通用，因為我們需要硬編碼尺寸寬度/高度。
第一步：創(chuàng)建主題style.xml
<declare-styleable name="CircleCompatTextView">
<attr name="cctv_stroke_width" format="dimension" />
<attr name="cctv_background_color" format="color" />
<attr name="cctv_border_color" format="color" />
</declare-styleable>
第 2 步：創(chuàng)建自定義視圖。
public class CircleCompatTextView extends AppCompatTextView {
private final Paint paintCircle = new Paint();
private final Paint paintStroke = new Paint();
private final Resources resources;
private int strokeWidth;
private int bgColor;
private int borderColor;
private int cxCy;
public CircleCompatTextView(Context context, AttributeSet attrs) {
super(context, attrs);
resources = context.getResources();
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.CircleCompatTextView);
strokeWidth = a.getDimensionPixelSize(R.styleable.CircleCompatTextView_cctv_stroke_width, 1);
bgColor = a.getColor(R.styleable.CircleCompatTextView_cctv_background_color, resources.getColor(android.R.color.transparent));
borderColor = a.getColor(R.styleable.CircleCompatTextView_cctv_border_color, resources.getColor(android.R.color.background_dark));
a.recycle();
init();
}
private void init() {
paintCircle.setColor(bgColor);
paintCircle.setFlags(Paint.ANTI_ALIAS_FLAG);
paintStroke.setColor(borderColor);
paintStroke.setStyle(Paint.Style.STROKE);
paintStroke.setStrokeWidth(strokeWidth);
paintStroke.setFlags(Paint.ANTI_ALIAS_FLAG);
}
@Override
public void draw(Canvas canvas) {
canvas.drawCircle(cxCy, cxCy, cxCy - strokeWidth / 2, paintStroke);
canvas.drawCircle(cxCy, cxCy, cxCy - strokeWidth / 2, paintCircle);
super.draw(canvas);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
int width = getMeasuredWidth();
int height = getMeasuredHeight();
int size = ((height > width) ? height : width);
cxCy = size / 2;
setMeasuredDimension(size, size);
}
}
第三步：自定義視圖的使用
<CircleCompatTextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center|center_vertical"
android:padding="16dp"
android:textAlignment="center"
app:cctv_background_color="@android:color/transparent"
app:cctv_border_color="@android:color/background_dark"
app:cctv_stroke_width="2dp" />
這是輸出
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