Question

我正在尝试绘制一个饼图，每个弧作为单独的自定义对象。但是只显示了弧的第一个切片。 LinearLayout确实具有垂直方向，因为它已在其他帖子中建议。任何帮助将受到高度赞赏。

清单1自定义视图类（MySliceView.java）：

package com.example.piechartsample;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.RectF;
import android.provider.SyncStateContract;
import android.view.View;
import android.widget.Toast;


public class MySliceView extends View implements View.OnClickListener {
    private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
    private float[] value_degree;
    private int[] COLORS = {Color.BLUE, Color.GREEN, Color.GRAY, Color.RED, Color.CYAN};
    RectF rectf = new RectF(10, 10, 500, 500);
    float temp = 0;

    float sliceStartAngle, sliceSweepAngle;
    int sliceColor;
    RectF sliceRectf;

    public MySliceView(Context context, float[] values) {

        super(context);
        value_degree = new float[values.length];
        for (int i = 0; i < values.length; i++) {
            value_degree[i] = values[i];
        }
    }

    public MySliceView(Context context, RectF rectF, float startAngle, float sweepAngle, int color) {
        super(context);
        sliceRectf = rectF;
        sliceStartAngle = startAngle;
        sliceSweepAngle = sweepAngle;
        sliceColor = color;
        setOnClickListener(this);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        paint.setColor(sliceColor);
        canvas.drawArc(rectf, sliceStartAngle, sliceSweepAngle, true, paint);
    }


    @Override
    public void onClick(View view) {
        Toast.makeText(this.getContext(), this.getTag().toString(),
                Toast.LENGTH_SHORT).show();
    }
}

清单2布局（activity_slice_view.xml）：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/sliceViewLayout"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    >


    <TextView
        android:id="@+id/slicePieText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Slice Pie"
        />


</LinearLayout>

清单3：活动类（SliceViewActivity.java）：

package com.example.piechartsample;

import android.app.ActionBar;
import android.content.Intent;
import android.graphics.Color;
import android.graphics.RectF;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.LinearLayout;
import android.widget.Toast;
import android.widget.LinearLayout.LayoutParams;

public class SliceViewActivity extends AppCompatActivity {
    float dataValues[] = {300, 400, 100, 500, 200};
    float sweepAngle[] = new float[dataValues.length];
    float startAngle[] = new float[dataValues.length];

    private int[] colors = {Color.BLUE, Color.GREEN, Color.GRAY, Color.RED, Color.CYAN};
    RectF rectf = new RectF(10, 10, 500, 500);

    private String TAG = "SliceViewActivity";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_slice_view);
        LinearLayout linear = (LinearLayout) findViewById(R.id.sliceViewLayout);
        linear.setOrientation(LinearLayout.VERTICAL);
        calculateSweepAngle(dataValues);
        calculateStartAngle(sweepAngle);

        MySliceView slice1 = new MySliceView(this, rectf, startAngle[0], sweepAngle[0], colors[0]);
        slice1.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
        slice1.setTag("Slice1");
        linear.addView(slice1);

        MySliceView slice2 = new MySliceView(this, rectf, startAngle[1], sweepAngle[1], colors[1]);
        slice2.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
        slice2.setTag("Slice2");
        linear.addView(slice2);

    }

    private void calculateSweepAngle(float[] data) {
        // TODO Auto-generated method stub
        float total = 0;
        for (int i = 0; i < data.length; i++) {
            total += data[i];
        }
        for (int i = 0; i < data.length; i++) {
            sweepAngle[i] = 360 * (data[i] / total);
            //Log.d(TAG, "calculateSweepAngle Post Calc Data " + i + ":" + sweepAngle[i]);
        }
    }

    private void calculateStartAngle(float[] data) {
        // TODO Auto-generated method stub

        float startDegree = 0;
        for (int i = 0; i < data.length; i++) {
            if (i != 0) {
                startDegree += data[i - 1];
            }
            startAngle [i] = startDegree;
            //Log.d(TAG, "calculateStartAngle Post Calc Data " + i + ":" + startAngle[i]);
        }
    }


}

Answer 1

在第三方图书馆的帮助下很容易做到。试试吧 field

Android添加视图仅为弧添加第一个自定义视图

1 个答案: