问题
I have a custom view named as HorizontalScaleView
public class HorizontalScaleView extends View {
private static float THICK_STROKE_WIDTH = 16.0f;
private static float THIN_STROKE_WIDTH = 8.0f;
private static float THINNER_STROKE_WIDTH = 4.0f;
private int mColorStartGradient;
private int mColorEndGradient;
private int mColorOptimum;
private int mColorLineGradientStart;
private int mColorLineGradientEnd;
private int mColorDarkerGrey;
private int mMaxOptimumValue = 1000;
private Paint mLinePaint;
private Paint mTargetPaint;
private int mWidth;
private int mHeight;
private int markerValue = 0;
private int targetValue = 700;
private int averageValue = -1;
private Drawable mMarkerDrawable;
private Drawable mTargetDrawable;
private Rect markerRect = new Rect();
private Rect targetRect = new Rect();
public HorizontalScaleView(Context context) {
super(context);
mColorStartGradient = ContextCompat.getColor(context, R.color.colorBackGradientStart);
mColorEndGradient = ContextCompat.getColor(context, R.color.score_maintain);
mColorOptimum = ContextCompat.getColor(context, R.color.score_maintain);
mColorDarkerGrey = ContextCompat.getColor(context, R.color.textColorDarkGrey);
init(context);
}
public HorizontalScaleView(Context context, @Nullable AttributeSet attrs) {
super(context, attrs);
TypedArray attributes = context.getTheme().obtainStyledAttributes(
attrs,
R.styleable.HorizontalScaleView,
0, 0);
try {
mColorStartGradient = attributes.getColor(R.styleable.HorizontalScaleView_color_back_gradient_start,
ContextCompat.getColor(context, R.color.colorBackGradientStart));
mColorEndGradient = attributes.getColor(R.styleable.HorizontalScaleView_color_back_gradient_end,
ContextCompat.getColor(context, R.color.score_maintain));
mColorOptimum = attributes.getColor(R.styleable.HorizontalScaleView_color_optimum,
ContextCompat.getColor(context, R.color.score_maintain));
mColorLineGradientStart = attributes.getColor(R.styleable.HorizontalScaleView_color_gradient_start,
ContextCompat.getColor(context, R.color.line_gradient_start));
mColorLineGradientEnd = attributes.getColor(R.styleable.HorizontalScaleView_color_gradient_end,
ContextCompat.getColor(context, R.color.line_gradient_end));
mColorDarkerGrey = attributes.getColor(R.styleable.HorizontalScaleView_color_marker,
ContextCompat.getColor(context, R.color.textColorDarkGrey));
mMaxOptimumValue = attributes.getInteger(R.styleable.HorizontalScaleView_max_optimum_value,
1000);
targetValue = attributes.getInteger(R.styleable.HorizontalScaleView_target_value,
0);
averageValue = attributes.getInteger(R.styleable.HorizontalScaleView_average_value,
-1);
} finally {
attributes.recycle();
}
init(context);
}
private void init(Context context) {
mLinePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mLinePaint.setStrokeWidth(THINNER_STROKE_WIDTH);
mTargetPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mTargetPaint.setStrokeWidth(THINNER_STROKE_WIDTH);
mTargetPaint.setColor(ContextCompat.getColor(context, android.R.color.black));
mMarkerDrawable = context.getDrawable(R.drawable.ic_marker);
mTargetDrawable = context.getDrawable(R.drawable.ic_arrow_drop_up_black);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
mWidth = MeasureSpec.getSize(widthMeasureSpec);
mHeight = MeasureSpec.getSize(heightMeasureSpec);
setMeasuredDimension(mWidth, mHeight);
}
@SuppressLint("DrawAllocation")
@Override
protected void onDraw(Canvas canvas) {
canvas.save();
mWidth = getWidth();
int gap = (mHeight * 10) / 100;
int sidePadding = 2 * gap;
mWidth -= 2 * sidePadding;
mLinePaint.setTextSize((mHeight * 15) / 100);
mTargetPaint.setTextSize((mHeight * 15) / 100);
float optimumStopX = mWidth + sidePadding;
THIN_STROKE_WIDTH = (mHeight * 25) / 1000;
THINNER_STROKE_WIDTH = (mHeight * 15) / 1000;
Shader shader = new LinearGradient(sidePadding, mHeight / 2, optimumStopX, mHeight / 2,
mColorLineGradientStart, mColorLineGradientEnd, Shader.TileMode.CLAMP);
mLinePaint.setShader(shader);
mLinePaint.setStrokeWidth(mHeight * 4 / 100);
canvas.drawLine(sidePadding, mHeight * 32 / 100, optimumStopX, mHeight * 32 / 100, mLinePaint);
mLinePaint.setShader(null);
//Drawing background Gradient
int gradientHeight = (mHeight * 16) / 100;
shader = new LinearGradient(0, gradientHeight, mWidth + sidePadding + THIN_STROKE_WIDTH, gradientHeight,
mColorStartGradient, mColorEndGradient, Shader.TileMode.CLAMP);
mLinePaint.setShader(shader);
mLinePaint.setStrokeWidth(mHeight * 32 / 100);
mLinePaint.setAlpha(30);
canvas.drawLine(0, gradientHeight, mWidth + sidePadding + THIN_STROKE_WIDTH, gradientHeight, mLinePaint);
mLinePaint.setShader(null);
int borderLineHeight = (mHeight * 5) / 100;
mLinePaint.setAlpha(0);
mLinePaint.setStrokeWidth(THIN_STROKE_WIDTH);
mLinePaint.setColor(mColorLineGradientEnd);
canvas.drawLine(optimumStopX, (mHeight * 32 / 100) - borderLineHeight, optimumStopX, (mHeight * 32 / 100) + borderLineHeight, mLinePaint);
mLinePaint.setColor(mColorLineGradientStart);
canvas.drawLine(sidePadding, (mHeight * 32 / 100) - borderLineHeight, sidePadding, (mHeight * 32 / 100) + borderLineHeight, mLinePaint);
// Drawing Grade i.e 0 ' 100 ' 200 ' 300 ....... 1000
int gradeWidth = (int) ((optimumStopX - sidePadding) / 10);
int gradePositionX = sidePadding;
int gradePositionY = (mHeight * 44) / 100;
int gradeHeight = (mHeight * 3) / 100;
int gradeTextHeight = (mHeight * 58) / 100;
mLinePaint.setStrokeWidth(THIN_STROKE_WIDTH);
mLinePaint.setTextSize((mHeight * 10) / 100);
canvas.drawText("0", gradePositionX, gradeTextHeight, mLinePaint);
for (int index = 1; index < 10; index++) {
gradePositionX += gradeWidth;
if (index % 2 == 0) {
mLinePaint.setStrokeWidth(THIN_STROKE_WIDTH);
canvas.drawLine(gradePositionX, gradePositionY - gradeHeight, gradePositionX,
gradePositionY + gradeHeight, mLinePaint);
if ((index * 100) != targetValue) {
mLinePaint.setStrokeWidth(THIN_STROKE_WIDTH);
canvas.drawText(String.valueOf(index * 100), gradePositionX - ((mHeight * 8) / 100), gradeTextHeight, mLinePaint);
}
} else {
mLinePaint.setStrokeWidth(THINNER_STROKE_WIDTH);
canvas.drawLine(gradePositionX, gradePositionY - gradeHeight, gradePositionX,
gradePositionY + gradeHeight, mLinePaint);
}
}
canvas.drawText("1000", optimumStopX - ((mHeight * 22) / 100), gradeTextHeight, mLinePaint);
//Drawing Current Position
int markerPositionX = (int) (((optimumStopX - sidePadding) / mMaxOptimumValue) * markerValue);
markerPositionX += sidePadding;
int markerPositionY = mHeight * 34 / 100;
int markerWidth = (mHeight * 5 / 100);
int markerHeight = (mHeight * 65 / 1000);
mMarkerDrawable.setTint(mColorDarkerGrey);
markerRect.set(markerPositionX - 2 * markerWidth, markerPositionY - (5 * markerHeight),
markerPositionX + 2 * markerWidth, markerPositionY - markerHeight);
mMarkerDrawable.setBounds(markerRect);
mMarkerDrawable.draw(canvas);
canvas.restore();
//Drawing Target Position
if (targetValue <= 0) {
return;
}
mTargetPaint.setColor(mColorOptimum);
mTargetPaint.setStrokeWidth(THIN_STROKE_WIDTH);
mTargetPaint.setTextSize(mHeight * 18 / 100);
int targetPositionX = (int) (((optimumStopX - sidePadding) / mMaxOptimumValue) * targetValue);
int targetPositionY = mHeight * 58 / 100;
targetPositionX += sidePadding;
int targetWidth = (mHeight * 5 / 100);
int targetHeight = (mHeight * 4 / 100);
targetRect.set(targetPositionX - 2 * targetWidth, targetPositionY - targetHeight,
targetPositionX + 2 * targetWidth, targetPositionY + (4 * targetHeight));
mTargetDrawable.setTint(mColorOptimum);
mTargetDrawable.setBounds(targetRect);
mTargetDrawable.draw(canvas);
canvas.drawText(String.valueOf(targetValue), targetPositionX - (mHeight * 15 / 100), (mHeight * 82) / 100, mTargetPaint);
mTargetPaint.setTextSize(mHeight * 10 / 100);
canvas.drawText("Target", targetPositionX - (mHeight * 14 / 100), (mHeight * 95) / 100, mTargetPaint);
//Drawing Average Value
if (averageValue <= 0) {
return;
}
mTargetPaint.setColor(mColorDarkerGrey);
mTargetPaint.setStrokeWidth(THIN_STROKE_WIDTH);
mTargetPaint.setTextSize(mHeight * 18 / 100);
int averageValuePosition = (int) (((optimumStopX - sidePadding) / mMaxOptimumValue) * averageValue);
averageValuePosition += sidePadding;
targetRect.set(averageValuePosition - 2 * targetWidth, targetPositionY - targetHeight,
averageValuePosition + 2 * targetWidth, targetPositionY + (4 * targetHeight));
mTargetDrawable.setBounds(targetRect);
mTargetDrawable.draw(canvas);
canvas.drawText(String.valueOf(averageValue), averageValuePosition - 65, (mHeight * 82) / 100, mTargetPaint);
mTargetPaint.setTextSize(mHeight * 10 / 100);
canvas.drawText("Average", averageValuePosition - 70, (mHeight * 95) / 100, mTargetPaint);
mTargetPaint.setColorFilter(null);
}
public void setMarkerValue(int markerValue) {
this.markerValue = markerValue;
invalidate();
requestLayout();
}
public void setTargetValue(int targetValue) {
this.targetValue = targetValue;
invalidate();
requestLayout();
}
}
I used it in one of my layout files:
<?xml version="1.0" encoding="utf-8"?>
<layout 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">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@android:color/white"
android:orientation="vertical">
<TextView
android:id="@+id/score_card_desc"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="16dp"
android:layout_marginTop="12dp"
android:layout_marginRight="16dp"
android:text="@string/dashboard_household_score_card_desc"
android:textColor="@color/textColorDarkGrey"
android:textSize="14sp" />
<TextView
android:id="@+id/score_card_score"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/score_card_desc"
android:layout_marginLeft="16dp"
android:layout_marginTop="-8dp"
android:layout_marginRight="16dp"
android:layout_marginBottom="-8dp"
android:fontFamily="sans-serif-light"
android:textColor="@color/textColorDarkGrey"
android:textSize="100sp"
tools:text="655" />
<com.kroger.mobile.components.HorizontalScaleView
android:id="@+id/score_card_graph"
style="@style/HorizontalScaleView"
android:layout_width="400dp"
android:layout_height="120dp"
android:layout_below="@+id/score_card_score"
android:layout_centerHorizontal="true"
android:layout_marginLeft="4dp"
android:layout_marginRight="4dp"
app:max_optimum_value="1000"
app:target_value="@integer/dashboard_target" />
</RelativeLayout>
</layout>
Now I want to take screenshot of this layout programmatically without displaying it on the screen and then and share it
I use these functions to generate, store and share screenshot respectively
private Bitmap generateScreenShot(Household household) {
LayoutDashboardScreenShotBinding shareBinding =
DataBindingUtil.inflate(LayoutInflater.from(getContext()), R.layout.layout_dashboard_screen_shot, null, false);
shareBinding.scoreCardScore.setText(String.valueOf(household.overallScore));
shareBinding.scoreCardGraph.setMarkerValue(household.overallScore);
shareBinding.scoreCardGraph.setTargetValue(0);
View shareView = shareBinding.getRoot();
shareView.measure(MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED),
MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED));
shareView.layout(0, 0, shareView.getMeasuredWidth(), shareView.getMeasuredHeight());
Bitmap bitmap = Bitmap.createBitmap(shareView.getWidth(), shareView.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
shareView.draw(canvas);
return bitmap;
}
public File storeScreenShot(Bitmap bm, String fileName){
String dirPath = Environment.getExternalStorageDirectory().getAbsolutePath() + DIRECTORY_PATH;
File dir = new File(dirPath);
if(dir.exists() || dir.mkdirs()) {
File file = new File(dirPath, fileName);
try {
FileOutputStream fileOutputStream = new FileOutputStream(file);
bm.compress(Bitmap.CompressFormat.PNG, 100, fileOutputStream);
fileOutputStream.flush();
fileOutputStream.close();
return file;
} catch (Exception e) {
e.printStackTrace();
}
}
return null;
}
private void shareImage(File file){
Context context = getContext();
if(context == null){
return;
}
Uri uri = FileProvider.getUriForFile(context,
context.getApplicationContext().getPackageName() + ".provider", file);
Intent intent = new Intent();
intent.setAction(Intent.ACTION_SEND);
intent.setType("image/*");
intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
intent.putExtra(android.content.Intent.EXTRA_SUBJECT, "");
intent.putExtra(android.content.Intent.EXTRA_TEXT, "");
intent.putExtra(Intent.EXTRA_STREAM, uri);
try {
startActivity(Intent.createChooser(intent, "Share Screenshot"));
} catch (ActivityNotFoundException e) {
Toast.makeText(context, "No App Available", Toast.LENGTH_SHORT).show();
}
}
What I expect to capture in that screenshot is:
But what I am getting is:
The custom view that I have in this layout is not showing up on the screenshot.
回答1:
Maybe HorizontalScaleView.setMeasuredDimensions() is getting called with 0,0 because you did not handle the case of MeasureSpecs like UNSPECIFIED, which would have a getSize() of 0 :)
来源：https://stackoverflow.com/questions/53181261/custom-view-component-is-not-showing-up-on-the-screenshot