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Android實現(xiàn)儀表盤控件開發(fā)

更新時間：2021年05月27日 10:50:05 作者：Unbeaten East

這篇文章主要為大家詳細(xì)介紹了Android實現(xiàn)儀表盤控件開發(fā)，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價值，感興趣的小伙伴們可以參考一下

儀表盤在工業(yè)軟件中很常見，今天整一個圖片式儀表盤控件（非幾何圖形繪制）。實現(xiàn)非常簡單，一張背景圖，一張指針。創(chuàng)建一個RelativeLayout布局文件，然后在里面布置好控件的位置，代碼如下

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content">
    <ImageView
        android:id="@+id/id_dial"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:src="@mipmap/meter_h_bk" />
    <ImageView
        android:id="@+id/id_dial_point"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@id/id_dial"
        android:layout_centerInParent="true"
        android:src="@mipmap/meter_fr" />
    <com.tech.view.DigitalText
        android:id="@+id/id_value"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@id/id_dial"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="2dp"
        android:text="29.9"
        android:textColor="@android:color/white"
        android:textSize="21sp" />
</RelativeLayout>

DigitalText是使用第三方字體控件，這個可自行百度搜索想要的字體。然后寫一個儀表盤控件類，DialBoard

代碼如下

public class DialBoard {
    private static final String TAG = DialBoard.class.getName();
    private ImageView dialPoint;
    private TextView text;
    private static final float MAX = 120.0f;
    private static final float MIN = -120.0f;
    private boolean animationDone = true;
    public DialBoard(Activity activity) {
        dialPoint = activity.findViewById(R.id.id_dial_point);
        text = activity.findViewById(R.id.id_value);
        text.setText(String.format("%.02f", 0.0f));
        setRotation(MIN, true);
    }
    public synchronized void moveTo(float progress) {
        if (animationDone) new Thread(() -> move(progress)).start();
    }
    private void move(float progress) {
        animationDone = false;
        float offset = (MAX - MIN) / 100;
        final float STEP = 2.0f;//理論上要小于offset
        float curProgress = (dialPoint.getRotation() - MIN) / offset;
        //計算當(dāng)前進(jìn)度和目標(biāo)進(jìn)度方向，步數(shù)
        float value = Math.abs(curProgress - progress);
        while (value > 0.1f) {
            value = (value < 1.0f ? 0.2f : STEP);
            if (progress < curProgress) value = -value;
            setRotation(dialPoint.getRotation() + value, false);
            Tools.sleep(10);
            curProgress = (dialPoint.getRotation() - MIN) / offset;
            value = Math.abs(curProgress - progress);
            final float textValue = curProgress;
            text.post(() -> text.setText(String.format("%.02f", textValue)));
        }
        text.post(() -> text.setText(String.format("%.02f", progress)));
        animationDone = true;
    }
    /**
     * @param rotation MIN~MAX
     */
    public void setRotation(float rotation) {
        this.setRotation(rotation, false);
    }
    private void setRotation(float rotation, boolean onCreate) {
        if (onCreate) {
            int w = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
            int h = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
            dialPoint.measure(w, h);//測量控件大小
        }
        int width = dialPoint.getMeasuredWidth();
        int height = dialPoint.getMeasuredHeight();
        dialPoint.post(() -> {
            dialPoint.setPivotX(width * 0.5f);
            dialPoint.setPivotY(height * 0.82666f);
            dialPoint.setRotation(rotation);
        });
    }
}

最終效果圖